Pub Date : 2026-01-01DOI: 10.1016/j.ceramint.2025.12.069
Juanrong Chen , Yue shen , Junjie Ma , Chaozhong Sun , Sai Zhang , Sisi Xiao , Yingguan Xiao , Shunsheng Cao
Although BiOBr exhibits a good photodegradation activity for organic pollutants due to its special layered structure, low visible-light utilization and insufficiently exposed active sites limit its photocatalytic efficiency. To address these challenges, we construct TiO2@BiOBr (HTBB) photocatalyst by coupling hollow spherical structure and p-n heterojunction. The strong built-in electric field can boost efficient charge separation, while hollow spherical structure not only can provide abundant accessible active sites due to its unique two-sided available interfaces, but also can promote light absorption through multiple reflection mechanism. As a result, the degradation rate of levofloxacin (LVFX) over HTBB photocatalyst is as high as 96.25 % under visible light within 1 h and still maintains a high level (>90 %) after five successive cycles. Meanwhile, the photocatalytic performance of HTBB shows excellent harsh environment tolerance. Therefore, this work provides a new insight for constructing BiOBr-based hollow spherical photocatalysts for the treatment of antibiotic wastewater.
{"title":"Morphology-controlled self-assembly of hollow spherical heterostructured TiO2@BiOBr promotes visible-light degradation of antibiotic pollutants","authors":"Juanrong Chen , Yue shen , Junjie Ma , Chaozhong Sun , Sai Zhang , Sisi Xiao , Yingguan Xiao , Shunsheng Cao","doi":"10.1016/j.ceramint.2025.12.069","DOIUrl":"10.1016/j.ceramint.2025.12.069","url":null,"abstract":"<div><div>Although BiOBr exhibits a good photodegradation activity for organic pollutants due to its special layered structure, low visible-light utilization and insufficiently exposed active sites limit its photocatalytic efficiency. To address these challenges, we construct TiO<sub>2</sub>@BiOBr (HTBB) photocatalyst by coupling hollow spherical structure and p-n heterojunction. The strong built-in electric field can boost efficient charge separation, while hollow spherical structure not only can provide abundant accessible active sites due to its unique two-sided available interfaces, but also can promote light absorption through multiple reflection mechanism. As a result, the degradation rate of levofloxacin (LVFX) over HTBB photocatalyst is as high as 96.25 % under visible light within 1 h and still maintains a high level (>90 %) after five successive cycles. Meanwhile, the photocatalytic performance of HTBB shows excellent harsh environment tolerance. Therefore, this work provides a new insight for constructing BiOBr-based hollow spherical photocatalysts for the treatment of antibiotic wastewater.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 2","pages":"Pages 2529-2536"},"PeriodicalIF":5.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.ceramint.2025.12.051
Samia Aydi , Mouhamed Mounir Bouzayeni , Iskandar Chaabane , Noweir Ahmad Alghamdi , Regis Barille , Abderrazek Oueslati
The development of multifunctional oxide ceramics for advanced energy-storage and optoelectronic applications motivates the investigation of doped LaNbO4 systems. In this work, La0.92Sr0.08NbO4-δ (LSNO) and La0.92Ca0.08NbO4-δ (LCNO) ceramics were synthesized via a conventional solid-state reaction route and thoroughly characterized. X-ray diffraction confirmed that both compositions crystallize in a monoclinic P21/C fergusonite-type structure, indicating effective incorporation of Sr2+ and Ca2+ at the La site. Dielectric measurements revealed a giant dielectric constant (ε′ ≈ 105) with very low dielectric loss (tan δ), demonstrating strong potential for high energy density capacitor applications. AC conductivity (σac) and impedance studies indicated thermally activated conduction, with a mechanism transitioning from non-overlapping small polaron tunneling (NSPT) at low temperatures to correlated barrier hopping (CBH) at elevated temperatures. Optical analyses showed a decrease in the band gap from 4.33eV (LSNO) to 4.12 eV (LCNO), enhancing light absorption and enabling tunable optoelectronic properties. The synergistic improvements in structural stability, dielectric performance, electrical conductivity, and optical functionality establish LSNO and LCNO ceramics as promising candidates for next-generation capacitors, semiconducting devices, and multifunctional optoelectronic applications.
用于先进储能和光电子应用的多功能氧化物陶瓷的发展激发了掺杂LaNbO4体系的研究。本文采用常规固相反应制备了La0.92Sr0.08NbO4-δ (LSNO)和La0.92Ca0.08NbO4-δ (LCNO)陶瓷，并对其进行了表征。x射线衍射证实，这两种成分结晶为单斜P21/C弗格森型结构，表明Sr2+和Ca2+在La位点有效结合。电介质测量结果表明，该电容器具有巨大的介电常数（ε′≈105）和极低的介电损耗（tan δ），具有很强的高能量密度电容器应用潜力。交流电导率（σac）和阻抗研究表明，该材料的热激活传导机制由低温下的非重叠小极化子隧穿（NSPT）向高温下的相关势垒跳变（CBH）转变。光学分析表明，带隙从4.33eV （LSNO）减小到4.12 eV (llcno)，增强了光吸收并实现了可调谐的光电性能。在结构稳定性、介电性能、电导率和光学功能方面的协同改进使LSNO和LCNO陶瓷成为下一代电容器、半导体器件和多功能光电应用的有前途的候选者。
{"title":"Enhanced structural, dielectric, electrical, and optical properties of Ca2+/Sr2+ doped LaNbO4 ceramics","authors":"Samia Aydi , Mouhamed Mounir Bouzayeni , Iskandar Chaabane , Noweir Ahmad Alghamdi , Regis Barille , Abderrazek Oueslati","doi":"10.1016/j.ceramint.2025.12.051","DOIUrl":"10.1016/j.ceramint.2025.12.051","url":null,"abstract":"<div><div>The development of multifunctional oxide ceramics for advanced energy-storage and optoelectronic applications motivates the investigation of doped LaNbO<sub>4</sub> systems. In this work, La<sub>0.92</sub>Sr<sub>0.08</sub>NbO<sub>4-δ</sub> (LSNO) and La<sub>0.92</sub>Ca<sub>0.08</sub>NbO<sub>4-δ</sub> (LCNO) ceramics were synthesized via a conventional solid-state reaction route and thoroughly characterized. X-ray diffraction confirmed that both compositions crystallize in a monoclinic P2<sub>1</sub>/C fergusonite-type structure, indicating effective incorporation of Sr<sup>2+</sup> and Ca<sup>2+</sup> at the La site. Dielectric measurements revealed a giant dielectric constant (<em>ε</em>′ ≈ 10<sup>5</sup>) with very low dielectric loss (tan δ), demonstrating strong potential for high energy density capacitor applications. AC conductivity (σ<sub>ac</sub>) and impedance studies indicated thermally activated conduction, with a mechanism transitioning from non-overlapping small polaron tunneling (NSPT) at low temperatures to correlated barrier hopping (CBH) at elevated temperatures. Optical analyses showed a decrease in the band gap from 4.33eV (LSNO) to 4.12 eV (LCNO), enhancing light absorption and enabling tunable optoelectronic properties. The synergistic improvements in structural stability, dielectric performance, electrical conductivity, and optical functionality establish LSNO and LCNO ceramics as promising candidates for next-generation capacitors, semiconducting devices, and multifunctional optoelectronic applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 2","pages":"Pages 2314-2331"},"PeriodicalIF":5.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.ceramint.2025.11.324
Gang Qi , Ruoyu Chen , Zhanmin Wang , Haichuan Wang , Chuanyang Cai , Minghui Li , Saisai Li , Canhua Li
Seasonal environmental conditions affect the temperature of raw materials, as well as preparation, and curing processes, thereby influencing the rheological behavior of porous ceramic slurries, the foaming process, and the final properties of the ceramics. In this study, gradient porous ceramics were prepared using silica fume by the direct foaming method under simulated seasonal temperatures, and the effect of working temperature on the rheology and foaming behavior of the slurry was investigated. The results showed that environmental temperature significantly influenced the rheological behavior, pore structure, and final properties of gradient porous ceramics. At 25 °C, the slurry exhibited the lowest viscosity (23,750 mPa s) and yield stress (30.2 Pa), while at 45 °C, viscosity and yield stress increased to 65,000 mPa s and 100.54 Pa, respectively. Solidification time was also prolonged from 6.5 h to 42.5 h with increasing temperature. These changes led to notable differences in pore size and distribution. Gradient structures were successfully formed at 15, 25, and 45 °C, whereas the sample at 35 °C showed irregular, disordered pores. Consequently, the samples fabricated at 15, 25, and 45 °C displayed gradient variations in apparent porosity, bulk density, and thermal conductivity. Specifically, the sample prepared at 25 °C exhibited the lowest total apparent porosity of 71.6 %, a bulk density of 0.50 g/cm3, and the lowest thermal conductivity ranging from 0.124 to 0.114 W/(m·K). The flexural strength in two directions measured 1.11 MPa and 1.03 MPa, while the corresponding compressive strength reached 2.95 MPa and 3.34 MPa, respectively. This study provides valuable insights into fabricating gradient porous ceramics via direct foaming under varying seasonal conditions.
{"title":"Tailoring gradient porous ceramics via direct foaming: the role of seasonal temperature in slurry rheology and microstructure development","authors":"Gang Qi , Ruoyu Chen , Zhanmin Wang , Haichuan Wang , Chuanyang Cai , Minghui Li , Saisai Li , Canhua Li","doi":"10.1016/j.ceramint.2025.11.324","DOIUrl":"10.1016/j.ceramint.2025.11.324","url":null,"abstract":"<div><div>Seasonal environmental conditions affect the temperature of raw materials, as well as preparation, and curing processes, thereby influencing the rheological behavior of porous ceramic slurries, the foaming process, and the final properties of the ceramics. In this study, gradient porous ceramics were prepared using silica fume by the direct foaming method under simulated seasonal temperatures, and the effect of working temperature on the rheology and foaming behavior of the slurry was investigated. The results showed that environmental temperature significantly influenced the rheological behavior, pore structure, and final properties of gradient porous ceramics. At 25 °C, the slurry exhibited the lowest viscosity (23,750 mPa s) and yield stress (30.2 Pa), while at 45 °C, viscosity and yield stress increased to 65,000 mPa s and 100.54 Pa, respectively. Solidification time was also prolonged from 6.5 h to 42.5 h with increasing temperature. These changes led to notable differences in pore size and distribution. Gradient structures were successfully formed at 15, 25, and 45 °C, whereas the sample at 35 °C showed irregular, disordered pores. Consequently, the samples fabricated at 15, 25, and 45 °C displayed gradient variations in apparent porosity, bulk density, and thermal conductivity. Specifically, the sample prepared at 25 °C exhibited the lowest total apparent porosity of 71.6 %, a bulk density of 0.50 g/cm<sup>3</sup>, and the lowest thermal conductivity ranging from 0.124 to 0.114 W/(m·K). The flexural strength in two directions measured 1.11 MPa and 1.03 MPa, while the corresponding compressive strength reached 2.95 MPa and 3.34 MPa, respectively. This study provides valuable insights into fabricating gradient porous ceramics via direct foaming under varying seasonal conditions.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 2","pages":"Pages 1564-1573"},"PeriodicalIF":5.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.ceramint.2025.11.339
Xueying Wang , Yaoyao Luo , Kai Luo , Shao Kang , Shaobo Si , Ge Tang , Lei Wang , Zhenkang Zhang , Huaiwu Zhang
Magnetic and microstructural properties of NiCuZn ferrites are strongly dependent on sintering temperature, which strongly affects their performance in high-frequency applications. In this study, NiCuZn ferrite ceramics were prepared by the solid-phase reaction method, and the influence of sintering temperature on phase composition, grain growth, and magnetic behavior was investigated based on it as an independent variable. At the proper sintering temperature of 920 °C, a single-phase spinel structure with homogeneous grain morphology and high densification was obtained. Simultaneously, initial permeability (μ) increased obviously from 157.62 to 547.01, and the saturation magnetization (4πMs) reached 3339.94 Gauss. Meanwhile, the ferromagnetic resonance linewidth (ΔH) decreased greatly from 643.56 to 229.02 Oe, which reflected that the magnetic loss was reduced from the ferromagnetic resonance experiment. The optimized magnetic properties and improved dielectric characteristics suggest that NiCuZn ferrites sintered at 920 °C have the potential application in high-performance microstrip antenna substrates. Microstrip antennas based on ferrite-based substrates were simulated, and return loss and radiation characteristics were analyzed. The results show that when the magnetic bias condition is proper, with relatively high permittivity (ε′) and permeability (μ) of ferrite, the antenna can be miniaturized significantly. In addition, by reasonably designing the geometry of the antenna, the radiation characteristics of the antenna can be tuned to achieve the great performance of the whole antenna.
{"title":"Effect of sintering temperature on the microstructure, magnetic, and dielectric properties of NiCuZn ferrites for microstrip antenna applications","authors":"Xueying Wang , Yaoyao Luo , Kai Luo , Shao Kang , Shaobo Si , Ge Tang , Lei Wang , Zhenkang Zhang , Huaiwu Zhang","doi":"10.1016/j.ceramint.2025.11.339","DOIUrl":"10.1016/j.ceramint.2025.11.339","url":null,"abstract":"<div><div>Magnetic and microstructural properties of NiCuZn ferrites are strongly dependent on sintering temperature, which strongly affects their performance in high-frequency applications. In this study, NiCuZn ferrite ceramics were prepared by the solid-phase reaction method, and the influence of sintering temperature on phase composition, grain growth, and magnetic behavior was investigated based on it as an independent variable. At the proper sintering temperature of 920 °C, a single-phase spinel structure with homogeneous grain morphology and high densification was obtained. Simultaneously, initial permeability (<em>μ</em>) increased obviously from 157.62 to 547.01, and the saturation magnetization (<em>4πMs</em>) reached 3339.94 Gauss. Meanwhile, the ferromagnetic resonance linewidth (Δ<em>H</em>) decreased greatly from 643.56 to 229.02 Oe, which reflected that the magnetic loss was reduced from the ferromagnetic resonance experiment. The optimized magnetic properties and improved dielectric characteristics suggest that NiCuZn ferrites sintered at 920 °C have the potential application in high-performance microstrip antenna substrates. Microstrip antennas based on ferrite-based substrates were simulated, and return loss and radiation characteristics were analyzed. The results show that when the magnetic bias condition is proper, with relatively high permittivity (<em>ε′</em>) and permeability (<em>μ</em>) of ferrite, the antenna can be miniaturized significantly. In addition, by reasonably designing the geometry of the antenna, the radiation characteristics of the antenna can be tuned to achieve the great performance of the whole antenna.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 2","pages":"Pages 1589-1599"},"PeriodicalIF":5.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cd1–3x/2SmxCu3Ti4O12 ceramics (x = 0, 0.025, and 0.05) were synthesized using a conventional solid-state reaction method, and all sintered samples exhibited the main CdCu3Ti4O12 phase. The addition of Sm3+ refined the grain size and produced a dense microstructure after sintering at 1000 °C for 3 h. The sample with x = 0.025 exhibited the best dielectric performance, with a high permittivity of 1.23 × 105, a low loss tangent of 0.090, and good thermal stability. The improved dielectric response is attributed to enhanced grain boundary resistance, which suppresses leakage conduction. Impedance spectroscopy and X-ray photoelectron spectroscopy confirm that oxygen vacancies generated during sintering are mainly localized within grain interiors, thereby promoting the formation of an internal barrier layer capacitor structure responsible for the giant dielectric permittivity. First-principles calculations revealed that Sm3+ preferentially substitutes at the Cd2+ site with minimal structural distortion, maintaining lattice stability. Oxygen vacancies preferentially form away from Sm3+ dopants and act as electron donors, thereby reducing Cu2+ to Cu+ and Ti4+ to Ti3+ via charge compensation. These processes promote hopping conduction and strengthen the dielectric response. The combined experimental and theoretical results demonstrate that both oxygen vacancy formation and microstructures critically govern the dielectric behavior of Sm3+-doped CdCu3Ti4O12, highlighting the effectiveness of Sm3+ doping in tailoring the microstructure and electrical properties for high-permittivity dielectric applications.
{"title":"Synergistic experimental and first-principles insights into Sm3+ incorporation and dielectric performance of CdCu3Ti4O12 ceramics","authors":"Sirawit Promsai , Atittaya Changchuea , Jakkree Boonlakhorn , Udomsilp Pinsook , Pornjuk Srepusharawoot","doi":"10.1016/j.ceramint.2025.12.160","DOIUrl":"10.1016/j.ceramint.2025.12.160","url":null,"abstract":"<div><div>Cd<sub>1–3<em>x</em>/2</sub>Sm<sub><em>x</em></sub>Cu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> ceramics (<em>x</em> = 0, 0.025, and 0.05) were synthesized using a conventional solid-state reaction method, and all sintered samples exhibited the main CdCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> phase. The addition of Sm<sup>3+</sup> refined the grain size and produced a dense microstructure after sintering at 1000 °C for 3 h. The sample with <em>x</em> = 0.025 exhibited the best dielectric performance, with a high permittivity of 1.23 × 10<sup>5</sup>, a low loss tangent of 0.090, and good thermal stability. The improved dielectric response is attributed to enhanced grain boundary resistance, which suppresses leakage conduction. Impedance spectroscopy and X-ray photoelectron spectroscopy confirm that oxygen vacancies generated during sintering are mainly localized within grain interiors, thereby promoting the formation of an internal barrier layer capacitor structure responsible for the giant dielectric permittivity. First-principles calculations revealed that Sm<sup>3+</sup> preferentially substitutes at the Cd<sup>2+</sup> site with minimal structural distortion, maintaining lattice stability. Oxygen vacancies preferentially form away from Sm<sup>3+</sup> dopants and act as electron donors, thereby reducing Cu<sup>2+</sup> to Cu<sup>+</sup> and Ti<sup>4+</sup> to Ti<sup>3+</sup> via charge compensation. These processes promote hopping conduction and strengthen the dielectric response. The combined experimental and theoretical results demonstrate that both oxygen vacancy formation and microstructures critically govern the dielectric behavior of Sm<sup>3+</sup>-doped CdCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub>, highlighting the effectiveness of Sm<sup>3+</sup> doping in tailoring the microstructure and electrical properties for high-permittivity dielectric applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 3","pages":"Pages 3681-3693"},"PeriodicalIF":5.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145996113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.ceramint.2025.12.163
Ziyi Fang , Xu Liang , Meilin Fu , Xiangjia Sun , Jiao Liu , Zhiheng Zong , Zhaoping Chen , Jian Xu , Xiaojuan Liang , Weidong Xiang
The field of solid-state laser illumination is developing rapidly. Phosphor-in-glass film (PiF) has been proved to be a promising color-conversion material for high-quality laser illumination due to their excellent chromatic properties, tunability, and simple fabrication process. However, conventional fabrication methods that fix the phosphor layer directly onto small-sized therally conductive substrate struggle to simultaneously achieve both high luminous flux and high luminous efficiency. In this study, Ce:YAG PiF@Coating film (PiF@CF) was obtained by coating Ta2O5 composite film on the surface of sapphire substrate which was not coated with phosphor layer through a unique coating film design. The coated Ce:YAG PiF@CF achieves synergistic optimization of luminous efficiency (LE) and luminous flux (LF). While achieving a laser performance of 243.63 lm/W peak LE and holding 1641 lm @ 8.32 W, which is twice that of the uncoated Ce:YAG PiF (824.63 lm). In addition, the sample maintains an excellent thermal conductivity of 12.92 W/(m K) at 573 K. This study provides a new solution for high-power laser illumination fluorescence conversion materials that take into account the three aspects of luminous efficiency, luminous flux and heat dissipation performance through the coating process, laying an important foundation for its application in the fields of lighting and display.
{"title":"A unique coating film architecture makes Ce:YAG sapphire films suitable for high-power laser-driven lighting","authors":"Ziyi Fang , Xu Liang , Meilin Fu , Xiangjia Sun , Jiao Liu , Zhiheng Zong , Zhaoping Chen , Jian Xu , Xiaojuan Liang , Weidong Xiang","doi":"10.1016/j.ceramint.2025.12.163","DOIUrl":"10.1016/j.ceramint.2025.12.163","url":null,"abstract":"<div><div>The field of solid-state laser illumination is developing rapidly. Phosphor-in-glass film (PiF) has been proved to be a promising color-conversion material for high-quality laser illumination due to their excellent chromatic properties, tunability, and simple fabrication process. However, conventional fabrication methods that fix the phosphor layer directly onto small-sized therally conductive substrate struggle to simultaneously achieve both high luminous flux and high luminous efficiency. In this study, Ce:YAG PiF@Coating film (PiF@CF) was obtained by coating Ta<sub>2</sub>O<sub>5</sub> composite film on the surface of sapphire substrate which was not coated with phosphor layer through a unique coating film design. The coated Ce:YAG PiF@CF achieves synergistic optimization of luminous efficiency (LE) and luminous flux (LF). While achieving a laser performance of 243.63 lm/W peak LE and holding 1641 lm @ 8.32 W, which is twice that of the uncoated Ce:YAG PiF (824.63 lm). In addition, the sample maintains an excellent thermal conductivity of 12.92 W/(m K) at 573 K. This study provides a new solution for high-power laser illumination fluorescence conversion materials that take into account the three aspects of luminous efficiency, luminous flux and heat dissipation performance through the coating process, laying an important foundation for its application in the fields of lighting and display.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 3","pages":"Pages 3702-3710"},"PeriodicalIF":5.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145996152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.ceramint.2025.12.164
Qingzhi Ma , Renhao Hu , Xuechao Liu , Xuhua Lu , Jian Chen , Rulin Zhang , Yunzhou Xue , Shaolong He , Ying Wang , Lianyi Xu , Min Jin , Rongbin Li , Pan Gao
Silicon carbide (SiC) coatings are critical for protecting graphite substrates in high-performance applications, such as semiconductor manufacturing and aerospace, where extreme thermal and chemical environments demand robust adhesion and durability. This study investigates the temperature-driven microstructural evolution of SiC coatings deposited on graphite by chemical vapor deposition (CVD) at 1260 °C, 1280 °C, and 1320 °C, elucidating the mechanism of their impact on interfacial adhesion. Advanced analytical techniques, including field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), white-light confocal microscopy, nanoindentation, and scratch testing, were employed to characterize the coatings. The results show that when the deposition temperature increases from 1260 °C to 1320 °C, the SiC coating grain aggregate transforms from an irregular structure to a truncated polyhedron structure, and the (111) surface texture coefficient increases significantly. Additionally, the SiC grain aggregates are relatively loose at low temperatures, whereas they form a continuous and dense fused structure at high temperatures. XPS analysis shows that with increasing temperature, the Si-C bond density increases and the stacking faults decrease, thereby enhancing the bonding strength between the coating and the substrate. It is worth noting that the critical bonding force increases from 20.8 N at 1260 °C to 28.5 N at 1320 °C, which is consistent with the increase in nanohardness. These findings highlight that within the studied 1260–1320 °C range, increasing the deposition temperature significantly improves the microstructure and adhesion of SiC coatings.
{"title":"Interfacial adhesion of CVD-SiC coatings on graphite substrates: Role of temperature in microstructure and mechanical properties","authors":"Qingzhi Ma , Renhao Hu , Xuechao Liu , Xuhua Lu , Jian Chen , Rulin Zhang , Yunzhou Xue , Shaolong He , Ying Wang , Lianyi Xu , Min Jin , Rongbin Li , Pan Gao","doi":"10.1016/j.ceramint.2025.12.164","DOIUrl":"10.1016/j.ceramint.2025.12.164","url":null,"abstract":"<div><div>Silicon carbide (SiC) coatings are critical for protecting graphite substrates in high-performance applications, such as semiconductor manufacturing and aerospace, where extreme thermal and chemical environments demand robust adhesion and durability. This study investigates the temperature-driven microstructural evolution of SiC coatings deposited on graphite by chemical vapor deposition (CVD) at 1260 °C, 1280 °C, and 1320 °C, elucidating the mechanism of their impact on interfacial adhesion. Advanced analytical techniques, including field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), white-light confocal microscopy, nanoindentation, and scratch testing, were employed to characterize the coatings. The results show that when the deposition temperature increases from 1260 °C to 1320 °C, the SiC coating grain aggregate transforms from an irregular structure to a truncated polyhedron structure, and the (111) surface texture coefficient increases significantly. Additionally, the SiC grain aggregates are relatively loose at low temperatures, whereas they form a continuous and dense fused structure at high temperatures. XPS analysis shows that with increasing temperature, the Si-C bond density increases and the stacking faults decrease, thereby enhancing the bonding strength between the coating and the substrate. It is worth noting that the critical bonding force increases from 20.8 N at 1260 °C to 28.5 N at 1320 °C, which is consistent with the increase in nanohardness. These findings highlight that within the studied 1260–1320 °C range, increasing the deposition temperature significantly improves the microstructure and adhesion of SiC coatings.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 3","pages":"Pages 3711-3718"},"PeriodicalIF":5.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145996153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.ceramint.2025.12.168
Kaili Song , Shasha Yang , Minghui Chen , Dongbiao Li , Xiaoyue Zhang , Gang Wang , Fuhui Wang
While traditional high-temperature self-lubricating composites with various solid lubricants demonstrate adequate tribological performance under mild conditions, they inherently suffer from two critical applied limitations: (i) competing trade-offs between tribological and mechanical properties, and (ii) accelerated oxidation arising from lubricant-derived oxidative voiding and cracks. Herein, we propose a new design philosophy for high-temperature self-lubricating alloys that strategically eliminates solid lubricant additions. Through oxidation regulation to customize oxide debris, a hard glaze layer is in situ formed on the wear surface at early stage of high-temperature friction, which provides enhanced tribological performances. This concept is realized by introducing merely 3 wt% Re into a CoCrWSi alloy (CCWS-3Re). It induces the transformation of oxide debris from CoO to the low-melting-point oxide of Co3O4. The low melting point and high atomic diffusion rate of Co3O4 promote sintering of wear debris and accelerate the formation of glaze layer. Comparing to the Re-free alloy, CCWS-3Re alloy exhibits a 97.5 % reduction in wear rate, accompanied by a 25 % decrease in friction coefficient under 800 °C sliding conditions. Since no solid lubricants are added, CCWS-3Re possesses a high yield strength of 470 MPa, meanwhile high oxidation resistance with a remarkable low parabolic rate constant of 1.24 × 10−4 mg2cm4h−1 at 800 °C.
{"title":"Customizing oxide debris of CoCrW alloy by adding Re to improve tribological properties while maintaining high mechanical strength and oxidation resistance","authors":"Kaili Song , Shasha Yang , Minghui Chen , Dongbiao Li , Xiaoyue Zhang , Gang Wang , Fuhui Wang","doi":"10.1016/j.ceramint.2025.12.168","DOIUrl":"10.1016/j.ceramint.2025.12.168","url":null,"abstract":"<div><div>While traditional high-temperature self-lubricating composites with various solid lubricants demonstrate adequate tribological performance under mild conditions, they inherently suffer from two critical applied limitations: (i) competing trade-offs between tribological and mechanical properties, and (ii) accelerated oxidation arising from lubricant-derived oxidative voiding and cracks. Herein, we propose a new design philosophy for high-temperature self-lubricating alloys that strategically eliminates solid lubricant additions. Through oxidation regulation to customize oxide debris, a hard glaze layer is <em>in situ</em> formed on the wear surface at early stage of high-temperature friction, which provides enhanced tribological performances. This concept is realized by introducing merely 3 wt% Re into a CoCrWSi alloy (CCWS-3Re). It induces the transformation of oxide debris from CoO to the low-melting-point oxide of Co<sub>3</sub>O<sub>4</sub>. The low melting point and high atomic diffusion rate of Co<sub>3</sub>O<sub>4</sub> promote sintering of wear debris and accelerate the formation of glaze layer. Comparing to the Re-free alloy, CCWS-3Re alloy exhibits a 97.5 % reduction in wear rate, accompanied by a 25 % decrease in friction coefficient under 800 °C sliding conditions. Since no solid lubricants are added, CCWS-3Re possesses a high yield strength of 470 MPa, meanwhile high oxidation resistance with a remarkable low parabolic rate constant of 1.24 × 10<sup>−4</sup> mg<sup>2</sup>cm<sup>4</sup>h<sup>−1</sup> at 800 °C.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 3","pages":"Pages 3758-3769"},"PeriodicalIF":5.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145996157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.ceramint.2025.12.170
Hong Shen , Hengfeng Yang , Yingbo Feng , Quan Xu
This study investigates the damage to ceramic substrates caused by ultrafast laser pulses during metal coating removal and explores the causes of color changes induced by varying laser energy intensities. EDS reveals no significant differences in elemental ratios between laser-processed and pristine surfaces after laser processing. However, high-energy laser irradiation alters the crystal structure. The laser-induced thermal effect results in the broadening of Raman spectral peaks and the disappearance of X-ray diffraction (XRD) peaks, indicating that the ceramic undergoes remelting and amorphization. This remelting process leads to the loss of the original microstructure, which consequently causes a decline in the ceramic's piezoelectric performance and frequency selectivity. The findings provide a theoretical foundation for the optimization of ultrafast laser processing to reduce thermal damage to ceramic substrates and to control discoloration.
{"title":"Study on damage in ultrafast laser ablation of CaTiO3-MgTiO3 ceramic","authors":"Hong Shen , Hengfeng Yang , Yingbo Feng , Quan Xu","doi":"10.1016/j.ceramint.2025.12.170","DOIUrl":"10.1016/j.ceramint.2025.12.170","url":null,"abstract":"<div><div>This study investigates the damage to ceramic substrates caused by ultrafast laser pulses during metal coating removal and explores the causes of color changes induced by varying laser energy intensities. EDS reveals no significant differences in elemental ratios between laser-processed and pristine surfaces after laser processing. However, high-energy laser irradiation alters the crystal structure. The laser-induced thermal effect results in the broadening of Raman spectral peaks and the disappearance of X-ray diffraction (XRD) peaks, indicating that the ceramic undergoes remelting and amorphization. This remelting process leads to the loss of the original microstructure, which consequently causes a decline in the ceramic's piezoelectric performance and frequency selectivity. The findings provide a theoretical foundation for the optimization of ultrafast laser processing to reduce thermal damage to ceramic substrates and to control discoloration.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 3","pages":"Pages 3787-3795"},"PeriodicalIF":5.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145996160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.ceramint.2025.12.152
Jelena Vukmirović , Ivan Stijepović , Bojan Miljević , Danica Piper , Paweł Pęczkowski , Piotr Zachariasz , Sara Joksović , Vladimir V. Srdić
Different lanthanum manganite-based thin films were prepared by polymer assisted deposition (PAD) and spin coating on the monocrystal SrTiO3 (001) and Si substrates, whereas double-layered film was obtained by combining PAD and sol-gel method to deposit second perovskite Ba0.7Sr0.3TiO3 layer. Valence states of ions were probed by X-ray absorption spectroscopy (XAS) at the SOLARIS National Synchrotron Radiation Centre in Kraków, Poland. It was found that manganese valence depends on substrate type, doping level, and BSTO buffer layer which is important to obtain single-phase complex oxide thin films.
{"title":"Dependence of the Mn valence state in complex oxide thin films derived from lanthanum manganite","authors":"Jelena Vukmirović , Ivan Stijepović , Bojan Miljević , Danica Piper , Paweł Pęczkowski , Piotr Zachariasz , Sara Joksović , Vladimir V. Srdić","doi":"10.1016/j.ceramint.2025.12.152","DOIUrl":"10.1016/j.ceramint.2025.12.152","url":null,"abstract":"<div><div>Different lanthanum manganite-based thin films were prepared by polymer assisted deposition (PAD) and spin coating on the monocrystal SrTiO<sub>3</sub> (001) and Si substrates, whereas double-layered film was obtained by combining PAD and sol-gel method to deposit second perovskite Ba<sub>0.7</sub>Sr<sub>0.3</sub>TiO<sub>3</sub> layer. Valence states of ions were probed by X-ray absorption spectroscopy (XAS) at the SOLARIS National Synchrotron Radiation Centre in Kraków, Poland. It was found that manganese valence depends on substrate type, doping level, and BSTO buffer layer which is important to obtain single-phase complex oxide thin films.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 3","pages":"Pages 3608-3614"},"PeriodicalIF":5.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145996162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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