Journal of The European Ceramic Society最新文献

英文中文

Novel high-entropy cordierite ceramics with both electromagnetic wave absorption and infrared radiation properties via one-step sintering

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-11 DOI: 10.1016/j.jeurceramsoc.2025.117203

Wenjie Yue, Hongchen Qiu, Shuhan Zhu, Hailiang Wang, Mingliang Li, Jinpeng Zhu, Gang Shao, Hailong Wang, Hongliang Xu, Hongxia Lu

Cordierite is widely used in high-temperature kilns and infrared heating because of its high infrared emissivity. In this study, high-entropy cordierite ceramics were prepared by a one-step sintering process, which extended the other properties of cordierite while reducing the sintering temperature. The phase composition, microstructure, electromagnetic wave absorption properties, and infrared radiation properties of high-entropy cordierite ceramics were investigated successively. The results show that by selecting several common oxides doped in equal amounts and holding the ceramics at 1100 °C for three hours, high-entropy cordierite ceramics (Mg_0.25Fe_0.25Mn_0.25Zr_0.25)₂(Al_0.5Ti_0.5)₄Si₅O₁₈ can be synthesized, and the sintering temperature of which is 200 °C lower than that of conventional cordierite. Compared with cordierite, without wave-absorbing properties, the magnetic oxides, oxygen vacancies, and pores in the high-entropy samples lead to magnetic and dielectric losses, resulting in a minimum reflection loss of −38.21 dB at 4.88 GHz, accompanied by an effective absorption bandwidth (EAB) of 2.56 GHz at a thickness of 4.70 mm. Meanwhile, due to the lattice vibrations and dipole moment changes caused by lattice distortion, the prepared high-entropy cordierite ceramics maintain a high infrared radiation (IR) emissivity above 0.85 at 8–14 μm wavelengths. In addition, MgO, Al₂O₃, SiO₂, and ZrO₂ formed a low eutectic mixture during the sintering process, which reduced the sintering temperature of high-entropy cordierite ceramics. This work is of great significance for expanding the application areas and improving the sintering properties of cordierite ceramics.

{"title":"Novel high-entropy cordierite ceramics with both electromagnetic wave absorption and infrared radiation properties via one-step sintering","authors":"Wenjie Yue, Hongchen Qiu, Shuhan Zhu, Hailiang Wang, Mingliang Li, Jinpeng Zhu, Gang Shao, Hailong Wang, Hongliang Xu, Hongxia Lu","doi":"10.1016/j.jeurceramsoc.2025.117203","DOIUrl":"10.1016/j.jeurceramsoc.2025.117203","url":null,"abstract":"<div><div>Cordierite is widely used in high-temperature kilns and infrared heating because of its high infrared emissivity. In this study, high-entropy cordierite ceramics were prepared by a one-step sintering process, which extended the other properties of cordierite while reducing the sintering temperature. The phase composition, microstructure, electromagnetic wave absorption properties, and infrared radiation properties of high-entropy cordierite ceramics were investigated successively. The results show that by selecting several common oxides doped in equal amounts and holding the ceramics at 1100 °C for three hours, high-entropy cordierite ceramics (Mg0.25Fe0.25Mn0.25Zr0.25)2(Al0.5Ti0.5)4Si5O18 can be synthesized, and the sintering temperature of which is 200 °C lower than that of conventional cordierite. Compared with cordierite, without wave-absorbing properties, the magnetic oxides, oxygen vacancies, and pores in the high-entropy samples lead to magnetic and dielectric losses, resulting in a minimum reflection loss of −38.21 dB at 4.88 GHz, accompanied by an effective absorption bandwidth (EAB) of 2.56 GHz at a thickness of 4.70 mm. Meanwhile, due to the lattice vibrations and dipole moment changes caused by lattice distortion, the prepared high-entropy cordierite ceramics maintain a high infrared radiation (IR) emissivity above 0.85 at 8–14 μm wavelengths. In addition, MgO, Al2O3, SiO2, and ZrO2 formed a low eutectic mixture during the sintering process, which reduced the sintering temperature of high-entropy cordierite ceramics. This work is of great significance for expanding the application areas and improving the sintering properties of cordierite ceramics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117203"},"PeriodicalIF":5.8,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156534","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}

引用次数: 0

Investigation of dielectric and flexoelectric properties of chemically gradient BaxSr(1-x)TiO3 ceramics

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-11 DOI: 10.1016/j.jeurceramsoc.2025.117201

Haolong He , Jun Liu , Hongwei Wang , Hongguang Liu , Kai Bi

The rapid evolution of electronic devices has increased the emphasis on optimizing the electromechanical responses of lead-free ceramic materials. Recently, flexoelectricity in ceramic materials has garnered significant interest due to its potential applications. Doping is a key strategy for optimizing the dielectric properties of materials, but research on the tailoring of strain gradients across materials should not be neglected. To address this, we prepared cast films of Ba_0.7Sr_0.3TiO₃, Ba_0.8Sr_0.2TiO₃, and Ba_0.9Sr_0.1TiO₃ by adjusting the ratio of barium to strontium. These films were stacked in the thickness direction and sintered to create a compositional gradient, to obtain ceramic sheets with enhanced properties. The gradient ceramic sheets exhibited a low dielectric temperature coefficient, demonstrating excellent temperature stability, alongside a pre-existing strain gradient that enhanced the ceramic flexoelectric coefficient to 54.48 μC·m⁻¹. Compared to single-component barium strontium titanate ceramics, this improvement makes gradient ceramics more advantageous for electronic device applications.

{"title":"Investigation of dielectric and flexoelectric properties of chemically gradient BaxSr(1-x)TiO3 ceramics","authors":"Haolong He , Jun Liu , Hongwei Wang , Hongguang Liu , Kai Bi","doi":"10.1016/j.jeurceramsoc.2025.117201","DOIUrl":"10.1016/j.jeurceramsoc.2025.117201","url":null,"abstract":"<div><div>The rapid evolution of electronic devices has increased the emphasis on optimizing the electromechanical responses of lead-free ceramic materials. Recently, flexoelectricity in ceramic materials has garnered significant interest due to its potential applications. Doping is a key strategy for optimizing the dielectric properties of materials, but research on the tailoring of strain gradients across materials should not be neglected. To address this, we prepared cast films of Ba0.7Sr0.3TiO3, Ba0.8Sr0.2TiO3, and Ba0.9Sr0.1TiO3 by adjusting the ratio of barium to strontium. These films were stacked in the thickness direction and sintered to create a compositional gradient, to obtain ceramic sheets with enhanced properties. The gradient ceramic sheets exhibited a low dielectric temperature coefficient, demonstrating excellent temperature stability, alongside a pre-existing strain gradient that enhanced the ceramic flexoelectric coefficient to 54.48 μC·m−1. Compared to single-component barium strontium titanate ceramics, this improvement makes gradient ceramics more advantageous for electronic device applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117201"},"PeriodicalIF":5.8,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156922","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}

引用次数: 0

Optimization of the phase composition and structure of LaB6 modified ZrB2-SiC multiphase powders synthesized by sol-gel and boro/carbothermal reduction method

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-10 DOI: 10.1016/j.jeurceramsoc.2025.117202

Zhe Zhou , Dawang Xia , Zhi Li , Jisi Wu , Bin Chen , Man Li , Xun Ma , Hongxian Chen

In this study, ultrafine ZrB₂-SiC-LaB₆ multiphase powders were synthesized using a combination of sol-gel and boro/carbothermal reduction methods. The microstructure of multiphase powders was investigated for the effects of heat-treatment temperature, water and carbon source content. The results showed that the optimum conditions for the preparation of uniformly dispersed ZrB₂-SiC-LaB₆ multiphase powders with a diameter of about 300 nm were as follows: the heat-treatment temperature was 1500 °C,

n_{H_{2} O}

: n_Glu= 30:1, and n_Glu: (n_Zr+n_Si+n_B+n_La+n_Glu)= 0.24:1. The multiphase grains consisted of eutectic structures formed between the ZrB₂ phase and either the LaB₆ phase or the LaBO₃ phase. Further, the addition of 2.5 wt% graphite led to a large number of rod-like grains in eutectic structures, which was attributed to the high concentration of C or CO atmosphere coupled with the direction of the stable hot gas flow. The formation of multiphase grains is due to the presence of unstable hexagonal crystal system La₂O₃ in the liquid phase, which forms a eutectic structure with ZrB₂ grains of the same crystal system and reacts with B₂O₃ to form the more stable LaBO₃ or LaB₆ phase. This study provides a theoretical foundation and experimental basis for the application of ZrB₂-SiC-LaB₆ multiphase powders.

{"title":"Optimization of the phase composition and structure of LaB6 modified ZrB2-SiC multiphase powders synthesized by sol-gel and boro/carbothermal reduction method","authors":"Zhe Zhou , Dawang Xia , Zhi Li , Jisi Wu , Bin Chen , Man Li , Xun Ma , Hongxian Chen","doi":"10.1016/j.jeurceramsoc.2025.117202","DOIUrl":"10.1016/j.jeurceramsoc.2025.117202","url":null,"abstract":"<div><div>In this study, ultrafine ZrB2-SiC-LaB6 multiphase powders were synthesized using a combination of sol-gel and boro/carbothermal reduction methods. The microstructure of multiphase powders was investigated for the effects of heat-treatment temperature, water and carbon source content. The results showed that the optimum conditions for the preparation of uniformly dispersed ZrB2-SiC-LaB6 multiphase powders with a diameter of about 300 nm were as follows: the heat-treatment temperature was 1500 °C, <math><msub><mrow><mi>n</mi></mrow><mrow><msub><mrow><mi>H</mi></mrow><mrow><mn>2</mn></mrow></msub><mi>O</mi></mrow></msub></math>: nGlu= 30:1, and nGlu: (nZr+nSi+nB+nLa+nGlu)= 0.24:1. The multiphase grains consisted of eutectic structures formed between the ZrB2 phase and either the LaB6 phase or the LaBO3 phase. Further, the addition of 2.5 wt% graphite led to a large number of rod-like grains in eutectic structures, which was attributed to the high concentration of C or CO atmosphere coupled with the direction of the stable hot gas flow. The formation of multiphase grains is due to the presence of unstable hexagonal crystal system La2O3 in the liquid phase, which forms a eutectic structure with ZrB2 grains of the same crystal system and reacts with B2O3 to form the more stable LaBO3 or LaB6 phase. This study provides a theoretical foundation and experimental basis for the application of ZrB2-SiC-LaB6 multiphase powders.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117202"},"PeriodicalIF":5.8,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156535","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}

引用次数: 0

Promoting Yb₂Si₂O₇ environmental barrier coatings for service at 1425 °C

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-09 DOI: 10.1016/j.jeurceramsoc.2025.117200

Lin Chen , Shu-Wen Li , Chang-Jiu Li, Guan-Jun Yang

Si-based environmental barrier coatings (EBCs) are indispensable for SiC composites. However, the service temperature of next-generation composites exceeds 1400 °C, leading to melting of the Si bond coat. To mitigate this issue, Yb₂Si₂O₇ (YbDS) and mullite/YbDS coatings without Si bond coat were proposed. The results indicate that YbDS coatings can survive for 150 h at 1425 °C, while mullite/YbDS coatings experienced significant spallation during this period. Both SiO₂ phase transition and interfacial holes cause spallation of the YbDS and mullite/YbDS coatings. This research provides valuable insights for designing next-generation EBCs.

引用次数: 0

Fabrication of highly transparent Y2O3-MgO nanocomposite ceramics in the visible-near-IR wavelength

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-09 DOI: 10.1016/j.jeurceramsoc.2025.117196

Xingtao Chen , Jiahui Hu , Guoan Chen , Haojin Xu , Zhouru Kong , Bo Zhang , Jun Wang , Xiaodong Li , Yiquan Wu

In this study, Y₂O₃-MgO nanocomposite ceramics exhibiting high transparency in the visible spectrum, composed of a 50:50 vol ratio, was fabricated through the combination of sol-gel and low-temperature high-pressure (LTHP) sintering in the absence of exogenous dopants. The Y₂O₃-MgO nanocomposite precursor nanopowders was synthesized using citric acid monohydrate-nitrate combustion route. The effects of sintering parameters on the phase composition, microstructure, and optical property of the samples were investigated. The results indicated highly visible-spectrum transparent Y₂O₃-MgO nanocomposite ceramics with a grain size below 10 nm were obtained at an applied pressure of 5 GPa at 300 ℃. The optical transmittance of 2 mm thick Y₂O₃-MgO ceramics reached a maximum of 78 % at a wavelength of 1.2 µm, significantly surpassing the existing opaque Y₂O₃-MgO nanocomposite transparent ceramics in the near-IR wavelength region. The reported findings could inspire further development of transparent Y₂O₃-MgO composite ceramics for a wider range of optical applications.

{"title":"Fabrication of highly transparent Y2O3-MgO nanocomposite ceramics in the visible-near-IR wavelength","authors":"Xingtao Chen , Jiahui Hu , Guoan Chen , Haojin Xu , Zhouru Kong , Bo Zhang , Jun Wang , Xiaodong Li , Yiquan Wu","doi":"10.1016/j.jeurceramsoc.2025.117196","DOIUrl":"10.1016/j.jeurceramsoc.2025.117196","url":null,"abstract":"<div><div>In this study, Y2O3-MgO nanocomposite ceramics exhibiting high transparency in the visible spectrum, composed of a 50:50 vol ratio, was fabricated through the combination of sol-gel and low-temperature high-pressure (LTHP) sintering in the absence of exogenous dopants. The Y2O3-MgO nanocomposite precursor nanopowders was synthesized using citric acid monohydrate-nitrate combustion route. The effects of sintering parameters on the phase composition, microstructure, and optical property of the samples were investigated. The results indicated highly visible-spectrum transparent Y2O3-MgO nanocomposite ceramics with a grain size below 10 nm were obtained at an applied pressure of 5 GPa at 300 ℃. The optical transmittance of 2 mm thick Y2O3-MgO ceramics reached a maximum of 78 % at a wavelength of 1.2 µm, significantly surpassing the existing opaque Y2O3-MgO nanocomposite transparent ceramics in the near-IR wavelength region. The reported findings could inspire further development of transparent Y2O3-MgO composite ceramics for a wider range of optical applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117196"},"PeriodicalIF":5.8,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172991","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}

引用次数: 0

Improved piezoelectric performance of PbNb2O6-based ceramics via K+ modification

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-08 DOI: 10.1016/j.jeurceramsoc.2025.117193

Da Huang , Cheng Liu , Qin Yu , Hengrui Wang , Hongxi Chen , Dainan Zhang , Huaiwu Zhang

In this study, dense Pb_(1-x)K_2x[Nb_0.96Ta_0.04]₂O₆ (PKxNT, x = 0.05, 0.10, 0.15, 0.20) ceramics were prepared via the solid-state reaction method. It was discovered that the A-site vacancies filled by K⁺ induced the conversion of the tetragonal tungsten bronze (TTB) structure from “unfilled” to “filled”. Two kinds of orthorhombic ferroelectric phases were indexed from the XRD profiles. The grain morphology was transformed from equiaxed to columnar and the diffuse phase transition (DPT) behavior was observed. Improved piezoelectric performance (d₃₃ = 141 pC/N) and reduced dielectric loss (tanδ = 0.009) were obtained in the sample of PbK_0.20NT. It is suggested that the strategy of K⁺/Ta⁵⁺ co-substitution could greatly improve the piezoelectric properties of the PbNb₂O₆-based ceramic, which is promising for expanding its application scenarios.

{"title":"Improved piezoelectric performance of PbNb2O6-based ceramics via K+ modification","authors":"Da Huang , Cheng Liu , Qin Yu , Hengrui Wang , Hongxi Chen , Dainan Zhang , Huaiwu Zhang","doi":"10.1016/j.jeurceramsoc.2025.117193","DOIUrl":"10.1016/j.jeurceramsoc.2025.117193","url":null,"abstract":"<div><div>In this study, dense Pb(1-x)K2x[Nb0.96Ta0.04]2O6 (PKxNT, x = 0.05, 0.10, 0.15, 0.20) ceramics were prepared via the solid-state reaction method. It was discovered that the A-site vacancies filled by K+ induced the conversion of the tetragonal tungsten bronze (TTB) structure from “unfilled” to “filled”. Two kinds of orthorhombic ferroelectric phases were indexed from the XRD profiles. The grain morphology was transformed from equiaxed to columnar and the diffuse phase transition (DPT) behavior was observed. Improved piezoelectric performance (d33 = 141 pC/N) and reduced dielectric loss (tanδ = 0.009) were obtained in the sample of PbK0.20NT. It is suggested that the strategy of K+/Ta5+ co-substitution could greatly improve the piezoelectric properties of the PbNb2O6-based ceramic, which is promising for expanding its application scenarios.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117193"},"PeriodicalIF":5.8,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156190","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}

引用次数: 0

Grain growth kinetics and its impact on the conductivities of Ce0.9Gd0.1-xCaxO2-δ electrolyte: Average time effect and migration energy

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-08 DOI: 10.1016/j.jeurceramsoc.2025.117198

Jia-Hong Li , Zaheer Ud Din Babar , Fei-Fei Lu , Yan-An Li , Ru-Yi Hou , Muhammad Bilal Hanif , Si-Yuan Kang , Yuan Gao , Cheng-Xin Li

Gadolinium and calcium co-doped ceria-based electrolyte (GCDC) is synthesized by the co-precipitation method and grain growth behavior and its effect on the electrical conductivity are investigated. Sintering behavior results suggest that the co-doped electrolyte could be densified below 1400°C. Grain growth exponents are 6, 4, 4, 3 when the calcium doping content is 0 mol%, 0.5 mol%, 1 mol% and 2 mol%, respectively. The grain growth behavior is further elucidated through the “Average time effect” proposed in this study. Meanwhile, the electrical conductivity is 0.041 S/cm for 0.5 mol% Ca doped GDC electrolyte, which is 10 % higher than that at 0 mol% doping. The space charge potential is 0.15 V and 0.19 V for 0.5 mol% dopant and 0 mol% dopant, respectively. The specific grain boundary conductivity of the 0.5 mol% doped electrolyte exhibits a positive correlation as a function of grain size and temperature, while its total conductivity exhibits a parabolic law. This phenomenon is finally interpreted by the “Migration energy” proposed in this work.

{"title":"Grain growth kinetics and its impact on the conductivities of Ce0.9Gd0.1-xCaxO2-δ electrolyte: Average time effect and migration energy","authors":"Jia-Hong Li , Zaheer Ud Din Babar , Fei-Fei Lu , Yan-An Li , Ru-Yi Hou , Muhammad Bilal Hanif , Si-Yuan Kang , Yuan Gao , Cheng-Xin Li","doi":"10.1016/j.jeurceramsoc.2025.117198","DOIUrl":"10.1016/j.jeurceramsoc.2025.117198","url":null,"abstract":"<div><div>Gadolinium and calcium co-doped ceria-based electrolyte (GCDC) is synthesized by the co-precipitation method and grain growth behavior and its effect on the electrical conductivity are investigated. Sintering behavior results suggest that the co-doped electrolyte could be densified below 1400°C. Grain growth exponents are 6, 4, 4, 3 when the calcium doping content is 0 mol%, 0.5 mol%, 1 mol% and 2 mol%, respectively. The grain growth behavior is further elucidated through the “Average time effect” proposed in this study. Meanwhile, the electrical conductivity is 0.041 S/cm for 0.5 mol% Ca doped GDC electrolyte, which is 10 % higher than that at 0 mol% doping. The space charge potential is 0.15 V and 0.19 V for 0.5 mol% dopant and 0 mol% dopant, respectively. The specific grain boundary conductivity of the 0.5 mol% doped electrolyte exhibits a positive correlation as a function of grain size and temperature, while its total conductivity exhibits a parabolic law. This phenomenon is finally interpreted by the “Migration energy” proposed in this work.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117198"},"PeriodicalIF":5.8,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156192","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}

引用次数: 0

Ni-doped cobalt-free perovskite as the cathode for proton ceramic fuel cells

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-08 DOI: 10.1016/j.jeurceramsoc.2025.117199

Yibei Wang , Yaowei Liu , Yinxiao Wang , Yueze Li , Biao Wang , Chunling Lu , Bingbing Niu

Proton ceramic fuel cells (PCFCs), as a clean energy technology with broad application prospects, hold tremendous potential in the field of energy conversion. The development of PCFCs is limited by air electrode due to the slow kinetics at below 700°C. This paper introduces novel cobalt-free cathode Ba_0.5Sr_0.375Fe_0.875-xZr_0.125Ni_xO_3-δ (D-BSFZNx, x = 0, 0.125, 0.25) for PCFCs. Among them, D-BSFZ exhibits a second phase, which transfers to a pure phase after Ni doping. Based on the first-principles calculations (Density Functional Theory (DFT)), the oxygen vacancy formation energy decreases from 0.37 eV for D-BSFZ to 0.04 eV for D-BSFZN0.125. The research results indicate that Ni doping favors the formation of

V_{O}^{. .}

. The Density of States (DOS) and energy band diagram indicate a reduction in the band gap from 0.0065 eV to 0.0017 eV. The maximum conductivity increases from 43.20 to 64.59 S cm⁻¹ within the temperature range of 300–800 °C, suggesting that Ni doping can enhance the conductivity of D-BSFZ. The polarization resistance of D-BSFZN electrode on BaZr_0.1Ce_0.7Y_0.1Yb_0.1O_3-δ (BZCYYb) electrolyte at 650 °C is 0.06 Ω cm² in air, and the polarization resistance stability test at 550 °C can reach 100 h without significant degradation. The maximum power densities (MPD) of the single cell with D-BSFZN0.125 as air electrode at 650 °C reaches 779 mW cm⁻².

{"title":"Ni-doped cobalt-free perovskite as the cathode for proton ceramic fuel cells","authors":"Yibei Wang , Yaowei Liu , Yinxiao Wang , Yueze Li , Biao Wang , Chunling Lu , Bingbing Niu","doi":"10.1016/j.jeurceramsoc.2025.117199","DOIUrl":"10.1016/j.jeurceramsoc.2025.117199","url":null,"abstract":"<div><div>Proton ceramic fuel cells (PCFCs), as a clean energy technology with broad application prospects, hold tremendous potential in the field of energy conversion. The development of PCFCs is limited by air electrode due to the slow kinetics at below 700°C. This paper introduces novel cobalt-free cathode Ba0.5Sr0.375Fe0.875-xZr0.125NixO3-δ (D-BSFZNx, x = 0, 0.125, 0.25) for PCFCs. Among them, D-BSFZ exhibits a second phase, which transfers to a pure phase after Ni doping. Based on the first-principles calculations (Density Functional Theory (DFT)), the oxygen vacancy formation energy decreases from 0.37 eV for D-BSFZ to 0.04 eV for D-BSFZN0.125. The research results indicate that Ni doping favors the formation of <math><msubsup><mrow><mi>V</mi></mrow><mrow><mi>O</mi></mrow><mrow><mo>.</mo><mo>.</mo></mrow></msubsup></math>. The Density of States (DOS) and energy band diagram indicate a reduction in the band gap from 0.0065 eV to 0.0017 eV. The maximum conductivity increases from 43.20 to 64.59 S cm⁻¹ within the temperature range of 300–800 °C, suggesting that Ni doping can enhance the conductivity of D-BSFZ. The polarization resistance of D-BSFZN electrode on BaZr0.1Ce0.7Y0.1Yb0.1O3-δ (BZCYYb) electrolyte at 650 °C is 0.06 Ω cm² in air, and the polarization resistance stability test at 550 °C can reach 100 h without significant degradation. The maximum power densities (MPD) of the single cell with D-BSFZN0.125 as air electrode at 650 °C reaches 779 mW cm⁻².</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117199"},"PeriodicalIF":5.8,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156184","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}

引用次数: 0

Axial plasma spraying of aqueous solution precursors: A facile approach for columnar thermal barrier coatings

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-08 DOI: 10.1016/j.jeurceramsoc.2025.117189

Thomas Hervy , Nicholas Curry , Stefan Björklund , Frantisek Lukac , Shrikant Joshi

Thermal barrier coatings (TBC) are an essential part of modern gas turbines for aviation and power generation. As such, there is an incessant demand for improved TBC performance and longevity. Of the possible coating microstructures, the columnar structure first produced by electron beam physical vapour deposition was found to be most durable. The subsequently developed suspension plasma spray coatings are seen as an alternative method for producing columnar TBCs but typically utilise flammable solvents to achieve such structures. Aqueous solution precursors have also been used as a feedstock to deposit yttria stabilised zirconia (YSZ) TBCs; however, columnar structures have proven elusive, with solution precursor plasma spray (SPPS) deposition conditions and throughputs involving radial feed spray torches also being industrially unattractive. This study illustrates the first columnar coatings of single-layer yttria stabilised zirconia from an aqueous solution precursor using an axial feed capable plasma torch. Coatings have been shown to be columnar structured over a robust operating window, fully tetragonal in phase constitution and capable of being deposited at rates that can be commercially interesting. These initial results lay a great foundation for further TBC development utilizing an aqueous, powder-free, feedstock.

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引用次数: 0

Cuprite crystallization in glasses: Redox changes and the impact of copper and lead in reducing atmospheres

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2025-01-08 DOI: 10.1016/j.jeurceramsoc.2025.117195

Cécile Noirot , Laurent Cormier , Daniel R. Neuville , Nadine Schibille

The production of red and orange cuprite glass and glazes depends on a complex interplay of glass composition, redox states, and thermal treatments. This study investigates how lead and copper concentrations impact the copper redox state and cuprite crystal formation. Spectroscopy (EPR, XANES at Cu L₃ and K edges) shows that high copper content leads to slight oxidation, while high lead levels induce mild reduction, neither of which directly initiating cuprite crystallization. In situ XANES analysis under reducing conditions reveals that strong undercooling is essential for cuprite formation, with lead primarily lowering the glass transition temperature, allowing large dendritic cuprite crystals to produce red colors while smaller crystals yield orange. These findings shed light on ancient glassmaking techniques, such as those in Roman glass tesserae.

引用次数: 0

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