Ceramics International最新文献_第5页

Effects of phase components on the microstructure and mechanical properties of Al2O3-based directionally solidified eutectic ceramics 相组分对al2o3基定向凝固共晶陶瓷显微组织和力学性能的影响

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-21 DOI: 10.1016/j.ceramint.2026.01.230

Dezhi Yang , Juncheng Liu , Rui Gao , Zeye Chen , Shunhao Ge

The Al₂O₃-based of directionally solidified eutectic ceramics (DSECs) has been widely recognized as the most promising candidates for the ultra-high temperature structural materials due to their excellent oxidation resistance and high temperature mechanical properties. However, several challenges remain to be addressed before their practical applications, such as the fracture toughness improvement and the microstructure stability during the long-term high-temperature service. Herein, the effects of phase components on the initial microstructure morphology and size, and the mechanical properties of the binary or ternary DSECs prepared with the same technique and the comparable processing parameters were systematically reviewed and analyzed. The employed fabrication techniques includes the high-frequency induction zone melting method (IHZM), laser floating zone method (LFZ), optical floating zone technique (OFZ), micro-pulling down method (μ-PD), and Bridgman method. The binary DSECs include Al₂O₃/MgAl₂O₄, Al₂O₃/YSZ, Al₂O₃/YAG, Al₂O₃/EAG, and Al₂O₃/GdAlO₃, etc., while the ternary DSECs mainly involve Al₂O₃/YAG/ZrO₂, Al₂O₃/EAG/ZrO₂, and Al₂O₃/GdAlO₃/ZrO₂, etc. The significant correlations among the microstrucure (the eutectic morphology and the spacing λ₀), the mechanical properties (the hardness H, the flexural strength σ_f, and the tensile strength σ_t), the phase components, and the phase interfacial energy were tried to be established, so as to provide a significant reference to optimize the microstructure and mechanical properties of Al₂O₃-based DSECs. In addition, some vague, unclear, and even contradictory issues were also set forth, and some research directions worth striving for in the future research work on DSECs were also proposed to address these issues.

基于al2o3的定向凝固共晶陶瓷（DSECs）由于其优异的抗氧化性能和高温力学性能而被广泛认为是超高温结构材料中最有前途的候选材料。然而，在实际应用之前，仍有一些挑战需要解决，如断裂韧性的提高和长期高温使用期间的显微组织稳定性。在此，系统地回顾和分析了相组分对采用相同工艺和可比较的工艺参数制备的二元或三元DSECs的初始组织形态和尺寸以及力学性能的影响。采用的制备技术包括高频感应区熔化法（IHZM）、激光浮区法（LFZ）、光学浮区法（OFZ）、微下拉法（μ-PD）和Bridgman法。二元DSECs主要有Al2O3/MgAl2O4、Al2O3/YSZ、Al2O3/YAG、Al2O3/EAG、Al2O3/GdAlO3等，三元DSECs主要有Al2O3/YAG/ZrO2、Al2O3/EAG/ZrO2、Al2O3/GdAlO3/ZrO2等。试图建立显微组织（共晶形貌和间距λ0）、力学性能（硬度H、抗折强度σf和抗拉强度σt）、相组分和相界面能之间的显著相关性，为优化al2o3基DSECs的显微组织和力学性能提供重要参考。此外，还提出了一些模糊、不明确甚至相互矛盾的问题，并针对这些问题提出了未来DSECs研究工作中值得努力的研究方向。

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引用次数: 0

Effects of annealing process on mechanical and thermal properties of pressureless solid-state sintered SiC ceramics 退火工艺对无压固态烧结SiC陶瓷力学和热性能的影响

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-13 DOI: 10.1016/j.ceramint.2026.01.154

Shichao Wang , Jialin Bai , Pengfei Zhang , Yang Xia , Yanbao Cai , Ye Cui , Min Zhang , Xuejian Liu , XiuMin Yao , Zhengren Huang

Pressureless solid-state sintered SiC ceramics were fabricated using boric acid and sucrose as precursors, yielding 0.1 wt% B and 1.0 wt% C. Effects of annealing process on thermal and mechanical properties were investigated. Results indicate that annealing had a limited influence on density, grain size, and phase composition but significantly affected silicon vacancy concentration, thereby modulating thermal conductivity. As the annealing temperature (1650–1750 °C) or duration (2–4 h) increased, the reduction of silicon vacancies suppressed phonon scattering, enhancing the thermal conductivity to 197.2 W m⁻¹ K⁻¹ at 1750 °C for 4 h. Prolonged annealing (4–12 h) allowed silicon vacancies to reach equilibrium; however, excessive temperatures (>1750 °C) hindered the effective reduction of silicon vacancies, and the thermal conductivity remained nearly unchanged compared to the unannealed samples. SiC ceramics subjected to annealing exhibited a maximum thermal conductivity of 197.4 W m⁻¹ K⁻¹ (annealed at 1750 °C for 12 h) along with a flexural strength, elastic modulus, fracture toughness, and hardness of 438 MPa, 415 GPa, 2.2 MPa m^1/2, and 25.1 GPa, respectively.

以硼酸和蔗糖为前驱体制备了无压固体烧结SiC陶瓷，制备了收率为0.1 wt% B和1.0 wt% c的陶瓷，研究了退火工艺对陶瓷热性能和力学性能的影响。结果表明，退火对密度、晶粒尺寸和相组成的影响有限，但会显著影响硅空位浓度，从而调节导热系数。随着退火温度（1650-1750°C）或时间（2-4 h）的增加，硅空位的减少抑制了声子散射，使热导率在1750°C下提高到197.2 W m−1 K−1。延长退火时间（4 - 12 h）使硅空位达到平衡；然而，过高的温度（>1750°C）阻碍了硅空位的有效减少，与未退火样品相比，导热系数几乎保持不变。经过退火处理的SiC陶瓷的最大导热系数为197.4 W m−1 K−1（在1750℃退火12 h），弯曲强度、弹性模量、断裂韧性和硬度分别为438 MPa、415 GPa、2.2 MPa m1/2和25.1 GPa。

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引用次数: 0

Sol–gel synthesized Mn4+-doped Ba2CaWO6 phosphors: Structural and EPR studies highlighting luminescence potential 溶胶-凝胶合成Mn4+掺杂Ba2CaWO6荧光粉：结构和EPR研究突出发光电位

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-17 DOI: 10.1016/j.ceramint.2026.01.210

Rahul Vikram Singh , Aadil Ahmad Bhat , S. Watanabe , T.K. Gundu Rao , Jung-Kul Lee , Vijay Singh

Mn⁴⁺-doped Ba₂CaWO₆ double perovskites were synthesized using a sol–gel method and their structural and optical properties were studied. Analysis through X-ray diffraction, Fourier-transform infrared spectroscopy, and diffuse reflectance spectroscopy confirmed the purity of the phase and successful incorporation of Mn⁴⁺ ions into the structure. The phosphors exhibited deep-red emission around 669 and 695 nm, originating from the spin-forbidden ²E → ⁴A₂ transition of Mn⁴⁺ ions. Concentration-dependent photoluminescence revealed notable spectral variations at ultra-low doping levels (0.0012–0.035 mol). The Ba₂CaWO₆:Mn⁴⁺ phosphor exhibited high color purity with a correlated color temperature of approximately 6420 K, indicating its suitability for applications that require red illumination and its potential use in indoor plant growth lighting. Notably, this work presents the first detailed electron paramagnetic resonance characterization of Ba₂CaWO₆:Mn⁴⁺, where distinct hyperfine features confirm dopant site occupancy and reveal insights into the local electronic environment of Mn⁴⁺ ions. A six-line electron paramagnetic resonance spectrum with a g-value of 1.99 was observed for the Ba₂CaWO₆:Mn⁴⁺ phosphor, and an additional broad line overlapped this six-line spectrum. Moreover, the dopant ion Mn⁴⁺ most likely substituted the W⁶⁺ sites in the perovskite. These findings can help optimize doping strategies and develop deep-red emitters for plant growth lighting.

采用溶胶-凝胶法制备了掺杂Mn4+的Ba2CaWO6双钙钛矿，并对其结构和光学性质进行了研究。通过x射线衍射、傅里叶变换红外光谱和漫反射光谱分析，证实了相的纯度和Mn4+离子成功进入结构。荧光粉在669 nm和695 nm左右发射出深红色，这是由于Mn4+离子的自旋禁止2E→4A2跃迁所致。在超低掺杂浓度（0.0012 ~ 0.035 mol）下，光致发光光谱变化显著。Ba2CaWO6:Mn4+荧光粉具有较高的色纯度，相关色温约为6420 K，表明其适合需要红色照明的应用，并具有在室内植物生长照明中的潜在应用前景。值得注意的是，这项工作首次提出了Ba2CaWO6:Mn4+的详细电子顺磁共振表征，其中独特的超精细特征证实了掺杂剂的位置占用，并揭示了Mn4+离子的局部电子环境。Ba2CaWO6:Mn4+荧光粉的电子顺磁共振谱为6线，g值为1.99，并在这6线谱上附加了一条宽频线。此外，掺杂离子Mn4+很可能取代了钙钛矿中的W6+位点。这些发现有助于优化兴奋剂策略和开发用于植物生长照明的深红色发射器。

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引用次数: 0

Structural and optical analysis of SrTiO3:Eu3+ phosphors: A novel engineering material for lighting applications SrTiO3:Eu3+荧光粉的结构和光学分析：一种新型照明工程材料

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-19 DOI: 10.1016/j.ceramint.2026.01.213

Bungala Chinna Jamalaiah , Shaik Nayab Rasool , Mula Jayasimhadri , Vikas Sangwan , Tummala Chengaiah

The SrTiO₃ cubic perovskite phosphors activated with Eu³⁺ ions were synthesized through modified citrate gel combustion process. Powder X-ray diffraction technique was employed for structural analysis. These phosphors underwent inspection of morphological and elemental analysis via SEM and EDS, respectively. The UV–Visible diffuse reflectance was employed for the estimation of band gap energy. The luminescent features were investigated via excitation, emission and decay studies. The observed emission bands were assigned to ⁵D₀ → ⁷F_J=0-4 intra 4f-4f transitions of Eu³⁺ ions. The SrTiO₃: 0.07 Eu³⁺ phosphor was found producing intense red emission having a colour purity of 97.8 %, correlated colour temperature of 2601 K and an extraordinary thermal stability with an activation energy of 0.33 eV upon 394 nm nUV excitation shows its relevance for the design of lighting devices and the red component in tricolour phosphor based white LEDs.

采用改性柠檬酸凝胶燃烧法制备了Eu3+活化的SrTiO3立方钙钛矿荧光粉。采用粉末x射线衍射技术进行结构分析。这些荧光粉分别通过扫描电镜和能谱仪进行了形态和元素分析。利用紫外-可见漫反射来估计带隙能量。通过激发、发射和衰变研究了其发光特性。Eu3+离子在4f-4f跃迁内的5D0→7FJ=0-4发射谱带。研究发现，SrTiO3: 0.07 Eu3+荧光粉产生强烈的红色发射，其色纯度为97.8%，相关色温为2601 K，在394 nm nUV激发下具有出色的热稳定性，活化能为0.33 eV，这表明它与照明器件设计和基于三色荧光粉的白光led中的红色成分相关。

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引用次数: 0

Rapid-response optically stimulated luminescence dosimeter of Dy3+-doped NaBaPO4 glass-ceramic Dy3+掺杂NaBaPO4玻璃陶瓷的快速响应光激发发光剂量计

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-17 DOI: 10.1016/j.ceramint.2026.01.215

Houjin Hu , Zhaoyang Chen , Siping Wang , Lei Xia , Zuyang Gao , Yanglong Shi , Bolong Zhang , Yi Liu , Shala Bi

Optically stimulated luminescence (OSL) materials are widely used in the field of radiation monitoring owing to their cumulative dose measurement capability and excellent tissue-equivalence properties. However, commercial OSL dosimeters faced the bottlenecks of long response times, complex fabrication processes, and inherent toxicity, which hinder their applications in various measurement conditions. Here, a Dy³⁺-doped NaBaPO₄ glass-ceramic with rapid-response characteristics is successfully prepared, and this material is particularly suitable for the scenarios requiring fast signal readout and efficient signal bleaching. XRD results confirmed the formation of NaBaPO₄ crystals in the samples. White light emission was achieved from the photoluminescence spectra through a combination of the characteristic Dy³⁺ emission peaks at 482 nm (blue), 576 nm (yellow), 667 nm (red), and 757 nm (near-infrared). Notably, the results of OSL and thermoluminescence curves demonstrate the presence of shallow traps with depths of 0.66 eV, 0.74 eV, and 0.80 eV, and these shallow traps enable rapid signal readout (decay constants

τ

= 0.1112 s, 2.6022 s, and 10.0998 s) and short optical bleaching time (240 s). The material also displays outstanding dosimetric properties, including excellent reusability (RSD = 1.11 %) and remarkable dose response linearity range from 0.1 Gy to 200 Gy (R² = 0.9984). This study presents a new material solution characterized by rapid response for applications requiring fast and accurate radiation dose measurement.

光激发发光材料因其具有累积剂量测量能力和优异的组织等效性能而广泛应用于辐射监测领域。然而，商用OSL剂量计面临响应时间长、制造工艺复杂和固有毒性等瓶颈，阻碍了其在各种测量条件下的应用。本文成功制备了一种具有快速响应特性的掺Dy3+的NaBaPO4玻璃陶瓷，该材料特别适用于需要快速读出信号和高效漂白信号的场景。XRD结果证实了样品中形成了NaBaPO4晶体。通过在482 nm（蓝色），576 nm（黄色），667 nm（红色）和757 nm（近红外）的特征发射峰组合，从光致发光光谱中获得白光发射。值得注意的是，OSL和热释光曲线的结果表明存在深度为0.66 eV， 0.74 eV和0.80 eV的浅阱，这些浅阱能够快速读出信号（衰变常数τ = 0.1112 s， 2.6022 s和10.0998 s）和短的光学漂白时间（240 s）。该材料还表现出优异的剂量学性能，包括良好的可重复使用性（RSD = 1.11%）和0.1 Gy ~ 200 Gy的显著剂量响应线性范围（R2 = 0.9984）。本研究提出了一种新的材料解决方案，具有快速响应的特点，适用于需要快速准确测量辐射剂量的应用。

{"title":"Rapid-response optically stimulated luminescence dosimeter of Dy3+-doped NaBaPO4 glass-ceramic","authors":"Houjin Hu , Zhaoyang Chen , Siping Wang , Lei Xia , Zuyang Gao , Yanglong Shi , Bolong Zhang , Yi Liu , Shala Bi","doi":"10.1016/j.ceramint.2026.01.215","DOIUrl":"10.1016/j.ceramint.2026.01.215","url":null,"abstract":"<div><div>Optically stimulated luminescence (OSL) materials are widely used in the field of radiation monitoring owing to their cumulative dose measurement capability and excellent tissue-equivalence properties. However, commercial OSL dosimeters faced the bottlenecks of long response times, complex fabrication processes, and inherent toxicity, which hinder their applications in various measurement conditions. Here, a Dy3+-doped NaBaPO4 glass-ceramic with rapid-response characteristics is successfully prepared, and this material is particularly suitable for the scenarios requiring fast signal readout and efficient signal bleaching. XRD results confirmed the formation of NaBaPO4 crystals in the samples. White light emission was achieved from the photoluminescence spectra through a combination of the characteristic Dy3+ emission peaks at 482 nm (blue), 576 nm (yellow), 667 nm (red), and 757 nm (near-infrared). Notably, the results of OSL and thermoluminescence curves demonstrate the presence of shallow traps with depths of 0.66 eV, 0.74 eV, and 0.80 eV, and these shallow traps enable rapid signal readout (decay constants <math><mrow><mi>τ</mi></mrow></math> = 0.1112 s, 2.6022 s, and 10.0998 s) and short optical bleaching time (240 s). The material also displays outstanding dosimetric properties, including excellent reusability (RSD = 1.11 %) and remarkable dose response linearity range from 0.1 Gy to 200 Gy (R2 = 0.9984). This study presents a new material solution characterized by rapid response for applications requiring fast and accurate radiation dose measurement.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 8","pages":"Pages 10411-10419"},"PeriodicalIF":5.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147419777","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

Unveiling insights of sustainable tetra metal nanocrystallite chalcogenide thin film grown on IDE as a novel material for temperature sensing 揭示了在IDE上生长的可持续四金属纳米晶硫族化合物薄膜作为一种新型温度传感材料的见解

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-17 DOI: 10.1016/j.ceramint.2026.01.158

Abdulaziz Alhoshany , Subbarayan Sivasankaran

This study aims to develop and evaluate a high-performance temperature sensor based on nanocrystallite tetra-metal chalcogenide thin films. The sensing material, Cu₂ZnSnS₄/Se₄ (Cu₅S₄:ZnS:ZnSe:SnSe), was synthesized using a single-step high-energy mechanical alloying process from high-purity elemental powders. Structural, morphological, and compositional analyses were performed using X Ray diffraction (XRD), high-resolution scanning electron microscopy (HRSEM), and high-resolution transmission electron microscopy (HRTEM), confirming the formation of nanocrystalline phases with lattice distortions. Unlike conventional binary or ternary chalcogenides, which often suffer from limited interfacial polarization and reduced temperature sensitivity due to fewer interfaces and structural uniformity, the quinary system introduces multiple nanocrystalline interfaces, enhanced lattice disorder, and tunable electronic properties, overcoming these limitations. The fabricated tetra-metal chalcogenide-based interdigitated electrode (IDE) sensor, prepared via spin-coating, demonstrated an excellent temperature sensitivity of 0.0077/°C (1005 fF/°C) and strong linearity (coefficient of determination, R² = 0.9804) over the range of 24–108 °C. The sensor's performance surpasses that of many reported capacitive temperature sensors, offering advantages in sensitivity, fabrication cost, and potential integration in flexible electronic device. These results highlight the feasibility of using tetra-metal chalcogenide thin films for next-generation temperature sensing devices.

本研究旨在开发和评估基于纳米晶四金属硫族化物薄膜的高性能温度传感器。以高纯度元素粉末为原料，采用单步高能机械合金化工艺合成了Cu2ZnSnS4/Se4 （Cu5S4:ZnS:ZnSe:SnSe）传感材料。利用X射线衍射（XRD）、高分辨率扫描电镜（HRSEM）和高分辨率透射电镜（HRTEM）进行了结构、形态和成分分析，证实了具有晶格畸变的纳米晶相的形成。传统的二元或三元硫族化合物通常由于界面较少和结构均匀性而受到界面极化有限和温度敏感性降低的影响，而五元硫族化合物引入了多个纳米晶界面，增强了晶格无序性和可调谐的电子性质，克服了这些限制。采用自旋镀膜法制备的四金属硫族化合物基交叉指状电极（IDE）传感器在24 ~ 108℃范围内具有良好的温度灵敏度（0.0077/°C, 1005 fF/°C）和良好的线性（决定系数R2 = 0.9804）。该传感器的性能超过了许多已有报道的电容式温度传感器，在灵敏度、制造成本和柔性电子器件集成方面具有优势。这些结果强调了将四金属硫系薄膜用于下一代温度传感器件的可行性。

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引用次数: 0

Visible light-driven enhanced photocatalytic dye degradation for wastewater treatment using sol-gel auto-combustion synthesized magnetic BaCO3–Fe3O4–MgO nanocomposite 溶胶-凝胶自燃烧合成的磁性BaCO3-Fe3O4-MgO纳米复合材料在可见光驱动下增强光催化染料降解废水处理中的应用

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-13 DOI: 10.1016/j.ceramint.2026.01.167

Nichapa Rattanakomon , Paweena Porrawatkul , Rungnapa Pimsen , Benjawan Ninwong , Suresh Sagadevan , Wuttichai Roschat , Prawit Nuengmatcha

This study reports the synthesis of a novel magnetic BaCO₃-Fe₃O₄-MgO (BFM) catalyst via a sol-gel auto-combustion method. X-ray diffraction (XRD) result has confirmed the presence of witherite (BaCO₃), periclase (MgO), and magnetite (Fe₃O₄) phases. Field-emission scanning electron microscopy (FESEM) analysis has revealed distinct morphologies for all three components on the BFM surface. Energy-dispersive X-ray spectroscopy (EDX) revealed the elemental composition of BFM catalyst. Bandgap energies were determined as 3.89 eV (BaCO₃), 2.08 eV (Fe₃O₄), 4.09 eV (MgO), and 2.36 eV (BFM). The saturation magnetization of 9.0873 emu/g has supported the facile magnetic recovery. Photocatalytic performance was evaluated via methylene blue (MB) degradation under visible light. BFM exhibited the highest rate constant (0.0232 min⁻¹), significantly demonstrating individual components Fe₃O₄ (0.0063 min⁻¹), MgO (0.0054 min⁻¹), and BaCO₃ (0.0043 min⁻¹). The degradation mechanism is elucidated in detail. Hence, the outcome of this study on the ternary nanocomposite of BaCO₃-Fe₃O₄-MgO, exhibits the synergistic effects that enable efficient visible-light-driven photocatalysis for dye degradation in wastewater treatment.

本研究采用溶胶-凝胶自燃烧法合成了一种新型的BaCO3-Fe3O4-MgO （BFM）磁性催化剂。x射线衍射（XRD）结果证实了该矿石中存在辉石（BaCO3）、镁长石（MgO）和磁铁矿（Fe3O4）相。场发射扫描电子显微镜（FESEM）分析揭示了BFM表面上所有三种成分的不同形态。能量色散x射线光谱（EDX）揭示了BFM催化剂的元素组成。带隙能分别为3.89 eV （BaCO3）、2.08 eV （Fe3O4）、4.09 eV （MgO）和2.36 eV （BFM）。饱和磁化强度为9.0873 emu/g，磁恢复速度快。通过亚甲基蓝（MB）在可见光下的降解来评价光催化性能。BFM的速率常数最高（0.0232 min−1），其中Fe3O4 （0.0063 min−1）、MgO （0.0054 min−1）和BaCO3 （0.0043 min−1）的速率常数最高。详细阐述了其降解机理。因此，本研究的结果表明，BaCO3-Fe3O4-MgO三元纳米复合材料显示出协同效应，使可见光驱动光催化在废水处理中有效地降解染料。

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引用次数: 0

Tuning the morphology and defect density of Mg(OH)2 nanoplatelets through microwave-assisted wet synthesis for photocatalytic applications 微波辅助湿法合成光催化用Mg(OH)2纳米片的形貌和缺陷密度

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2025-12-29 DOI: 10.1016/j.ceramint.2025.12.469

Karishma Jain, Prarbdh Bhatt, Saikat Chattopadhyay, Sushil Kumar Jain, Nilanjan Halder

The study reports synthesis of platelet-shaped Mg(OH)₂ via a microwave-assisted solvothermal precipitation method to develop cost-effective and eco-friendly photocatalysts for water purification. Varying the microwave power influenced crystallinity, size, and defect density of the hexagonal Mg(OH)₂ platelets. High-power (60 W) synthesis produced smaller, thinner nanoplatelets with increased defect density, leading to superior photocatalytic degradation of methylene blue (k = 0.00179 min⁻¹, R² = 0.99217) under UV light. The improved performance is attributed to accelerated seed nucleation, increased surface area for dye adsorption, and enhanced reactive oxygen species generation due to controlled defect formation. The findings emphasize the critical role of microwave power in tailoring crystallinity and defect structures, enabling optimization of Mg(OH)₂ nanostructures for efficient adsorption and photocatalytic degradation of organic pollutants.

该研究报道了利用微波辅助溶剂热沉淀法合成血小板状Mg(OH)2，以开发具有成本效益和环保性的水净化光催化剂。不同的微波功率影响了六方Mg(OH)2血小板的结晶度、大小和缺陷密度。高功率（60 W）合成得到更小、更薄的纳米薄片，缺陷密度增加，从而在紫外光下具有更好的光催化降解亚甲基蓝（k = 0.00179 min−1,R2 = 0.99217）。改进的性能归因于加速种子成核，增加染料吸附的表面积，以及由于控制缺陷形成而增强的活性氧生成。这些发现强调了微波功率在定制结晶度和缺陷结构方面的关键作用，从而优化了Mg(OH)2纳米结构，以有效吸附和光催化降解有机污染物。

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引用次数: 0

Structure, magnetism and microwave absorption of NiCr2O4 chromites NiCr2O4铬铁矿的结构、磁性及微波吸收

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2025-12-31 DOI: 10.1016/j.ceramint.2025.12.523

Wei Wang , Yongkun Wang , Yehan Yan , Pengzhen He , Mudssir Shezad , Xiaoyang Fan , Houbao Liu , Kun Xiang , Guanglin Wang

This study explores the structural, magnetic, and dielectric properties of nickel chromite (NiCr₂O₄) synthesized using the sol-gel method. X-ray diffraction (XRD) studies indicate that NiCr₂O₄ exhibits a tetragonal structure (space group I4₁/amd) at room temperature, deviating from the cubic spinel symmetry owing to Jahn–Teller distortions. Microstructural analyses using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) reveal the homogeneous nanoparticle morphology of NiCr₂O₄ with an average grain size of 200 nm. Magnetic hysteresis (M-H) studies indicate ferromagnetic behavior at 5 K with a coercivity of 0.6 T, whereas temperature-dependent magnetization (M-T) curves of NiCr₂O₄ show a paramagnetic-to-ferrimagnetic transition at 70 K. Dielectric analysis demonstrates frequency-dependent permittivity and magneto-dielectric coupling under an applied magnetic field. The structure–property correlation of NiCr₂O₄ is investigated for electromagnetic wave absorption, with composite engineering suggested to enhance the absorption bandwidth.

研究了溶胶-凝胶法制备的镍铬铁矿（NiCr2O4）的结构、磁性和介电性能。x射线衍射（XRD）研究表明，NiCr2O4在室温下表现为四边形结构（空间群I41/amd），由于Jahn-Teller畸变而偏离立方尖晶石对称。扫描电镜（SEM）和透射电镜（TEM）分析表明，NiCr2O4的纳米颗粒形貌均匀，平均晶粒尺寸为200 nm。磁滞（M-H）研究表明，NiCr2O4在5 K时具有铁磁行为，矫顽力为0.6 T，而在70 K时，NiCr2O4的温度相关磁化（M-T）曲线显示出顺磁到铁磁的转变。电介质分析证明了外加磁场下频率相关的介电常数和磁介电耦合。研究了NiCr2O4对电磁波吸收的结构-性能相关性，并提出了复合工程的建议，以提高吸收带宽。

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引用次数: 0

Improving interfacial stability and joint strength of glass-sealed AISI 441 stainless steels via Cr2O3/CeO2/Co3O4 diffusion barrier layer for solid oxide fuel cell 利用Cr2O3/CeO2/Co3O4扩散阻挡层提高固体氧化物燃料电池用玻璃密封AISI 441不锈钢的界面稳定性和接头强度

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-02 DOI: 10.1016/j.ceramint.2026.01.004

Wei Cong , Yangfan Fu , Peng He , Tiesong Lin , Guangjie Feng , Zhanpeng Zhang , Yifeng Wang , Qian Wang

Reliable glass-to-interconnect sealing is essential for the durability of solid oxide fuel cell (SOFC) stacks, yet chromium (Cr) outward diffusion and interfacial degradation frequently undermine joint integrity. Here, a pre-oxidation-derived Cr₂O₃/CeO₂/Co₃O₄ tri-layer diffusion barrier was formed on the Ce/Co-coated AISI 441 ferritic stainless steel, and its effects on the interfacial microstructure and mechanical performance of glass-sealed joints were systematically evaluated. Results showed that the tri-layer barrier retained a stable crystalline structure after sealing and effectively suppressed outward diffusion of Cr species into the glass sealant. Optimized sealing at 850 °C for 30 min regulated interfacial reactions and produced a maximum shear strength of 50.2 ± 2.1 MPa, representing a 22.7 % improvement over uncoated joints (40.9 ± 1.2 MPa), thereby demonstrating enhanced interfacial bonding. After thermal exposure at 750 °C for 100 h, Cr migration toward the glass remained minimal, and the coated joints retained 96.2 % of their initial strength (48.3 MPa). These findings highlight that the pre-oxidation-derived Cr₂O₃/CeO₂/Co₃O₄ barrier simultaneously enhances interfacial stability and joint strength in glass-sealed SOFC interconnects, supporting durable stack operation.

可靠的玻璃-互连密封对于固体氧化物燃料电池（SOFC）堆叠的耐久性至关重要，但铬（Cr）向外扩散和界面降解经常破坏连接的完整性。在Ce/ co涂层AISI 441铁素体不锈钢表面形成了预氧化生成的Cr2O3/CeO2/Co3O4三层扩散势垒，并对其对玻璃密封接头界面微观结构和力学性能的影响进行了系统评价。结果表明，三层阻挡层在密封后保持了稳定的晶体结构，有效地抑制了Cr物质向玻璃密封胶中的扩散。在850°C下优化密封30分钟，调节界面反应，产生的最大剪切强度为50.2±2.1 MPa，比未涂层接头（40.9±1.2 MPa）提高22.7%，从而证明了界面结合的增强。在750℃下热暴露100 h后，Cr向玻璃的迁移保持在最低水平，涂层接头的强度保持在初始强度（48.3 MPa）的96.2%。这些研究结果表明，预氧化生成的Cr2O3/CeO2/Co3O4屏障同时增强了玻璃密封SOFC互连中的界面稳定性和连接强度，支持持久的堆叠操作。

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