Journal of the American Ceramic Society最新文献

{"title":"Study on recycling of lead-based piezoceramics using trimethylchloromethyl ammonium-based halide perovskite binder","authors":"Mohadeseh Tabeshfar,&nbsp;Mikko Nelo,&nbsp;Sivagnana Sundaram Anandakrishnan,&nbsp;Jani Peräntie,&nbsp;Yang Bai","doi":"10.1111/jace.20714","DOIUrl":"https://doi.org/10.1111/jace.20714","url":null,"abstract":"<p>Oxide-halide perovskite upside-down composites have been demonstrated for recycling heavy-eco-footprint piezoceramics. However, options for the binders are limited. As the binder significantly affects the electrical properties of the recycled materials, the available binder material pool needs to be expanded. This work explores the use of a halide perovskite compound, Me₃NCH₂ClCdCl₃ (TMCM-CdCl₃), as the binder to study the interplay between the filler's and binder's characteristics and its influence on electrical properties of the recycled piezoceramics. Two Pb-containing ceramic fillers, Pb(Zr,Ti)O₃ and Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃, which possess distinct permittivity and Curie temperatures, are used in the study. A wide range of fabrication temperatures span the fillers’ and binder's phase transition and decomposition regions are involved. Results suggest that a coincidence of the filler's ferroelectric-paraelectric phase transition with the binder's decomposition during fabrication can significantly degrade the composite's electrical properties due to the microstructural frustration among porosity increase, densification lag, and enlarged filler-binder permittivity mismatch. This work has achieved the champion relative permittivity of ∼600 at 1 kHz and comparable piezoelectric responses (charge and voltage coefficients of ∼90 pC N⁻¹ and 31-32 mVm N⁻¹, respectively) among all the known upside-down composites. These results advance the understanding of structure-property correlations in upside-down composites.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20714","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A super broad emission band in tri-doped orthosilicate phosphors for full-spectrum white light illumination","authors":"Yiting Lin,&nbsp;Huiyu Ma,&nbsp;Hai Li,&nbsp;Hongxia Sang,&nbsp;Shixun Lian","doi":"10.1111/jace.20675","DOIUrl":"https://doi.org/10.1111/jace.20675","url":null,"abstract":"<p>A series of solid solution Sr<i>_m</i>Ca₂₋<i>_m</i>SiO₄ (SCS) tri-doped with Ce³⁺, Tb³⁺, Eu³⁺ (SCS: Ce, Tb, Eu) phosphors were synthesized by the traditional high-temperature solid-state reaction. In the orthosilicate crystal system Sr_1.5Ca_0.5SiO₄, tri-doped rare earth ions Ce³⁺, Tb³⁺, and Eu³⁺ are independent luminescent centers. Under the excitation of UV light, they exhibited three emission bands: the first broadband peaked at 420 nm, the second band with sharp lines peaked in green (about 554 nm), and the third band in the orange-red region (588–720 nm), which are originated from 5d → 4f of Ce³⁺,⁵D₄ →⁷F_<i>J</i> of Tb³⁺, and ⁵D₀ →⁷F_<i>J</i> of Eu³⁺, respectively. On the other hand, as aggregated luminescent centers which emission is with comparable intensities at suitable concentration resulted in separate luminescent peaks connected, form a super broad emission band and lead to color-tunable emission. To fine control white emission, a series of solid solution phosphors Sr<i>_m</i>Ca_1.969−<i>_m</i>SiO₄:0.6% Ce³⁺, 0.15% Tb³⁺, 0.8% Eu³⁺, 1.55%Li⁺ (SCS: Ce,Tb,Eu) had been prepared. This phosphor reveals that a full-spectra emission in the visible light region can be obtained when the mole percent of Sr²⁺ in the solid solution matrix is 65%–90% (<i>m</i> = 1.3–1.8), and the nominal composition Sr_1.7Ca_0.3SiO₄: 0.6% Ce³⁺, 0.15% Tb³⁺, 0.8% Eu³⁺, 1.55% Li⁺ phosphor can realize a super broad emission band with a full width at half maximum (FWHM) of 147 nm that match well with the solar spectrum in the visible light region. The result reveals that it is a potential single-phase full-spectrum white light (SFWL) phosphor for UV-chip-based white LED, which can be applied in full spectrum illumination and plant growth light sources. The luminescent mechanism was also discussed in detail.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermophysical property evaluation of rare-earth hafnate RE2Hf2O7 as long-life service neutron absorber component","authors":"Shuyi Zhu,&nbsp;Jiawei Mu,&nbsp;Yanli Shi,&nbsp;Kailei Lu,&nbsp;Lin Chen,&nbsp;Jianqi Qi,&nbsp;Tiecheng Lu","doi":"10.1111/jace.20709","DOIUrl":"https://doi.org/10.1111/jace.20709","url":null,"abstract":"<p>Control rods are essential components in nuclear reactors, used to maintain the desired state of fission reactions. Among potential materials for this application, RE₂Hf₂O₇ compounds exhibit exceptional neutron absorption capacity and structural stability under prolonged radiation exposure, minimizing the risk of reduced neutron absorption efficiency. Herein, dense RE₂Hf₂O₇ ceramics (RE = Eu, Gd, Tb, Dy, Tm) were synthesized via vacuum solid-state reactive sintering. Structural analysis revealed distinct phase formations: Eu₂Hf₂O₇, Gd₂Hf₂O₇, and Tb₂Hf₂O₇ crystallized in the pyrochlore structure, while Dy₂Hf₂O₇ and Tm₂Hf₂O₇ adopted a defective fluorite configuration. The thermophysical properties of these ceramics were systematically evaluated. RE₂Hf₂O₇ demonstrated superior thermal conductivity (1.4-2.4 W·m⁻¹·K⁻¹, 298–1073 K) compared to the conventional material Dy₂TiO₅. Furthermore, their thermal expansion coefficients (6.0–10.5 × 10⁻⁶ K⁻¹, 350–1100 K) closely matched those of Dy₂TiO₅ (7.5–10.5 × 10⁻⁶ K⁻¹), ensuring compatibility in reactor environments. Mechanical testing indicated robust performance, with Vickers hardness values ranging from 12.6 to 14.9 GPa, attributed to high bulk density and enhanced atomic bond strength. This work highlights the feasibility of tailoring RE₂Hf₂O₇ ceramics through rare-earth and hafnium composition adjustments, offering a pathway to durable, high-performance neutron absorbers. The combined thermal, mechanical, and structural advantages position these materials as promising candidates for next-generation nuclear reactor control rods.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Defect formation and migration in zirconium carbide under charge variation: A first-principles study","authors":"Jie Liu,&nbsp;Xuan Song,&nbsp;Qi An","doi":"10.1111/jace.20689","DOIUrl":"https://doi.org/10.1111/jace.20689","url":null,"abstract":"<p>Zirconium carbide (ZrC), a high-performance refractory ceramic, exhibits complex defect dynamics that critically influence its behavior in extreme environments. In this work, we employ density functional theory (DFT) simulations to determine the formation energies and migration barriers of four defect types—isolated carbon vacancies, divacancies, Frenkel pairs, and Schottky pairs—across various charge states. The calculated formation energies reveal that isolated carbon vacancies are the most energetically favorable (1.13 eV), followed by Frenkel pairs (3.29 eV), while divacancies (6.86 eV) and Schottky pairs (8.29 eV) require higher formation energies, indicating their lower intrinsic concentrations. Isolated carbon vacancies exhibit the highest migration barrier (4.11 eV) in ZrC, with a modest increase to 4.13 eV upon adding one electron to 64-atom supercell and a decrease to 4.06 eV with two electrons/64-atom supercell—reflecting charge redistribution that stabilizes the local environment and weakens nearby Zr–C bonds. In contrast, Frenkel and Schottky pairs show barrier increases with electron doping and decreases with holes (ranging from 3.26 to 3.44 eV and 3.37 to 3.73 eV, respectively), while divacancies display increases (carbon vacancies: 2.69 to 2.93 eV; zirconium vacancies: 3.60 to 3.69 eV) upon electron addition. These results reveal the defect-specific impact of charge carriers on mobility in ZrC, offering key insights for optimizing its performance in extreme environments.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20689","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced piezoelectric performance and depolarization temperature in BiFeO3‒BaTiO3 piezoelectric ceramics","authors":"Huitao Guo,&nbsp;Yuxin Chen,&nbsp;Chaoyu Hao,&nbsp;Hongji Zhang,&nbsp;Bowen Wang,&nbsp;Jia Li,&nbsp;Yuanqing Ge,&nbsp;Guifen Fan,&nbsp;Fangfang Zeng","doi":"10.1111/jace.20687","DOIUrl":"https://doi.org/10.1111/jace.20687","url":null,"abstract":"<p>In recent years, bismuth ferrite-based (BiFeO₃‒BaTiO₃) lead-free piezoelectric ceramics have garnered extensive research attention. This is attributed to their high Curie temperature, rendering them promising candidates for high-temperature piezoelectric device applications. Nevertheless, attaining synergistic piezoelectric performance within BiFeO₃‒BaTiO₃ ceramics remains a formidable challenge. In this study, BiGaO₃ was incorporated into the BiFeO₃‒BaTiO₃ matrix. A systematic investigation and discussion were carried out regarding the phase structures, microstructures, ferroelectric properties, piezoelectric properties, and dielectric properties of the fabricated materials. The synthesized ceramics were deliberately engineered to establish a rhombohedral and pseudo-cubic phase boundary, which serves as a fundamental prerequisite for enhancing piezoelectric properties. Due to the synergistic impacts of appropriate BiGaO₃ doping, the 0.69BFG_0.025‒0.31BT ceramics achieved favorable piezoelectric performance characteristics, including a piezoelectric coefficient (<i>d</i>₃₃) of 254 pC/N, a Curie temperature of 472°C, and a high depolarization temperature of 545°C. These results affirm that this material holds great potential for applications in high-temperature piezoelectric devices.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The structural evolution and chemical durability of the CaZr1-xSmxTi2-xNbxO7 defect fluorite-derived ceramics","authors":"Yanhao Song,&nbsp;Xiuhua Ji,&nbsp;Kui Tang,&nbsp;Yihao Zhang,&nbsp;Tongshen Xu,&nbsp;Shiyin Ji,&nbsp;Tao Duan","doi":"10.1111/jace.20693","DOIUrl":"https://doi.org/10.1111/jace.20693","url":null,"abstract":"<p>Zirconolite and pyrochlore are recognized as the promising candidates for HLW immobilization because of their excellent chemical durability, radiation resistance and so on. In this study, the nominal CaZr_1-<i>_x</i>Sm<i>_x</i>Ti_2-<i>_x</i>Nb<i>_x</i>O₇ (<i>x </i>= 0.1–1.0) compounds were synthesized to explore their microstructure, phase evolution and chemical durability. The X-ray diffraction (XRD), back-scattered scanning electron microscopy with energy dispersive X-Ray spectrometry (BSEM-EDS) and Raman analysis results displayed that the phase transformation was two-layer to four-layer monoclinic zirconolite (2M to 4M) and then to cubic pyrochlore with concentration of Sm³⁺ and Nb⁵⁺ raising. The crystalline structure evolution of 2M to 4M zirconolite and zirconolite-4M to cubic pyrochlore were determined firstly at <i>x </i>= 0.2 and <i>x </i>= 0.3 sample, respectively. Zirconolite-4M with trace perovskite was prepared at <i>x </i>= 0.2 sample. Near single-phase pyrochlore would be obtained when <i>x</i> ≥ 0.4. Moreover, the chemical durability of zirconolite-4M was stronger than zirconolite-2M and the composite of zirconolite-4M and pyrochlore. The findings could be helpful for the design of zirconolite-based waste forms for actinides such as Np³⁺, Am³⁺, and others.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Densification of hard β-boron based ceramics by spark plasma sintering at larger heating rate","authors":"Zhengang Xiong,&nbsp;Ji Zou,&nbsp;Haibin Ma,&nbsp;Wei Ji,&nbsp;Weimin Wang,&nbsp;Zhengyi Fu","doi":"10.1111/jace.20679","DOIUrl":"https://doi.org/10.1111/jace.20679","url":null,"abstract":"<div>\u0000 \u0000 <p>The densification process of β-boron via spark plasma sintering (SPS) with controlled heating rates (50–300°C/min) was investigated at different temperatures from 1000°C to 1800°C. Systematic characterization reveals that enhanced heating rates (300°C/min) effectively suppress the volatilization of B₂O₃ impurities, promoting in situ formation of boron-rich oxide (B₆O) through reactions between boron and B₂O₃. The amount of the retained B₆O phase in the boron matrix increased with heating rates, which effectively accelerate the densification behavior of boron  , achieving near-full density (2.33 g/cm³) with residual porosity &lt; 0.3% in consolidated boron ceramics. Resultant ceramics demonstrate good combination of properties, including high Vickers hardness (31.0 ± 1.8 GPa at 9.8 N) and low thermal conductivity (13.8 W·m⁻¹·K⁻¹ at room temperature and 5.8 W·m⁻¹·K⁻¹ at 873 K), the latter was governed by intensified phonon–phonon scattering with less contributions from electrons (&lt; 1‰).</p>\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low thermal conductivity and enhanced thermal cycling performance of (Sm0.2Gd0.2Dy0.2Er0.2Yb0.2)2Zr2O7 coating","authors":"Yali Yu,&nbsp;Yang Lu,&nbsp;Guanghua Liu,&nbsp;Jian Sun,&nbsp;Wei Liu,&nbsp;Yuxian Cheng,&nbsp;Xiangyang Liu,&nbsp;Wei Pan,&nbsp;Chunlei Wan","doi":"10.1111/jace.20629","DOIUrl":"https://doi.org/10.1111/jace.20629","url":null,"abstract":"<p>In this work, the thermal performance of the high-entropy (Sm_0.2Gd_0.2Dy_0.2Er_0.2Yb_0.2)₂Zr₂O₇ (HEFO) coating was evaluated. The as-sprayed HEFO coating exhibited a significantly lower initial thermal conductivity of &lt;0.80 W·m⁻¹·K⁻¹, almost half of that of the conventional yttria-stabilized zirconia (YSZ) coating (∼1.2 W·m⁻¹·K⁻¹). When subjected to prolonged sintering at 1300°C for 40 h, the thermal conductivity of the HEFO coating gradually increased to ∼1.1 W·m⁻¹·K⁻¹ at 1200°C. Moreover, the HEFO coating demonstrated a thermal expansion coefficient of approximately 11 × 10⁻⁶ K⁻¹, which aligns with that of YSZ coatings. The HEFO coating showed improved durability during thermal cycling tests at 1100°C in air, and its lifetime was 919 cycles. The improvement can be attributed to the excellent phase stability and chemical compatibility.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simultaneous enhancement of fracture toughness and low-temperature degradation resistance via gradient-distributed stabilizers in zirconia","authors":"Jianxiao Ma,&nbsp;Ming Guan,&nbsp;Mingxin Huang","doi":"10.1111/jace.20692","DOIUrl":"https://doi.org/10.1111/jace.20692","url":null,"abstract":"<p>The addition of more metal oxide stabilizers with low-valent or large-sized cations is the most effective way to enhance the resistance ability of tetragonal zirconia (t-ZrO₂) to low-temperature degradation (LTD). However, transformation toughening will be weakened due to the increased strain energy required to induce the monoclinic phase (m-ZrO₂) with lower volume expansion at the crack tip. Consequently, the resistance to LTD would be achieved at the expense of reduced fracture toughness. In this study, we have successfully improved both fracture toughness and LTD resistance of zirconia simultaneously by introducing residual compressive stress through gradient-distributed stabilizer (MgO) or second phase (Al₂O₃). A cost-effective method was employed to achieve controllable surface enrichment of stabilizers by utilizing evaporated metal-chloride solutions in porous zirconia followed by a simple pressureless sintering process. Importantly, this approach offers a universal strategy for maintaining functionality and mechanical properties simultaneously in scenarios involving inevitable adverse metallurgical interactions between functional dopants and the matrix.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation on stress rupture life of C/SiC under wet oxygen condition","authors":"Guoqing Chen,&nbsp;Leijiang Yao,&nbsp;Lijun Zhang,&nbsp;Bin Li,&nbsp;Xiaoyan Tong","doi":"10.1111/jace.20703","DOIUrl":"https://doi.org/10.1111/jace.20703","url":null,"abstract":"<p>Stress oxidation, accompanied by a complex coupling process between thermal, stress, and chemical reactions, is one of the primary failure types of C/SiC thermal structures. To predict the rupture life of C/SiC, a finite element analysis (FEA) model was established on a representative volume element (RVE) extracted from the periodic structure of plain weave C/SiC. Considering the diffusion mechanism of the oxidizing atmosphere and the oxidation kinetics of carbon fibers, an oxidation damage variable was defined. The FEA model accounts for both stress failure and oxidation damage of the carbon fiber bundles. Stress rupture lifetimes under the conditions of different stress levels and temperatures were predicted. The comparison between simulation results and experimental results proves the reliability of the proposed model. The competition mechanism between diffusion and oxidation was also discussed.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}