Journal of the American Ceramic Society最新文献

{"title":"Zhaozhou Bridge inspired embedded material extrusion 3D printing of Csf/SiC ceramic matrix composites","authors":"Wenqing Wang,&nbsp;Xiong Gao,&nbsp;Xiaotong Chen,&nbsp;Anna De Marzi,&nbsp;Kai Huang,&nbsp;Rujie He,&nbsp;Paolo Colombo","doi":"10.1111/jace.20644","DOIUrl":"https://doi.org/10.1111/jace.20644","url":null,"abstract":"<p>Material extrusion (MEX) 3D printing, while effective for many applications, faces challenges in fabricating arch shapes and suspended structures. This study advances MEX technology by drawing inspiration from ancient bridge construction techniques like the Zhaozhou Bridge, using an innovative embedded material extrusion (EMEX) method that eliminates the need for additional support structures in fabricating complex short carbon fiber reinforced SiC ceramic matrix composites (C_sf/SiC CMCs). Utilizing solid powders as a supporting medium, EMEX enables the creation of intricate arch shapes and suspension structures, overcoming limitations associated with conventional MEX. The impact of supporting media (SiC powders and sugar) on the microstructure and mechanical properties of the composites was demonstrated. Residual SiC powders caused uneven material distribution, while residual sugar led to cracking. The presence of residual powders also influenced the shrinkage behavior and bending strength of the C_sf/SiC CMCs, with a notable decrease observed when transitioning from air to SiC powders and then to sugar as the printing environment. The successful fabrication of C_sf/SiC CMCs with complex geometries using EMEX indicates its potential as a promising supportless strategy for producing sophisticated CMC structures.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144536933","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":"Garnet infrared windows","authors":"Brahim Akdim,&nbsp;John W. Drazin,&nbsp;Andrew Schlup,&nbsp;Randall S. Hay,&nbsp;Seamus McGarvey,&nbsp;Augustine Urbas,&nbsp;Jared H. Delcamp","doi":"10.1111/jace.20606","DOIUrl":"https://doi.org/10.1111/jace.20606","url":null,"abstract":"<p>The infrared (IR) transparency of garnets and cubic antimonates, with a structure similar to garnet, were determined by density functional theory (DFT) calculations. The maximum frequency at the Brillouin zone center was scaled by a factor of 2 to determine IR cutoff. DFT calculations for bulk modulus and bandgap were also done. The calculations were compared with transparency determined from digitized Fourier-transform infrared (FTIR) spectra for powder and for bulk specimens. Trends for predictions from DFT calculations agree with those determined from FTIR and bulk spectra. Measurements of IR transmittance from room temperature to 1500°C were made for polycrystalline Y₃Al₅O₁₂ (YAG) and single-crystal Gd₃Ga₅O₁₂ (GGG) garnet. Optical, structural, thermodynamic, and thermophysical properties from literature data were collected for a variety of garnet compositions, and where possible, compared with DFT calculations. Garnets with the best combinations of properties for windows are discussed.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144536948","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":"Radiation behavior of Ruddlesden–Popper Srn+1TinO3n+1 (n = 1, 2, 3, and ∞): Effects of layered structure and temperature","authors":"Menghui Wang,&nbsp;Liangfu Zhou,&nbsp;Huashuai Hu,&nbsp;Fenghua Shen,&nbsp;Shijian Lin,&nbsp;Tongmin Zhang,&nbsp;Yuhong Li,&nbsp;Dongyan Yang","doi":"10.1111/jace.20612","DOIUrl":"https://doi.org/10.1111/jace.20612","url":null,"abstract":"<p>Ruddlesden–Popper (RP) perovskites are layer-structured derivatives of simple perovskites. In this study, the radiation behavior of RP perovskites Sr<i>_n</i>₊₁Ti<i>_n</i>O₃<i>_n</i>₊₁ (<i>n</i> = 1, 2, 3, and ∞) was investigated, focusing on the effects of [SrO] layers and temperatures. Under 3 MeV Xe ion irradiation at room temperature, Sr<i>_n</i>₊₁Ti<i>_n</i>O₃<i>_n</i>₊₁ perovskites exhibited varying degrees of amorphization and lattice swelling. As the index <i>n</i> increases or the density of [SrO] layers decreases, the radiation resistance of Sr<i>_n</i>₊₁Ti<i>_n</i>O₃<i>_n</i>₊₁ gradually increases, suggesting that the [SrO] layers play a significant role in the radiation behavior of RP perovskites. At high temperatures, Sr<i>_n</i>₊₁Ti<i>_n</i>O₃<i>_n</i>₊₁ perovskites exhibited enhanced radiation tolerance. Moreover, the typical layered Sr<i>_n</i>₊₁Ti<i>_n</i>O₃<i>_n</i>₊₁ (<i>n</i> = 1–3) perovskites decomposed into non-layered SrTiO₃ and SrO. To further elucidate these observations, annealing experiments were performed on pristine and room-temperature irradiated samples. The results confirm that the phase decomposition is caused by a combined effect of irradiation and high temperature. On the basis of the first-principles calculations, the experimental results are well interpreted within the framework of defect energetics and thermodynamic stability. This study provides insights into the mechanism governing the structural stability of RP perovskites under radiation, offering guidance for tuning the radiation resistance of complex materials.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537159","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":"Preparation of freestanding films using Pr-doped CaSrTiO3 nanoparticles prepared by supercritical hydrothermal synthesis","authors":"Hiroshi Takashima,&nbsp;Kiwamu Sue","doi":"10.1111/jace.20637","DOIUrl":"https://doi.org/10.1111/jace.20637","url":null,"abstract":"<p>We developed a paste of praseodymium-doped calcium strontium titanium oxide perovskite phosphor nanoparticles prepared by supercritical hydrothermal synthesis and successfully prepared freestanding films using simple screen printing. In addition, when investigating the luminescence properties of the obtained films and sintered freestanding films, we observed a strong luminescence corresponding to a wavelength of 612 nm. The development of freestanding film phosphors using nanoparticles as raw materials will greatly contribute to the promotion of electroluminescent device development, given that the film thickness can be freely controlled.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537157","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":"Preparation and properties of Dion–Jacobson-type perovskite CsA2Nb3O10 (A = Ca, Sr, Ba) crystals and ceramics by the molten salt method","authors":"Yifan Li,&nbsp;Jingyang Wang,&nbsp;Yu Wang,&nbsp;Shuang Cao,&nbsp;Zhenyu Han,&nbsp;Meng Zhang,&nbsp;Lei Zhang","doi":"10.1111/jace.20611","DOIUrl":"https://doi.org/10.1111/jace.20611","url":null,"abstract":"<p>Dion–Jacobson-type (DJ-type) perovskite CsA₂Nb₃O₁₀ (A = Ca, Sr, Ba) is a compound that can simultaneously accommodate Cs⁺ and A²⁺ ions and thus considered as a potential immobilization matrix for radionuclides ¹³⁷Cs and ⁹⁰Sr. In this work, using A²⁺ to simulate bivalent alkaline earth metals, CsA₂Nb₃O₁₀ single crystals were synthesized by the molten salt method. CsA₂Nb₃O₁₀ has good thermal stability up to 900°C. At the same time, CsA₂Nb₃O₁₀ has strong radiation resistance, with most crystals maintain their initial morphology with slight color change. Cations with smaller radii, for example, Na⁺, K⁺, and Rb⁺, do not replace Cs⁺ in the interlayer of CsA₂Nb₃O₁₀ and A²⁺ in the NbO₆ polyhedron. CsA₂Nb₃O₁₀ demonstrates a wide range of pH durability, where its frame structure remains stable in the pH range from 2 to 12 and will not be decomposed, while Cs⁺ in CsA₂Nb₃O₁₀ loses more into the solution at the pH range from 2 to 4 and from 10 to 12, and the loss of Sr²⁺ and Ba²⁺ is much lower than that of Ca²⁺ due to slight differences in the framework structure. Further sintering of CsCa₂Nb₃O₁₀ and CsSr₂Nb₃O₁₀ result in high density ceramic with a relative density of 94%–97%, along with improved chemical stability. According to the investigation of the surface morphology and elemental chemical state, it can be confirmed that Cs, A, and Nb elements are uniformly distributed on the surface of ceramics. The normalized leaching rates of Cs, Ca, and Sr in the CsCa₂Nb₃O₁₀ and CsSr₂Nb₃O₁₀ ceramic waste forms are about 1, 1, and 10⁻⁴ to 10⁻³ g·m⁻²·d⁻¹ after 28 days, respectively.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537160","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":"Enhanced domain dynamics in alternating current poled rhombohedral Pb(Mg1/3Nb2/3)O3–PbTiO3 single crystals","authors":"Jeong-Woo Sun,&nbsp;Andrei Fluerasu,&nbsp;Zhengze Xu,&nbsp;Sipan Liu,&nbsp;Sang-Goo Lee,&nbsp;Wook Jo,&nbsp;Xiaoning Jiang,&nbsp;Jong Eun Ryu","doi":"10.1111/jace.20610","DOIUrl":"https://doi.org/10.1111/jace.20610","url":null,"abstract":"<p>The understanding of domain dynamics in ferroelectric materials is crucial for optimizing their performance in piezoelectric and electro-optic applications. Although previous studies have focused on static domain structures and macroscopic characteristics, the time-resolved approach of domains remains largely unexplored. In this study, we compare the dynamic responses of direct current (DC) and alternating current (AC) poled [001]-oriented rhombohedral Pb(Mg_1/3Nb_2/3)O₃–PbTiO₃ (PMN–PT) single crystals using X-ray photon correlation spectroscopy (XPCS) during the application of external electric fields. Our results demonstrate that the AC-poled sample exhibit enhanced reconfiguration of domain variants in response to driving fields compared to the DC-poled counterpart, as evidenced by accelerated correlation decay and faster relaxation time. This phenomenon is attributed to enhanced reversible domain wall motion achieved through AC poling, which facilitates field-induced domain realignment. These findings provide insight into the relationship between dynamics and macroscopic properties in relaxor-PT single crystals for high-performance applications.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20610","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537257","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":"Design of SPE-RFE state through Bi3+ substitution on CLT-modified NBT-6.5BT ceramics gaining enhanced energy density","authors":"G. C. Ancy,&nbsp;P. M. Priya Dharsini,&nbsp;B. Sundarakannan","doi":"10.1111/jace.20608","DOIUrl":"https://doi.org/10.1111/jace.20608","url":null,"abstract":"<p>The pursuit of environmentally sustainable, lead-free ceramics with outstanding energy storage capabilities is crucial for the advancement of next-generation high-power capacitors. However, achieving this objective comes with significant hurdles. In this investigation, we have developed a highly effective method for inducing the relaxor ferroelectric phase (RFE) within super paraelectric (SPE) materials, specifically in Bi³⁺-substituted NBT-BT-CLT ceramics. This innovation has resulted in an exceptional energy storage density of approximately 5.83 J cm⁻³ under an electric field of 320 kV/cm, coupled with an impressive efficiency rating of around 79%. The outstanding performance in energy storage can be largely attributed to the intentional manipulation of ultrasmall polar nanoregions, as confirmed through HRTEM analysis. This engineering approach not only reduces grain size but also significantly enhances polarization and raises the thresholds for the breakdown of electric fields. The SPE-RFE strategy demonstrated in this study holds broad applicability in optimizing dielectric properties and other essential functionalities, thereby facilitating the conceptualization of advanced energy storage devices.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537309","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":"Enthalpies of formation of pyrochlore Tb2Hf2O7 and fluorite RE2O3·2HfO2 (RE = Dy-Lu) rare-earth hafnates","authors":"Irina A. Bajenova,&nbsp;Anton V. Guskov,&nbsp;Pavel G. Gagarin,&nbsp;Alexandra V. Khvan,&nbsp;Vladimir N. Guskov,&nbsp;Konstantin S. Gavrichev","doi":"10.1111/jace.20598","DOIUrl":"https://doi.org/10.1111/jace.20598","url":null,"abstract":"<p>The enthalpies of formation of heavy rare-earth hafnates Tb₂Hf₂O₇ (pyrochlore structure) and RE₂O₃^.2HfO₂ (RE = Dy-Lu) (defect fluorite structure) have been determined by the method of oxide melt drop-solution calorimetry. The data obtained for Tb₂Hf₂O₇ revealed that they are in trend with previously experimentally determined values for “light” RE hafnates. The formation enthalpies of fluorite structured compounds in general become more positive with the RE ionic radius contraction. The values of enthalpy of formation from oxides for the fluorite solid solutions obtained in the current study are sufficiently more negative than was predicted by the ab initio calculations. The calculation of the Gibbs energy dependencies as well as the contribution of both entropy and enthalpy factors allowed us to estimate the stability of the compounds in the high-temperature range.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537256","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":"Optimizing the gradient pore distribution of YSZ coatings to achieve excellent thermal shock resistance","authors":"Yang Xiang,&nbsp;Nengmao Tan,&nbsp;Wenzhuang Ma,&nbsp;Juhang Yin,&nbsp;Tong Zhou,&nbsp;Peiheng Zhou,&nbsp;Li Zhang","doi":"10.1111/jace.20609","DOIUrl":"https://doi.org/10.1111/jace.20609","url":null,"abstract":"<p>Yttria-stabilized zirconia coatings, as thermal barrier coatings, require high bonding strength, low thermal conductivity and emissivity, and long thermal shock lifetime to provide superior long-term high-temperature protection for alloy substrates. Matched gradient pore YSZ coatings, featuring a low-porosity inner layer and a high-porosity outer layer, were designed by adjusting spray power during atmospheric plasma spraying and optimizing interlayer porosity gradients. The results showed that YSZ coatings with matched porosity gradients exhibited excellent bonding strength, moderate thermal conductivity, and infrared emissivity, alongside outstanding thermal shock resistance. The thermal shock lifetime exceeded 900 cycles at 1000°C, representing a nine-times improvement compared with conventional coatings. This enhancement in thermal shock resistance was attributed to the optimized porosity gradient design. The matched gradient effectively suppressed crack propagation during the early stages of thermal cycling promoted the formation of a dense Al₂O₃ layer at the interface and further inhibited the diffusion of Al into the coating.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537259","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":"Effect of sintering atmosphere on optical, mechanical, and thermal radiation performance of Y2O3–MgO composite ceramics","authors":"Xiaomeng Yin,&nbsp;Ming Qiang,&nbsp;Kai Li,&nbsp;Bingheng Sun,&nbsp;Kaichen Qian,&nbsp;Jia Tong,&nbsp;Yanna Tian,&nbsp;Jing Jia,&nbsp;Jintai Fan,&nbsp;Long Zhang","doi":"10.1111/jace.20594","DOIUrl":"https://doi.org/10.1111/jace.20594","url":null,"abstract":"<p>Y₂O₃–MgO composite nanopowders were prepared by sol–gel method, and Y₂O₃–MgO composite ceramics were prepared in oxygen (Y-M-O₂), air (Y-M-A), and vacuum (Y-M-V). The influence of the sintering atmosphere on the microstructure and properties of the Y₂O₃–MgO nanocomposite ceramics was examined. The findings indicate that sintering in a vacuum atmosphere enhances the concentration of oxygen vacancies in the ceramics, resulting in a marginal increase in their average grain size and consequently, an increase in density. Concurrently, the expulsion of internal pores leads to improved transmittance and hardness, while suppressing emissivity. Consequently, the microstructure, mechanical, optical, and thermal radiation performance of Y₂O₃–MgO nanocomposite ceramics are correlated with the concentration of oxygen vacancies, which can be manipulated by adjusting the sintering atmosphere. This research offers a viable strategy for enhancing the performance of Y₂O₃–MgO nanocomposite ceramics through simple control over the sintering atmosphere.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 9","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537261","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}