Journal of the American Ceramic Society最新文献

{"title":"Effect of Fe/Al ratio on electronic structure and mechanical properties of Ca2AlxFe2−xO5","authors":"Neng Li,&nbsp;Tingting He,&nbsp;Zhongyong Zhang,&nbsp;Junhao Shuai,&nbsp;Deyong Zhou,&nbsp;Jiayu Yue,&nbsp;Xiao Zhi,&nbsp;Jiayuan Ye,&nbsp;Fujie Jia,&nbsp;Fazhou Wang","doi":"10.1111/jace.20533","DOIUrl":"https://doi.org/10.1111/jace.20533","url":null,"abstract":"<p>Ca₂Al<i>_x</i>Fe₂₋<i>_x</i>O₅ is a key constituent of high-iron, low-calcium (high ferrite cement) cement, which has broad applications in bridges, marine engineering, and other harsh environments. It is crucial to understand the mechanical properties of Ca₂Al<i>_x</i>Fe₂₋<i>_x</i>O₅ for assessing the strength and durability of C₄AF in real-world scenarios, which are vital for ensuring the quality and safety of engineering structures. The Fe/Al molar ratio directly influences the microstructure and mechanical behavior of Ca₂Al<i>_x</i>Fe₂₋<i>_x</i>O₅, but the mechanical properties of Ca₂Al<i>_x</i>Fe₂₋<i>_x</i>O₅ series solid solutions are scarcely investigated experimentally. In this work, first-principles calculations were employed to examine the electronic structure, bonding, and mechanical properties of five solid solutions, specifically Ca₂Al₂O₅, Ca₂Fe_0.5Al_1.5O₅, C₄AF-<i>I</i>, Ca₂Fe_1.5Al_0.5O₅, and Ca₂Fe₂O₅, were investigated in this study. It was found that a high ratio of Fe/Al solid solution can negatively impact the strength and stiffness of Ca₂Al<i>_x</i>Fe₂₋<i>_x</i>O₅ solid solution. These results provide a theoretical foundation for designing high-strength offshore concrete engineering that uses low-calcium, high-iron cement as its primary component.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 7","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897269","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":"Thermodynamic modeling of the Ta–N–O system","authors":"Niraja Moharana,&nbsp;Ravi Kumar,&nbsp;Ryo Maezono,&nbsp;K. C. Hari Kumar","doi":"10.1111/jace.20521","DOIUrl":"https://doi.org/10.1111/jace.20521","url":null,"abstract":"<p>In this work, we report the thermodynamic modeling of the Ta–N–O system using the Calphad approach combined with <i>ab initio</i> calculations and experiments. The formation enthalpies of stable and certain metastable compounds of the Ta–N and Ta–N–O systems were computed using the density functional theory (DFT) to serve as inputs for the Gibbs energy modeling. The DFT study has confirmed <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>Ta</mi>\u0000 <mn>3</mn>\u0000 </msub>\u0000 <msub>\u0000 <mi>N</mi>\u0000 <mn>5</mn>\u0000 </msub>\u0000 </mrow>\u0000 <annotation>${rm Ta}_3 {rm N}_5$</annotation>\u0000 </semantics></math> as an equilibrium phase. Hence, this phase is included as a stable phase in the Gibbs energy modeling of the Ta–N system. Wherever feasible, we have performed phonon calculations to estimate the heat capacities of compounds. The heat capacities of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>Ta</mi>\u0000 <mn>3</mn>\u0000 </msub>\u0000 <msub>\u0000 <mi>N</mi>\u0000 <mn>5</mn>\u0000 </msub>\u0000 </mrow>\u0000 <annotation>${rm Ta}_{3} {rm N}_5$</annotation>\u0000 </semantics></math> and TaON were measured using a differential scanning calorimeter. It is observed that <span></span><math>\u0000 <semantics>\u0000 <mi>θ</mi>\u0000 <annotation>$utheta$</annotation>\u0000 </semantics></math>-TaN, a high-pressure polymorph of <span></span><math>\u0000 <semantics>\u0000 <mi>ε</mi>\u0000 <annotation>$uepsilon$</annotation>\u0000 </semantics></math>-TaN, stabilizes at atmospheric pressure with oxygen substitution. The thermochemical data obtained in the present work are combined with carefully selected thermochemical and constitutional data from the literature to obtain the Gibbs energy descriptions of the Ta–N and Ta–N–O systems.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 7","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897253","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":"Cytocompatible, radiopaque, and antibacterial bismuth-doped gel-derived 58S bioactive glasses","authors":"Glauber R. C. Cerqueira,&nbsp;José F. B. Rodrigues,&nbsp;Adam Shearer,&nbsp;José F. Schneider,&nbsp;Maria V. O. Dantas,&nbsp;Fábio C. Sampaio,&nbsp;Paula L. Nogueira,&nbsp;Ricardo D. Castro,&nbsp;John C. Mauro,&nbsp;Marcus V. L. Fook,&nbsp;Maziar Montazerian","doi":"10.1111/jace.20516","DOIUrl":"https://doi.org/10.1111/jace.20516","url":null,"abstract":"<p>Larry L. Hench's research group first introduced gel-derived bioactive glasses (BGs) in 1991. These BGs offer a broader range of bioactivity than traditional melt-derived BGs. Highly porous gel-derived glasses are suitable for various applications, such as bone and soft tissue engineering. The sol–gel process has significant versatility in developing BGs, and recent studies have investigated new compositions, including 58S glass (60SiO₂–36CaO–4P₂O₅ mol%) modified with metal oxides. The addition of bismuth to BGs has recently been studied to enhance radiopacity, antibacterial properties, and effectiveness in cancer therapy. We investigated the effects of bismuth addition on the structural and biological properties of 60SiO₂–(36 − <i>x</i>)CaO–4P₂O₅–<i>x</i>Bi₂O₃ (<i>x</i> = 0, 0.5, 1, 1.5 mol%) gel-derived glasses. The glasses were prepared by hydrolysis and polycondensation of tetraethyl orthosilicate, triethyl phosphate, Ca(NO₃)₂·4H₂O, and Bi(NO₃)₃·5H₂O. They were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, differential thermal analysis/thermogravimetry, and nuclear magnetic resonance after successfully converting the gels to glass at 600°C. The in vitro bioactivity, cytotoxicity, antimicrobial activity, and radiopacity of all samples were then analyzed. We found that glasses with 0.5, 1, and 1.5 mol% bismuth can be synthesized via a simple sol–gel route. In vitro tests confirmed that hydroxycarbonate apatite covers the surface of glass particles after 24 h of immersion in simulated body fluid. An in vitro biocompatibility assay demonstrated that the new materials are non-cytotoxic and antibacterial against <i>Escherichia coli</i>. Furthermore, the glass doped with 1.5 mol% of bismuth exhibited radiopacity equivalent to a 3.05 mm aluminum scale, meeting the standard limit.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 7","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20516","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897254","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":"Full solar spectrum responsive carbon nitride enabled by low-temperature molten-salt-assisted magnesiothermic reduction","authors":"Yifeng Xu,&nbsp;Xipeng Xin,&nbsp;Hexige Wuliji,&nbsp;Kai Ye,&nbsp;Qingdong Liu,&nbsp;Yiqiu Zhu,&nbsp;Kunpeng Zhao,&nbsp;Yang Ren,&nbsp;Xuefeng Song,&nbsp;Lian Gao","doi":"10.1111/jace.20525","DOIUrl":"https://doi.org/10.1111/jace.20525","url":null,"abstract":"<p>The solar energy conversion efficiency of graphitic carbon nitride (GCN)-based photocatalysts is significantly hindered by the limited intrinsic absorption range and low carrier mobility of GCN. Herein, a novel carbon nitride (SC-CN) with exquisitely designed electronic band structure is proposed by continual stoichiometric manipulation, introducing wide dispersed midgap states for stepwise electron excitation. Importantly, the modulation of electronic structure paves the way for multilevel electron transitions, resulting in the full solar spectrum absorption covering a range of 250–2500 nm. Moreover, these defect levels markedly enhance the nonradiative relaxation in SC-CN, leading to a distinct photothermal effect where its temperature can be raised to 80°C under 100 mW cm⁻² near-infrared (NIR) light. Ultimately, a full solar conversion improvement for microcystin photoredox degradation is realized due to the synergetic interaction of photothermal effect and interfacial charge transfer in an SC-CN@GCN heterojunction.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 7","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897261","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":"Effects of B-site doping and stoichiometry on strontium ferrate Sr0.85Ce0.15FexCoyO3 perovskites as electrocatalysts","authors":"Maria Laura Tummino,&nbsp;Leonarda Francesca Liotta,&nbsp;Massimiliano Lo Faro,&nbsp;Sabrina Campagna Zignani,&nbsp;Francesca Deganello","doi":"10.1111/jace.20528","DOIUrl":"https://doi.org/10.1111/jace.20528","url":null,"abstract":"<p>SrFeO₃-based oxides are multi-functional ceramics belonging to the ABO₃-type perovskite family, where iron is interestingly present at the B-site as Fe⁴⁺ and partially reducible to Fe³⁺ by doping strategies to tailor the physical–chemical properties. When doped, fine-tuned SrFeO₃ is exploitable in novel energy production systems, for example, electrocatalysts in intermediate temperature solid oxide fuel cells (IT-SOFCs). This work aimed to evaluate how the B-site composition and stoichiometry affect the functional properties of SrFeO₃-based materials when A-site doping with cerium is fixed at 15 mol%. Hence, powdered samples were prepared by solution combustion synthesis, modulating the Fe/Co ratio or the B-site stoichiometry (Fe + Co). From an in-depth characterization, it was found that both B-site nonstoichiometry and Fe/Co ratio influenced structure, redox properties, and electrochemical behavior. Still, nonstoichiometry played a major role in improving oxygen adsorption capacity and mobility, also thanks to the contribution of the segregated phases (CeO₂, Sr₃Fe₂O₇₋<i>_δ</i>) generated by the induced B-site unbalancing. The nonstoichiometric sample reached the highest oxygen reduction capability at the IT-SOFC operating temperature (600°C) and the lowest activation energy (0.65 eV), whereas the cobalt-rich sample showed poorer performance as an oxygen electrode. These results encourage further research on tunable cobalt-poor and nonstoichiometric perovskites in energy-related devices.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 7","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20528","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897255","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":"Grain boundary mobility transition in alumina","authors":"Shuai Li,&nbsp;Wenqiang Wu,&nbsp;Yao Han,&nbsp;Wei Sun,&nbsp;Lixia Li,&nbsp;Yanhao Dong,&nbsp;Chang-An Wang","doi":"10.1111/jace.20537","DOIUrl":"https://doi.org/10.1111/jace.20537","url":null,"abstract":"<p>Alumina is a classical model system to study the mass transport, sintering, and microstructural evolution of ceramics. It is known to have strong crystal anisotropy and abnormal grain growth, that is, abnormally accelerated grain boundary mobility of a single or some grain boundaries leading to fast growth of some grains in consumption of their neighboring grains. Here, we reported another phenomenon in pressurelessly sintered fine-grain alumina at relatively low temperatures. Statistically averaged grain boundary mobilities of alumina between 1300°C and 1500°C were systematically calculated in the normal parabolic growth regime and sample microstructure with weak anisotropy. While the higher temperature data at 1400–1500°C with a reasonably activation energy of 4.9 eV agree well with extrapolated ones from Dillon and Harmer, the lower temperature data at 1300–1400°C show rapid slowdown with a very large apparent activation energy of 9.0 eV. Previously, such grain boundary mobility transition was only reported in cubic yttria-stabilized zirconia and body-centered cubic tungsten, both with high symmetric and low anisotropy. The new report of similar phenomenon in high-anisotropy alumina system suggests a general feature of grain boundary mobility quenching at low temperatures and a sweet processing window to sinter fine ceramics with extrinsically controlled microstructure, properties, and reliability.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 7","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897258","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 Al2O3/SiO2 ratio on yttrium aluminosilicate glass: Structure, thermal, mechanical, acid resistance properties","authors":"Xianzi Li,&nbsp;Yanhang Wang,&nbsp;Penghui Yang,&nbsp;Tao Han,&nbsp;Bin Han","doi":"10.1111/jace.20513","DOIUrl":"https://doi.org/10.1111/jace.20513","url":null,"abstract":"<p>Yttrium aluminosilicate glass with high alkali metal oxides content provides an excellent foundation for ion exchange to achieve high-strength glass preparation. Nevertheless, poor acid resistance limits its application under extreme acidic conditions. This study investigates the effects of Al₂O₃/SiO₂ ratios on the structure, acid resistance, thermal, and mechanical properties of glass. Experimental results reveal that Vickers hardness, elastic modulus, glass transition temperature, and expansion softening point temperature increase with the increase of Al₂O₃ content. Notably, there is a consistent relationship between the change in bridge oxygen ratio and the coefficient of thermal expansion. The glass network structure was optimized by adjusting the Al₂O₃/SiO₂ ratio, and the apparent quality of glass remained undamaged after being corroded by 6 mol/L hydrochloric acid for 6 h. In addition, the influence of network connectivity on the two-step ion exchange efficiency was explored and the bending strength was increased to 719 MPa.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 7","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897235","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":"Thermally induced optical coding and encryption based on Y2W3O12:Tb3+/Eu3+ ceramics","authors":"Xiyuan Chen,&nbsp;Quanwang Niu,&nbsp;Peiqing Cai,&nbsp;Xiangfu Wang","doi":"10.1111/jace.20518","DOIUrl":"https://doi.org/10.1111/jace.20518","url":null,"abstract":"<div>\u0000 \u0000 <p>Recent advances in inorganic negative thermal expansion (NTE) materials have highlighted their potential for multifunctional applications, yet challenges remain in optimizing their luminescent properties for practical use. Based on Y₂W₃O₁₂:Tb³⁺/Eu³⁺ NTE ceramics, we present a thermally regulated optical encoding and encryption approach. Under 254 nm UV excitation, the distinctive high-temperature thermal enhancement effect of red emission and the thermal quenching phenomenon of green emission were discovered in these ceramics, enabling an effective temperature-controlled color change phenomenon. Optical information encoding and readout were realized through the synergistic modulation effect of UV light and heat, and the encryption and decoding process of multivariate codes and alphabets at high temperatures was accomplished. The encoding was accomplished by modulating the Tb³⁺/Eu³⁺ doping concentration ratio and regulating the luminescent color of the ceramics over a wide range. Furthermore, the ceramic demonstrates a wide temperature range of 363‒603 K for temperature sensing effect. This offers a research idea for achieving multifunctional ceramics of coding and temperature sensing.</p>\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 7","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896876","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":"Improvement of mechanical strength of piezoelectric ceramics embedded in aluminum matrix","authors":"Tetsuro Yanaseko,&nbsp;Hiroshi Sato,&nbsp;Fumio Narita,&nbsp;Hiroshi Asanuma","doi":"10.1111/jace.20514","DOIUrl":"https://doi.org/10.1111/jace.20514","url":null,"abstract":"<p>Piezoelectric ceramics were integrated into an aluminum matrix to enhance their strength. The strength, obtained via a three-point bending test conducted both pre- and postembedding the piezoelectric ceramics, was analyzed using a Weibull distribution. The analysis aimed to provide a quantitative assessment of the strength augmentation. The Weibull modulus increased from 4.30 to 5.96, while the scale parameter rose from 125.1 to 167.8 MPa. Notably, a distinct inflection point emerged in the Weibull plot of the composite piezoelectric ceramics, indicating a shift in the fracture mode. This transition in fracture mode is attributed to matrix yielding, a conjecture supported by the Weibull modulus aligning with the Weibull modulus of strength at the yield. The microstructures of the composites emerged as pivotal factors that influenced the fracture mode transition. Microstructural defects at the interface contributed to reducing the interfacial strength, which induced differences in fracture modes.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 7","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143897256","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":"Evaluation of characterization techniques for selecting kaolinitic clays as supplementary cementitious materials: An interlaboratory study","authors":"Mehnaz Dhar,&nbsp;Tafadzwa Ronald Muzenda,&nbsp;Yannick Demeusy,&nbsp;Anastasia Koutsouradi,&nbsp;Peter Arendt Jensen,&nbsp;Christophe Labbez,&nbsp;Shashank Bishnoi,&nbsp;Fabien Georget,&nbsp;Thomas Matschei","doi":"10.1111/jace.20512","DOIUrl":"https://doi.org/10.1111/jace.20512","url":null,"abstract":"<p>Calcined clays are a crucial asset to decarbonize the cement industry. Still, the natural variation of the composition of the clays means that each clay needs to be assessed for its suitability to be activated and used as a supplementary cementitious material (SCM). This paper analyzes a potential minimum characterization workflow to screen clays based on mineralogical and physical properties so as to predict their potential performance after activation in cements. We investigate and discuss various characterization techniques (x-ray fluorescence, thermogravimetric analysis, x-ray diffraction, and infrared spectroscopy) to assess the physical, chemical, and mineralogical properties of nine raw clay samples of industrial interest at four different laboratories. The results show that although XRF and TGA are important to obtain a first assessment of the clays, a mineralogy study is necessary to assess the order of crystallinity of the clays, the presence of 2:1 clay minerals, and other minerals that impact both the activation process and the performance of the activated clay as an SCM.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 7","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896871","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}