Journal of the American Ceramic Society最新文献

{"title":"Phase equilibria studies of the CaO–SbOx system in air","authors":"Shu Li,&nbsp;Wenjie Wei,&nbsp;Guangyu Wang,&nbsp;Zemeng Weng,&nbsp;Boya Zhang,&nbsp;Zhanmin Cao","doi":"10.1111/jace.20286","DOIUrl":"https://doi.org/10.1111/jace.20286","url":null,"abstract":"<p>The phase equilibria information of the CaO–SbO<i>_x</i> system in the range of 700–1580°C in air was obtained for the first time using quenching method and thermal analysis. The equilibrium phase compositions were determined using x-ray diffraction and Scanning Electron Microscopy-Energy Dispersion Spectrum. The invariant reaction temperatures were determined using thermogravimetry-differential scanning calorimetry. A perovskite solid solution between Ca₂Sb₂O₇ and CaO, designated as (Ca₆Sb₂O₁₁)_s.s, was observed. Within this solid solution, three polymorphic forms were identified: orthorhombic, tetragonal, and cubic. The transition temperatures between these polymorphic forms vary with compositional changes. Additionally, the crystal structure of cubic Ca₆Sb₂O₁₁ was analyzed. CaSb₂O₆ was observed to decompose into Ca₂Sb₂O₇, Sb₄O₆, and O₂ above 1336 ± 5°C. The eutectic temperature of α-Sb₂O₄ and CaSb₂O₆ was found to be 1220 ± 5°C.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 4","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115476","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":"Quantitative predicting physical and spectroscopic properties of silicate laser glasses using a phase diagram approach","authors":"Shuangli Dong,&nbsp;Weichao Wang,&nbsp;Qinyuan Zhang","doi":"10.1111/jace.20312","DOIUrl":"https://doi.org/10.1111/jace.20312","url":null,"abstract":"<p>Theoretical prediction of glass compositions with certain performance requirements is a long-standing challenge in glass research. The difficulty lies in revealing the relationship of glass's composition–structure–property (C–S–P), and establishing a predictive calculation method for glass properties with high accuracy. Here we determine quantitatively the C–S–P relationships of four silicate laser glasses using nearest-neighboring congruently melting compounds (CMCs) as “component and structural motifs”. For all studied silicate systems, physical properties such as density and refractive index are predicted with an error of less than 5%. Spectroscopic properties, including Judd–Ofelt parameters, fluorescence branching ratio (<i>β</i>), effective bandwidth (Δ<i>λ_eff</i>), emission cross-section (<i>σ_e</i>), gain bandwidth, and lifetime, are predicted with an error of less than 10%, with some properties such as <i>β</i>, Δλ_eff, and <i>σ_e</i> showing an error of less than 5% in specific systems. Four C–S–P databases have also been constructed, containing detailed physical and spectroscopic properties of over 1200 compositions, facilitating the optimization of glass composition. These findings highlight the significance of nearest-neighboring CMCs in understanding and developing high-performance laser glasses.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 4","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115479","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":"3D-printed porous mullite lattice structures by hybrid direct ink writing of silicone suspension-emulsions","authors":"Valeria Diamanti,&nbsp;Hamada Elsayed,&nbsp;Enrico Bernardo","doi":"10.1111/jace.20290","DOIUrl":"https://doi.org/10.1111/jace.20290","url":null,"abstract":"<p>Silicones added with nano-sized alumina particles are already known as starting materials for phase pure mullite ceramics, synthesized at quite low temperatures. The present paper deals with a fundamental upgrade, based on a novel suspension-emulsion concept, for the easy fabrication of highly porous lattice structures. An aqueous suspension of γ-Al₂O₃ nanoparticles in water was first distributed as emulsion within an “oily phase,” consisting of a silicone/acrylates blend, with the help of a surfactant. The mixture was later employed to fabricate highly porous structures (∼80% open porosity), by direct ink writing, that is, an extrusion-based 3D printing technology requiring specific rheological behavior of the feedstock ink. Finally, the structures were rapidly stabilized through a photo-polymerization step (configuring a form of “hybrid” direct ink writing). The presence of water also allowed the application of a freeze-curing procedure, for a second series of samples. The abundant water vapor release from the starting mixtures, upon firing (up to 1300°C), led to structures with enhanced pore interconnectivity. The freeze-curing protocol proved beneficial to the homogeneity of pore distribution and to the achievement of high strength-to-density ratios.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 4","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20290","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115480","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":"Influence of electron irradiation on self-healing and thermal oxidation of SiC dispersed yttrium silicate composites","authors":"Huong Thi Nguyen,&nbsp;Yen-Ling Kuo,&nbsp;Makoto Nanko,&nbsp;Gordon James Thorogood,&nbsp;Alan Xu,&nbsp;Thi Mai Dung Do,&nbsp;Hisayuki Suematsu","doi":"10.1111/jace.20292","DOIUrl":"https://doi.org/10.1111/jace.20292","url":null,"abstract":"<p>Electron irradiation-induced acceleration of self-healing and high-temperature oxidation has been discovered in SiC/Y₂Si₂O₇–Y₂SiO₅ composites. Bulk samples were produced by pulsed electric current sintering. These samples were exposed to an electron beam from the pulsed intense relativistic electron beam accelerator with a beam energy of 2 MeV at irradiation doses of 10–40 kGy. The self-healing and high-temperature oxidation experiments were carried out at 1100–1300°C for 1–24 h in laboratory air. Electron irradiation significantly improved the self-healing effectiveness. The closure of surface cracks was caused by the volume expansion of SiC via transformation to SiO₂ and the outward diffusion of Y³⁺ ions. Electron irradiation also increased the thickness of the internally oxidized zone, formed by the inward diffusion of O²⁻ ions. Enhanced self-healing and oxidation behavior were associated with defect formation induced by electron beam exposure, which facilitated the diffusion of ions within the crystal lattice.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 4","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115185","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":"Rational optimizations of high K microwave dielectric ceramic Bi2(Li0.5Ta1.5)O7 toward LTCC applications","authors":"Diming Xu,&nbsp;Haowei Zhang,&nbsp;Lixia Pang,&nbsp;Fayaz Hussain,&nbsp;Tao Zhou,&nbsp;Shi-Kuan Sun,&nbsp;Zhijiao Chen,&nbsp;Di Zhou","doi":"10.1111/jace.20316","DOIUrl":"https://doi.org/10.1111/jace.20316","url":null,"abstract":"<p>Microwave dielectric ceramics have drawn intensive interests in recent years due to the advanced development in communication area. High-permittivity dielectric ceramics have thus become the highlight owing to dielectric ceramics with high permittivity could meet the demand of electronic components in both stabilization and miniaturization features. Bi₂(Li_0.5Ta_1.5)O₇ shows its great potential among various high-permittivity dielectric ceramics with a suitable permittivity and a considerable quality factor. Based on previous studies, a series of rational optimizations were conducted on Bi₂(Li_0.5Ta_1.5)O₇ to manipulate the temperature coefficient of resonant frequency (TCF) and the sintering temperature for potential Low Temperature Co-fired Ceramic (LTCC) applications. Two distinguished ceramics were obtained, Bi₂(Li_0.5Ta_1.5)O₇–0.03Bi₂O₃ (sintering temperature of 850°C, <i>ε</i>_r ∼ 64.1, <i>Qf</i> ∼ 8510 GHz, TCF—25.3 ppm/°C) and Bi₂[(Li_0.5Ta_1.5)_0.975Ti_0.05]O₇–0.015Bi₂O₃ (sintering temperature of 980°C, <i>ε</i>_r ∼ 66.2, <i>Qf</i> ∼ 10 950 GHz, TCF—8.5 ppm/°C). Dielectric resonator antenna (DRA) simulation was subsequently conducted and proved the ceramics holding excellent potential for microwave applications.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 4","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115285","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":"Pyrolysis synthesis and microstructure of yttrium modified hafnium carbide from polymer precursor","authors":"Huifeng Zhang,&nbsp;Xiaoming Sun,&nbsp;Hao Lan,&nbsp;Min Ge,&nbsp;Shouquan Yu,&nbsp;Qian Sun,&nbsp;Hao Zhang,&nbsp;Weigang Zhang","doi":"10.1111/jace.20300","DOIUrl":"https://doi.org/10.1111/jace.20300","url":null,"abstract":"<p>In this work, a novel polymer precursor for yttrium modified hafnium carbide (HfC) was prepared by blending polyhafnium carboxane, yttrium acetylacetonate with xylene. The pyrolysis behavior and structural evolution of the precursor were comprehensively investigated, along with a thorough examination of the microstructure and composition of the synthesized HfC particles. The results showed that Y element was introduced into the ceramics to form c-HfO₂, with Hf, Y, C and O elements well distributed. The pyrolysis of the polymer precursor at 1600°C produced HfC nanocrystallites with an average grain size of 43 nm, encapsulated by an amorphous carbon shell. The synthesized HfC ceramics exhibited distinct nanostructures that varied from amorphous structure to almost spherical morphology under different pyrolysis temperatures. The underlying formation mechanisms were also discussed.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 4","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115287","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":"La2O3-modified C/C-ZrC composites with long-term cyclic ablation resistance","authors":"Yi Zhang,&nbsp;Dou Hu,&nbsp;Lingxiang Guo,&nbsp;Bing Liu,&nbsp;Xiaoshuang Wang,&nbsp;Qiangang Fu","doi":"10.1111/jace.20302","DOIUrl":"https://doi.org/10.1111/jace.20302","url":null,"abstract":"<p>The compactness of in situ protective film for carbon-based composites during ablation is particularly important for improving their service life. Herein, La₂O₃-modified C/C-ZrC composites were designed by vacuum filtration combined with reactive melt infiltration to construct an in situ dense protective structure. Experimental results show that adding La element could improve the cyclic ablation performance of C/C-ZrC composites significantly. As the La₂O₃ addition amount is 5.6 wt.%, the linear ablation rate of La₂O₃-modified C/C-ZrC composites is –2.62 µm/s and 0.18 µm/s after exposure to an oxyacetylene flame (4.2 MW/m²) for 40 s and 240 s, far superior to that of C/C-ZrC composites (40 s, –6.2 µm/s). The excellent ablation resistance was attributed to the introduction of La element partially weakened Zr-O bonds to induce more oxygen vacancies, which facilitated the sintering of ZrO₂ and eventually promoted the compactness and tetragonal phase stability of the Zr-La-O layer.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 4","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114737","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 temperature selective growth of VO2 polymorphs by one-step hydrothermal method","authors":"Sooraj Kumar,&nbsp;Partha Mishra,&nbsp;Sonika Singh,&nbsp;Ujjwal Chitnis,&nbsp;Bhavesh Thakur,&nbsp;Soupitak Pal,&nbsp;Sumit Sinha-Ray,&nbsp;Ankur Goswami","doi":"10.1111/jace.20293","DOIUrl":"https://doi.org/10.1111/jace.20293","url":null,"abstract":"<p>Phase pure vanadium dioxide (VO₂) polymorphs, namely, VO₂(A), VO₂(M1), and VO₂(B), were successfully prepared via low temperature (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>≤</mo>\u0000 <msup>\u0000 <mn>250</mn>\u0000 <mo>∘</mo>\u0000 </msup>\u0000 <mrow>\u0000 <mi>C</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation>$ le 250^circ {mathrm{C}})$</annotation>\u0000 </semantics></math> hydrothermal technique that is often a challenge. Using Taguchi method of design of experiment (DOE) processing conditions for direct synthesis of said polymorphs based on growth temperature, filling ratio, and molar ratio of reactant were established. Qualitative and quantitative analyses were performed using x-ray diffraction, differential scanning calorimetry, RAMAN, X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and transmission electron microscope. Further, it has been always difficult to coat vanadium oxide nanoparticle on an amorphous substrate. However, by adopting supersonic cold spray technique using de Laval nozzle, obtained nanoparticles were coated on soda lime silica glass substrate as thin film, and subsequent temperature dependent electrical characterizations were carried out. Finally, feasibility of formation of various polymorphs was investigated by calculating Gibbs free energy for each reaction. The obtained ∆<i>G</i>⁰ was (−521 kJ/mol) for VO₂(A), (−694 kJ/mol) for VO₂(B), and (−750 kJ/mol) for VO₂(M1) and was further related to the order of formation of phases. Additionally, an estimation was made on the significance and percentage contribution of each growth parameter, that is, growth temperature, filling ratio, and molar ratio using the algorithm of DOE.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 4","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114738","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":"Design and preparation of chalcogenide glass doublet lenses for infrared optical system","authors":"Gangjie Zhou,&nbsp;Jinjin Chen,&nbsp;Peikuan Fan,&nbsp;Linling Tan,&nbsp;Chengwei Gao,&nbsp;Shiliang Kang,&nbsp;Shixun Dai,&nbsp;Changgui Lin","doi":"10.1111/jace.20311","DOIUrl":"https://doi.org/10.1111/jace.20311","url":null,"abstract":"<p>In the realm of infrared (IR) optics, IR doublet lenses have garnered a lot of attention due to their ability to correct for aberrations. A new series of Ge₁₅Se_85‒<i>_x</i>Te<i>_x</i> (5 ≤ <i>x</i> ≤ 30) chalcogenide glass was developed to possess similar glass transition temperature, excellent thermal stability, and large refractive index variation, which enable them to be a good glass material catalog for IR doublet lenses. First, six glasses were successfully molded into one using thermal bonding, and its refractive index distribution was investigated. To lower the dispersion of IR doublet lenses, the two most suited materials were chosen from the above material library on the basis of their Abbe number (<i>ν</i>) and dispersion (<i>p</i>) value. With the created doublet lenses, an IR optical system with a wavelength of 3‒12 µm was designed. The system's modulation transfer function curve demonstrated its good imaging performance (&gt;0.3 @ 24 cycles/mm). Through additional optical design, we discovered that modifying the curvature of the internal interface of the IR doublet lens could reduce the length of the optical system by 17% while maintaining its performance.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 4","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114691","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":"Synthesis and negative thermal expansion performance of (NaMg)3+ codoped Sc2W3O12 ceramics","authors":"Xiaoxue Fan,&nbsp;Zhiping Zhang,&nbsp;Hongfei Liu","doi":"10.1111/jace.20315","DOIUrl":"https://doi.org/10.1111/jace.20315","url":null,"abstract":"<p>A series of Na<i>_x</i>Mg<i>_x</i>Sc_2 −<i>_x</i>W₃O₁₂ (0 ≤ <i>x</i> ≤ 0.75) ceramics has been prepared by the coprecipitation process. The phase composition, crystal structure, morphology, and thermal expansion behavior of Na<i>_x</i>Mg<i>_x</i>Sc_2 −<i>_x</i>W₃O₁₂ samples were investigated. The results show that (NaMg)³⁺ substitution causes a phase transition in Na<i>_x</i>Mg<i>_x</i>Sc_2 −<i>_x</i>W₃O₁₂. For 0 &lt; <i>x</i> ≤ 0.25, both orthorhombic Sc₂W₃O₁₂ and hexagonal Na<i>_x</i>Mg<i>_x</i>Sc_2 −<i>_x</i>W₃O₁₂ coexist in the sample. For 0.25 &lt; <i>x</i> ≤ 0.75, (NaMg)³⁺ double cations successfully replace Sc³⁺, and single-phase hexagonal Na<i>_x</i>Mg<i>_x</i>Sc_2 −<i>_x</i>W₃O₁₂ ceramics were prepared. For <i>x </i>= 1, the impurity MgWO₄ was detected. As the (NaMg)³⁺ codoping amount increases, the grain size grew up and the density of the Na<i>_x</i>Mg<i>_x</i>Sc_2 −<i>_x</i>W₃O₁₂ ceramics increased. The coefficients of thermal expansion (CTE) of negative thermal expansion (NTE) Na<i>_x</i>Mg<i>_x</i>Sc_2 −<i>_x</i>W₃O₁₂ (0 ≤ <i>x</i> ≤ 0.75) ceramics were improved from −6.02 × 10⁻⁶°C⁻¹ to −15.19 × 10⁻⁶°C⁻¹ in 30–700°C. Moreover, as the sintering temperature increased, the CTEs of Na_0.75Mg_0.75Sc_1.25W₃O₁₂ ceramics were improved from −10.36 × 10⁻⁶°C⁻¹ to −13.64 × 10⁻⁶°C⁻¹.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 4","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114736","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}