Journal of the American Ceramic Society最新文献

Low-temperature bubble formation in silica glass

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-10-28 DOI: 10.1111/jace.20130

E. M. Aaldenberg, K. T. Hufziger, M. Tomozawa

{"title":"Low-temperature bubble formation in silica glass","authors":"E. M. Aaldenberg, K. T. Hufziger, M. Tomozawa","doi":"10.1111/jace.20130","DOIUrl":"https://doi.org/10.1111/jace.20130","url":null,"abstract":"Phase separation was observed in silica glass following low-temperature heat treatment in high water vapor pressure through the formation of bubbles. Although the 6 day diffusion treatment in saturated water vapor pressure at 250°C does not normally cause phase separation, the reactive fracture surface and subsurface damage caused by polishing with cerium oxide (CeO2) allowed for an increase in water absorption during treatment and heterogeneous nucleation of the bubbles at damaged sites. The sub-surface damage, characteristic of blunt contact damage, was only revealed when the polished sample was etched. The formation of bubbles and polishing damage were observed in two silica glasses—one containing chlorine impurities and the other containing OH impurities. Raman spectra collected after fracture or polishing and water diffusion treatment demonstrated an increase in the abundance of –OH species including silanol (SiOH) groups and an evolution in the glass structure in the bubble regions compared with the bubble-free regions. These results indicate an increase in the reactivity between water and glass fracture surfaces relative to the bulk.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762851","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}

引用次数: 0

Order evolution from a high-entropy matrix: Understanding and predicting paths to low-temperature equilibrium

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-10-28 DOI: 10.1111/jace.20223

Saeed S. I. Almishal, Leixin Miao, Yueze Tan, George N. Kotsonis, Jacob T. Sivak, Nasim Alem, Long-Qing Chen, Vincent H. Crespi, Ismaila Dabo, Christina M. Rost, Susan B. Sinnott, Jon-Paul Maria

{"title":"Order evolution from a high-entropy matrix: Understanding and predicting paths to low-temperature equilibrium","authors":"Saeed S. I. Almishal, Leixin Miao, Yueze Tan, George N. Kotsonis, Jacob T. Sivak, Nasim Alem, Long-Qing Chen, Vincent H. Crespi, Ismaila Dabo, Christina M. Rost, Susan B. Sinnott, Jon-Paul Maria","doi":"10.1111/jace.20223","DOIUrl":"https://doi.org/10.1111/jace.20223","url":null,"abstract":"Interest in high-entropy inorganic compounds originates from their ability to stabilize cations and anions in local environments that rarely occur at standard temperature and pressure. This leads to new crystalline phases in many-cation formulations with structures and properties that depart from conventional trends. The highest-entropy homogeneous and random solid solution is a parent structure from which a continuum of lower-entropy offspring can originate by adopting chemical and/or structural order. This report demonstrates how synthesis conditions, thermal history, and elastic and chemical boundary conditions conspire to regulate this process in Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O, during which coherent CuO nanotweeds and spinel nanocuboids evolve. We do so by combining structured synthesis routes, atomic-resolution microscopy and spectroscopy, density functional theory, and a phase field modeling framework that accurately predicts the emergent structure and local chemistry. This establishes a framework to appreciate, understand, and predict the macrostate spectrum available to a high-entropy system that is critical to rationalizing property engineering opportunities.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20223","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762872","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}

引用次数: 0

Boron nitride: Novel ceramic reductant for low-activity waste vitrification

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-10-28 DOI: 10.1111/jace.20192

Jessica C. Rigby, José Marcial, Richard Pokorny, Jaroslav Kloužek, Kee Sung Han, Nancy Washton, Pavel Ferkl, Pavel Hrma, Alex Scrimshire, Paul A. Bingham, Mark Hall, Will Eaton, Albert A. Kruger

{"title":"Boron nitride: Novel ceramic reductant for low-activity waste vitrification","authors":"Jessica C. Rigby, José Marcial, Richard Pokorny, Jaroslav Kloužek, Kee Sung Han, Nancy Washton, Pavel Ferkl, Pavel Hrma, Alex Scrimshire, Paul A. Bingham, Mark Hall, Will Eaton, Albert A. Kruger","doi":"10.1111/jace.20192","DOIUrl":"https://doi.org/10.1111/jace.20192","url":null,"abstract":"During vitrification of radioactive wastes, excessive foaming reduces processing rates within melters by hindering heat transfer from the molten glass pool to the reacting melter feed. Formulations of low-activity waste (LAW) melter feeds, for vitrification at the Waste Treatment and Immobilization Plant at the Hanford Site, conventionally include the addition of sucrose to mitigate excessive foaming by hastening the denitration process. However, incomplete combustion of sucrose produces organics such as acetonitrile (C2H3N) that may exceed bounding limits of downstream effluent treatment facilities. Using boron nitride (BN) as an alternate reductant to sucrose, in a representative LAW melter feed reduced C2H3N production by 90% by preventing the low-temperature sucrose–nitrate reactions. Furthermore, foaming was suppressed due to the higher decomposition temperature of BN than H3BO3 meaning a delayed reaction of a large fraction of boron with the transient glass-forming melt until above the foam onset temperature, thus reducing the quantity and viscosity of the connected melt and trapping less gas in the foam layer.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20192","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762850","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}

引用次数: 0

Interlaboratory study of flexural strength in additively manufactured alumina

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-10-28 DOI: 10.1111/jace.20133

Russell Allan Maier, Andrew J. Allen, Brandon Cox, Igor Levin

{"title":"Interlaboratory study of flexural strength in additively manufactured alumina","authors":"Russell Allan Maier, Andrew J. Allen, Brandon Cox, Igor Levin","doi":"10.1111/jace.20133","DOIUrl":"https://doi.org/10.1111/jace.20133","url":null,"abstract":"We report the results of an international interlaboratory study of the flexural strength of alumina fabricated across six laboratories using the vat photopolymerization ceramic additive manufacturing (AM) technology. The mechanical testing of all the specimens, 142 in total, was performed at the National Institute of Standards and Technology (NIST) according to the well-established four-point bending method standardized for traditional ceramics. Overall, the existing ASTM standard for the four-point bend testing proved adequate for AM ceramics, with several modifications to the specimen requirements to account for the specifics of AM processes. Critical flaws that caused failure were identified in all but two cases using optical fractography augmented with the imaging of fracture surfaces in a scanning electron microscope. The flexural strength data, analyzed following the Weibull statistics, exhibited considerable variation among the specimen sets manufactured by different laboratories. This variability correlated with the presence of many distinct critical flaws. We identified seven types of flaws that accounted for the failure of 94% of specimens. The prevalent flaws depend on the printing direction relative to the specimen's geometry. We discuss the nature of these flaws and their relation to the printing and post-processing conditions. Removal of several types of critical flaws will significantly improve mechanical properties of ceramic parts built using vat-photopolymerization AM.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762849","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}

引用次数: 0

Microstructure and ablation behavior of C/C–HfC–SiC composites fabricated by reactive melt infiltration with Hf–Si alloy

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-10-25 DOI: 10.1111/jace.20215

Chongqing Xu, Chenglan Jia, Qian Liu, Zheng Peng, Sian Chen

引用次数: 0

Effect of binary ion substitution on the crystal structure and microwave dielectric properties of MgTa2O6 ceramics

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-10-25 DOI: 10.1111/jace.20232

Yang Gao, Junjie Chen, Weishuang Fang, Haiyi Peng, Tianyi Xie, Haishen Ren, Xiaogang Yao, Huixing Lin

{"title":"Effect of binary ion substitution on the crystal structure and microwave dielectric properties of MgTa2O6 ceramics","authors":"Yang Gao, Junjie Chen, Weishuang Fang, Haiyi Peng, Tianyi Xie, Haishen Ren, Xiaogang Yao, Huixing Lin","doi":"10.1111/jace.20232","DOIUrl":"https://doi.org/10.1111/jace.20232","url":null,"abstract":"Mg1/3A11/3A21/3Ta2O6 ceramics (where A1 and A2 represent Co, Ni, or Zn) were prepared using the solid-phase reaction route. The results of X-ray diffraction and Raman tests showed that (Co1/2Ni1/2)2+, (Co1/ 2Zn1/2)2+, and (Ni1/2Zn1/2)2+ ions replaced Mg2+ ions in the lattice of MgTa2O6, resulting in the formation of a pure tri-rutile structure. All three complex ions could significantly reduce the sintering temperature of the ceramics (by 150°C–200°C) and could broaden the sintering window. The large deviation (48.8%–69.2%) between the porosity corrected relative permittivity εr-corr. and the theoretical relative permittivity εr-theo. might be due to the overestimation of the ionic polarizability of Ta5+ by Shannon. (Co1/2Ni1/2)2+ has the most significant effect of increasing the bond energy of ceramic A–O bonds, reducing the τf value from 51 to 36 ppm/°C. In addition, the mechanisms affecting their dielectric properties are discussed based on bond ionicity (fi), full width at half maximum (FWHM) of Raman peak, and bond energy (E). Mg1/3Co1/3Ni1/3Ta2O6 ceramic sintered at 1350°C have the most excellent microwave dielectric properties: εr = 26.8, Q × f = 86,000 GHz, and τf = 36 ppm/°C.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762582","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}

引用次数: 0

The structural, magnetic, and optical properties of flame spray pyrolysis-derived spinel NiFe2O4 nanoparticles

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-10-23 DOI: 10.1111/jace.20220

Serdar Yildirim, Berk Ozler, Erdem Tevfik Ozdemir, Mustafa Erol, Tuncay Dikici, Sibel Oguzlar

{"title":"The structural, magnetic, and optical properties of flame spray pyrolysis-derived spinel NiFe2O4 nanoparticles","authors":"Serdar Yildirim, Berk Ozler, Erdem Tevfik Ozdemir, Mustafa Erol, Tuncay Dikici, Sibel Oguzlar","doi":"10.1111/jace.20220","DOIUrl":"https://doi.org/10.1111/jace.20220","url":null,"abstract":"In this study, spinel NiFe2O4 nanoparticles were synthesized employing a one-step flame spray pyrolysis technique and subjected to annealing at 500°C for 4 h. Thermal, structural, elemental, morphological, magnetic, and photoluminescence properties of the nanoparticles before and after annealing were evaluated using thermogravimetry–differential thermal analyzer, X-ray diffraction (XRD), X-ray photoelectron spectroscopy, scanning electron microscopy, dynamic light scattering, vibrating sample magnetometry, and fluorescence spectrometer, respectively. Results revealed a pronounced increase in particle size from an average of 80 nm to approximately 140 nm postannealing. XRD verified the retention of the cubic spinel structure with enhanced crystallinity and grain enlargement post-thermal treatment, without the emergence of additional phases. The photoluminescence analysis showed distinct blue and green emission bands, with excitation at about 364 nm leading to blue emission at 500 nm and green emission at 550 nm both as-prepared and postannealing. Additionally, magnetic characterization revealed an improvement in saturation magnetization from 16.31 emu/g for the as-prepared samples to 29.68 emu/g postannealing, underscoring the annealing process's positive impact on magnetic properties. These findings emphasize the potential of tailored NiFe2O4 nanoparticles for applications in magnetic data storage, targeted drug delivery, and bioimaging, driven by modifications in their magnetic and photoluminescence characteristics through thermal treatment.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20220","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762809","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}

引用次数: 0

High-performance thermoelectric calcium cobaltite nanoribbon ceramic via electrospinning and dual spark plasma texturing

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-10-23 DOI: 10.1111/jace.20198

Katharina Kruppa, Itzhak I. Maor, Anat Karlin, Frank Steinbach, Gennady E. Shter, Dorothea Stobitzer, Hilke Petersen, Bernd Breidenstein, Meirav Mann-Lahav, Gideon S. Grader, Armin Feldhoff

{"title":"High-performance thermoelectric calcium cobaltite nanoribbon ceramic via electrospinning and dual spark plasma texturing","authors":"Katharina Kruppa, Itzhak I. Maor, Anat Karlin, Frank Steinbach, Gennady E. Shter, Dorothea Stobitzer, Hilke Petersen, Bernd Breidenstein, Meirav Mann-Lahav, Gideon S. Grader, Armin Feldhoff","doi":"10.1111/jace.20198","DOIUrl":"https://doi.org/10.1111/jace.20198","url":null,"abstract":"High-performance polycrystalline calcium cobaltite ceramic was synthesized via electrospinning of nanoribbons, followed by dual-process compaction using spark plasma sintering and edge-free spark plasma texturing. The combination of nanoribbon electrospinning and this multistage sintering technique was employed for the first time and resulted in exceptionally well-textured thermoelectric ceramics. The textured ceramic had excellent thermoelectric properties. At 1073 K, the ceramic exhibited an electrical conductivity of 268 S cm−1, a Seebeck coefficient of 247 µV K−1 and a heat conductivity of 3.3 W m−1 K−1. In addition, the power factor and figure-of-merit reached enormously high values of 16.3 µW cm−1 K−2 and 0.53, respectively. This represents the highest thermoelectric performance reported to date not only for electrospun, polycrystalline calcium cobaltite fiber ceramics, but also for undoped polycrystalline calcium cobaltite ceramics.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20198","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762762","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}

引用次数: 0

Ta doping effect on microstructure and microwave dielectric properties of CoNb2O6-based ceramics and mechanism study

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-10-23 DOI: 10.1111/jace.20226

Wenxiao Jia, Zipeng Huang, Lingxia Li

{"title":"Ta doping effect on microstructure and microwave dielectric properties of CoNb2O6-based ceramics and mechanism study","authors":"Wenxiao Jia, Zipeng Huang, Lingxia Li","doi":"10.1111/jace.20226","DOIUrl":"https://doi.org/10.1111/jace.20226","url":null,"abstract":"As communication technology continues to evolve, 5G technology is becoming more mature, and 6G technology is steadily advancing. Microwave equipment is moving toward high frequency, miniaturization, low loss and high temperature stability, and microwave dielectric ceramics have been deeply applied in this field. To elevate the Q × f value of CoNb2O6 system, Ta5+ was introduced into CoNb2O6, and CoNb2-xTaxO6 (0.0 ≤ x ≤ 0.8) ceramics were prepared by the traditional solid-phase method. By X-ray diffraction, it was observed that at x = 0.8, in addition to a single niobium ferrite phase, information of tantalate phase also appeared. Raman spectral detection and group theory analysis indicate that Ag(2) and Ag(3) modes are the dominant Raman vibrations at ≈873 cm−1. Furthermore, the polarization rate affects the εr value, and the bond energy of Nb/Ta-O and the recovery force characterized by the average deformation of the [Nb/TaO6] octahedron are the key elements influencing the temperature coefficient of the resonance frequency (τf). The internal strain, ordered induced size, and chemical bonding valence of ionic valence states are the key factors that can increase the Q × f value. Moreover, the introduction of ions with lower electronegativity leads to an enhanced electronic compensation of oxygen vacancies, which also reduces the dielectric loss. This paper enriches the theory related to low dielectric loss and shows that CoNb1.8Ta0.2O6 (εr = 21.4832, Q × f = 100723 GHz, τf = -61.38 ppm/°C) ceramics with superior microwave dielectric properties are expected to be used in wireless communication devices.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762807","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}

引用次数: 0

Boron nitride nanosheets composite SiC fibers with enhanced mechanical properties and high-temperature resistance

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-10-23 DOI: 10.1111/jace.20193

Quzhi Song, Xin Long, Bing Wang, Qianlong Wang, Wenjun Liu, Nana Xu, Shuang Wu, Yiang Du, Yucheng Ou, Tao Liu, Fuwen Wang, Yingde Wang

{"title":"Boron nitride nanosheets composite SiC fibers with enhanced mechanical properties and high-temperature resistance","authors":"Quzhi Song, Xin Long, Bing Wang, Qianlong Wang, Wenjun Liu, Nana Xu, Shuang Wu, Yiang Du, Yucheng Ou, Tao Liu, Fuwen Wang, Yingde Wang","doi":"10.1111/jace.20193","DOIUrl":"https://doi.org/10.1111/jace.20193","url":null,"abstract":"Continuous SiC fibers with excellent mechanical properties and high-temperature resistance possess immense potential as reinforcements for aeroengines. In this work, we prepared functionalized boron nitride nanosheet (F-BNNS) composite SiC (F-BNNS/SiC) fibers by polymer-derived method. Due to the existence of F-BNNS, the F-BNNS/SiC fibers demonstrate an improved tensile strength up to 2300 MPa, representing a 25% increase compared to the original SiC fibers. Furthermore, owing to the chemical bonds established between the F-BNNS and the SiCxOy network, the decomposition of the SiCxOy amorphous phase and the crystallization of SiC at high temperatures is effectively suppressed. The F-BNNS/SiC fibers exhibit improved high-temperature resistance, maintaining a tensile strength of 720 MPa up to 1500°C, while the SiC fibers completely degraded under the same conditions. The successful preparation of BNNS/SiC fibers may offer new insights into the performance enhancement of advanced ceramic fibers.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762808","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}

引用次数: 0