Journal of the American Ceramic Society最新文献_第9页

Yb3+ Sensitized Er3+ Upconversion Phosphors for Noninvasive Luminescence-Based Optical Thermometry 用于无创发光光学测温的Yb3+敏化Er3+上转换荧光粉

IF 3.8 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-04-29 DOI: 10.1111/jace.70774

Rupesh A. Talewar, Marcus Williams, Kevin Bennett, B. Rami Reddy

{"title":"Yb3+ Sensitized Er3+ Upconversion Phosphors for Noninvasive Luminescence-Based Optical Thermometry","authors":"Rupesh A. Talewar, Marcus Williams, Kevin Bennett, B. Rami Reddy","doi":"10.1111/jace.70774","DOIUrl":"https://doi.org/10.1111/jace.70774","url":null,"abstract":"<div>\u0000 \u0000 Rare earth ion doped Zn2P2O7 phosphor was synthesized via a solid‑state reaction route. XRD measurements confirmed the formation of a single‑phase Zn2P2O7 lattice. Sensitization of Er3+ (4I13/2→4I15/2) near‑infrared emission by Yb3+ ions via an energy transfer process under 980 nm excitation is discussed. Energy transfer upconversion (ETU) was also investigated in Er3+ and Er3+/Yb3+ co‑doped Zn2P2O7 phosphors. Intense upconversion (UC) emissions were observed from Er3+ in the green (520–570 nm) and red (640–680 nm) regions under 980 nm diode laser excitation. Fluorescence intensity ratio (FIR)-based thermometry was explored using both thermally coupled levels (TCL) and non‑thermally coupled levels (NTCL). The material exhibits a consistent temperature‑dependent luminescence response with high relative sensitivity (SR) over the investigated temperature range. The experimentally determined temperature resolution reaches 1 K at room temperature and 2.1 K at 390 K under practical measurement conditions, demonstrating reliable thermometric performance over a wide temperature range. These results provide critical insights into temperature-dependent luminescence characteristics and establish Zn2P2O7:Er3+,Yb3+ as a promising candidate for the next-generation photonic and sensors applications.\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148050482","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

Progress in Characterizing Curing and Debinding of Ceramic Inks for Stereolithography 立体光刻用陶瓷油墨固化与脱胶特性研究进展

IF 3.8 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-04-29 DOI: 10.1111/jace.70747

Sylvain Fournier, Jérôme Chevalier, Guilhem P. Baeza, Helen Reveron

{"title":"Progress in Characterizing Curing and Debinding of Ceramic Inks for Stereolithography","authors":"Sylvain Fournier, Jérôme Chevalier, Guilhem P. Baeza, Helen Reveron","doi":"10.1111/jace.70747","DOIUrl":"https://doi.org/10.1111/jace.70747","url":null,"abstract":"During ceramic stereolithography, laser photopolymerization must achieve high and uniform curing of monomers to ensure a crack-free debinding step. In this study, we present a spatially resolved quantification of curing rate using Fourier transform infrared (FTIR) spectroscopy, relying on advanced deconvolution methods. Beyond the usual characterization performed on single-layer samples, we quantify the curing rate on multilayer samples that are representative of real printed parts. Of particular interest is the pairing of FTIR spectroscopy with a numerical model calculating energy exposure from lasing parameters, enabling to confirm the presence of curing heterogeneities. For the first time in ceramic printing inks, we use low-field nuclear magnetic resonance (LF-NMR) relaxometry in addition to more usual chemical probes to assess curing rate based on the mobility of ink's organic species. The combination of dynamic mechanical analysis, also novel for this field, and differential scanning calorimetry, further reveals polymer network relaxation slightly below organic debinding temperature, which highlights the importance of a well-controlled curing process. Finally, thermogravimetric analysis emphasizes favorable interactions between acrylate-end groups and plasticizers, facilitating crack-free gradual debinding at elevated temperature. These findings collectively provide valuable insights for optimizing ceramic stereolithography processes and improving part reliability.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.70747","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148050484","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

Low-Temperature Densification of Si3N4 Ceramics With MnO as a Sintering Additive MnO作为烧结添加剂的Si3N4陶瓷的低温致密化

IF 3.8 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-04-29 DOI: 10.1111/jace.70782

Zhiheng Ma, Shuo Zhao, Dengke Zhao, Yiyao Ge, Jie Zhang, Kexin Chen, Guanghua Liu

{"title":"Low-Temperature Densification of Si3N4 Ceramics With MnO as a Sintering Additive","authors":"Zhiheng Ma, Shuo Zhao, Dengke Zhao, Yiyao Ge, Jie Zhang, Kexin Chen, Guanghua Liu","doi":"10.1111/jace.70782","DOIUrl":"https://doi.org/10.1111/jace.70782","url":null,"abstract":"<div>\u0000 \u0000 Dense Si3N4 ceramics were fabricated by spark plasma sintering (SPS) using a MnO–Al2O3 additive system, and the effects of sintering temperature, pressure and holding time on densification behavior, phase transformation, microstructure development and mechanical properties were systematically investigated. Near-theoretical densification was achieved at a relatively low temperature of 1450°C, demonstrating the strong fluxing effect of MnO in promoting liquid-phase-assisted sintering. The α–β phase transformation was found to be highly sensitive to the sintering conditions, enabling continuous tuning of the α/β phase ratio over a wide range. This controlled phase transformation resulted in pronounced microstructural changes, from fine equiaxed α-Si3N4 grains to elongated columnar β-Si3N4 grains, leading to a broad and tunable hardness-fracture toughness range. The highest hardness of 23.6 ± 0.4 GPa was obtained in the 1550-100-5 sample, while the highest fracture toughness of 8.4 ± 0.4 MPa·m1/2 was achieved in the 1700-100-20 sample. These results demonstrate that MnO is an effective non-rare-earth sintering additive for low-temperature densification and microstructure design of Si3N4 ceramics, providing an alternative strategy to regulate phase composition and mechanical properties using transition metal oxides.\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148050493","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

Stepwise Oxidation Mechanisms of h-BN: Effect of Zigzag Edge and Armchair Edge h-BN的逐步氧化机理：锯齿边和扶手边的影响

IF 3.8 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-04-29 DOI: 10.1111/jace.70764

Yanqiu Hu, Xingli Liu, Jiagang Chen, Liang Huang, Haijun Zhang, Shaowei Zhang, Zhijun Dong

{"title":"Stepwise Oxidation Mechanisms of h-BN: Effect of Zigzag Edge and Armchair Edge","authors":"Yanqiu Hu, Xingli Liu, Jiagang Chen, Liang Huang, Haijun Zhang, Shaowei Zhang, Zhijun Dong","doi":"10.1111/jace.70764","DOIUrl":"https://doi.org/10.1111/jace.70764","url":null,"abstract":"<div>\u0000 \u0000 Hexagonal boron nitride (h-BN) exhibits exceptional thermal stability and chemical inertness, enabling versatile applications in harsh environments. However, under high-temperature conditions, h-BN undergoes oxidation, leading to material degradation and limiting its practical utility. This study investigates the oxidation mechanisms of h-BN using density functional theory (DFT) calculations at the generalized gradient approximation (GGA) level with the Perdew–Burke–Ernzerhof (PBE) functional. The results reveal that O2 molecules dissociate more readily at Zigzag edges of h-BN with a low activation energy of 0.04 eV, while at the Armchair edges, this dissociation requires a higher activation energy of 0.60 eV. The stepwise oxidation of Zigzag-BN and Armchair-BN reveals that the oxidation primarily proceeds through continuous oxidation in Zigzag-BN that disrupts planar structure and breaks the six-membered BN rings, whereas the continuous oxidation mainly targets the six-membered BN rings in Armchair-BN. Once oxygen adsorbs and weakens the B─N bonds, N atoms removal becomes energetically more favorable. The oxidation products exhibit distinct structural features: Zigzag edges generate ring-island B2O3, whereas Armchair edges produce chain-like B2O3. These findings provide fundamental atomic-level insights into the intrinsic oxidation and edge-specific reactivity of h-BN, establishing a theoretical foundation for future defect control and selective passivation strategies against high-temperature oxidation.\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148050495","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}

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A Comprehensive Research on Thermal Expansion and Critical Magnetic Behavior in HoFe12−xNbx Compounds HoFe12−xNbx化合物的热膨胀和临界磁性综合研究

IF 3.8 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-04-29 DOI: 10.1111/jace.70766

Qiao Zhou, Jie Pu, Zhenxiang Cheng, Zhimin Wu, Xuewei Lv, Xin Jin, Peng Yu, Jian Li Wang

{"title":"A Comprehensive Research on Thermal Expansion and Critical Magnetic Behavior in HoFe12−xNbx Compounds","authors":"Qiao Zhou, Jie Pu, Zhenxiang Cheng, Zhimin Wu, Xuewei Lv, Xin Jin, Peng Yu, Jian Li Wang","doi":"10.1111/jace.70766","DOIUrl":"https://doi.org/10.1111/jace.70766","url":null,"abstract":"<div>\u0000 \u0000 Thermal and magnetic properties of HoFe12−xNbx series of compounds were systematically investigated using variable-temperature high-resolution synchrotron x-ray diffraction, neutron powder diffraction, and magnetic measurements. Rietveld refinement of temperature-dependent x-ray diffraction data reveals a pronounced thermal expansion anomaly near the Curie temperature (Tc), indicative of strong magnetoelastic coupling effect. Neutron diffraction study on HoFe11.3Nb0.7 confirms that the Ho and Fe magnetic moments exhibit antiparallel coupling, forming a ferrimagnet, and below Tc, its easy-magnetization direction is parallel to the crystallographic c-axis. The critical magnetic behavior near Tc was analyzed by the Kouvel–Fisher method and modified Arrott plots, confirming a second-order magnetic phase transition with the extracted critical exponents being consistent with mean-field theory. Moreover, scaling analysis shows that field-dependent magnetization data near Tc collapse into two universal curves, confirming the reliability of the derived critical exponents. The analysis of magnetic data reveals that the HoFe11.35Nb0.65 compound exhibits maximum magnetic entropy changes of -ΔSmax = 2.03 and 3.81 J·kg−1K−1 near Tc under magnetic field changes of 2 and 5 T, respectively. The relative cooling power (RCP) values reach 76.8 and 191.6 J·kg−1. These results demonstrate that HoFe11.35Nb0.65 is a promising candidate for high-temperature magnetic refrigeration materials.\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148050736","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}

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Correction to “[Carborane-Terminated Silicon Arylacetylene Precursor: High Ceramic Yield and Superior Oxidation Resistance]” 更正“[端碳硼烷硅芳基乙炔前驱体：高陶瓷产率和优异的抗氧化性]”

IF 3.8 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-04-29 DOI: 10.1111/jace.70787

引用次数: 0

Rhenium Volatilization From Molten Glass: Relationship Between Volatilization and Melt Viscosity 熔融玻璃中铼的挥发：挥发与熔体粘度的关系

IF 3.8 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-04-29 DOI: 10.1111/jace.70750

Chenchen Niu, Michael I. Ojovan, Kai Xu

{"title":"Rhenium Volatilization From Molten Glass: Relationship Between Volatilization and Melt Viscosity","authors":"Chenchen Niu, Michael I. Ojovan, Kai Xu","doi":"10.1111/jace.70750","DOIUrl":"https://doi.org/10.1111/jace.70750","url":null,"abstract":"<div>\u0000 \u0000 Rhenium (Re) is a nonradioactive surrogate for technetium-99 (Tc-99), which is a highly volatile nuclide at elevated temperatures and poses critical challenges for nuclear waste vitrification. Consequently, understanding Re volatilization behavior is crucial for improving vitrification efficiency. This study investigated Re loss in borosilicate glasses as a function of melt viscosity, which revealed that a reduction in viscosity from ∼15.9 to ∼5.2 Pa·s increased Re volatilization by ∼40% over 8 h at 1200°C. A nonoxidizing volatilization model (NOX model), which integrated Fick's law, reaction kinetics, and partition coefficients, characterized the relationship between reaction and diffusion and accounts for unique localized states of Re in the glass melt to describe this behavior. The NOX model effectively described Re volatilization from molten glass across a wide range of melt viscosity. The coefficient analysis showed that Re volatilization was governed by its diffusion coefficient, which increased from ∼1.5 × 10−8 to ∼1.5 × 10−7 cm2/s as melt viscosity decreased. Moreover, a modified Stokes–Einstein equation employing the effective radius of Re showed that the theoretical radius of Re (∼5.6 × 10−11 m) exceeded its effective radius (∼2.1 × 10−11 m). A ∼60% reduction in the effective radius of Re with lower viscosity confirmed that glass network depolymerization enhanced Re mobility. Concurrently, increased partition coefficients under reduced viscosity further validated the role of shorter diffusion pathways in promoting Re volatilization.\u0000 </div>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"109 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148050496","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}

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IF 3.8 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-04-29

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IF 3.8 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-04-29

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IF 3.8 3区材料科学

Journal of the American Ceramic Society Pub Date : 2026-04-29

引用次数: 0