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4,296 Newest Publications in journal of the american ceramic society

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First‐principles and crystal‐field calculations of the electronic and optical properties of two novel red phosphors Rb2HfF6:Mn4+ and Cs2HfF6:Mn4+

08-Jan-2018 | Dong‐Xu Liu, Chong‐Geng Ma, Pei‐Wen Hu, Zuo Li, Ya Tian, Ping Su, Mikhail G. Brik, Alok M. Srivastava, Setsuhisa Tanabe, Journal of the American Ceramic Society, 2018

Abstract The electronic, structural, and optical properties of 2 red phosphors, Rb2HfF6:Mn4+ and Cs2HfF6:Mn4+, are evaluated using the first‐principles and crystal field theory methods. The calculated trigonal splitting of the Mn4+ orbital triplets perfectly matches the experimental excitation ...

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Formation of structural defects and strain in electrodegraded Fe‐doped SrTiO3 crystals due to oxygen vacancy migration

06-Jan-2018 | David Ascienzo, Onur Kurt, Steve Greenbaum, Thorsten J. M. Bayer, Russell A. Maier, Clive A. Randall, Yuhang Ren, Journal of the American Ceramic Society, 2018

Abstract We report on our investigation of structural defect and strain formation in electrodegraded reduced and oxidized, Fe‐doped SrTiO3 (Fe:STO) single crystals using optical second harmonic generation (SHG) and confocal Raman spectroscopy. SHG and Raman spectra reveal structural and ...

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Inorganic polymers made of fayalite slag: on the microstructure and behavior of Fe

04-Jan-2018 | Silviana Onisei, Alexios P. Douvalis, Annelies Malfliet, Arne Peys, Yiannis Pontikes, Journal of the American Ceramic Society, 2018

Abstract The microstructure of inorganic polymers (IP) formed from fayalite slag was investigated as a function of the composition of different activating solutions. The starting slag was 80 wt% amorphous, and after activation using sodium silicate solutions with varying SiO2/Na2O molar ...

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Amorphization‐induced volume change and residual stresses in boron carbide

02-Jan-2018 | Gregory Parsard, Ghatu Subhash, Phillip Jannotti, Journal of the American Ceramic Society, 2018

Abstract The residual pressure surrounding quasistatic and dynamic Vickers indentations in boron carbide was quantitatively mapped in three dimensions using Raman spectroscopy. These maps were compared against similar maps of amorphization intensity and optical micrographs of deformed regions ...

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Ionic transport in AgI‐HgS‐As2S3 glasses: Critical percolation and modifier‐controlled domains

02-Jan-2018 | Mohammad Kassem, Sohayb Khaoulani, Eugene Bychkov, Journal of the American Ceramic Society, 2018

Abstract Electrical measurements, dc and ac, show that (AgI)x(HgS)0.5‐x/2(As2S3)0.5‐x/2 glasses, 0.0 ≤ x ≤ 0.6, exhibit drastic changes in ionic conductivity σi with silver iodide additions. The ionic transport increases by 13 orders of magnitude with increasing silver content from ~0.002 to ~ ...

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Phase coexistence and large piezoelectricity in BaTiO3‐CaSnO3 lead‐free ceramics

02-Jan-2018 | Yang Yang, Yibei Zhou, Juan Ren, Qiaoji Zheng, Kwok Ho Lam, Dunmin Lin, Journal of the American Ceramic Society, 2018

Abstract Ferroelectric phase coexistence was constructed in (1‐x)BaTiO3–xCaSnO3 lead‐free ceramics, and its relationship with the piezoelectricity of the materials was investigated to ascertain potential factors for strong piezoelectric response. It is found that the addition of CaSnO3 caused ...

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Revisiting the temperature‐dependent dielectric permittivity of Ba(Ti1‐xZrx)O3

29-Dec-2017 | Laijun Liu, Shaokai Ren, Jie Zhang, Biaolin Peng, Liang Fang, Dawei Wang, Journal of the American Ceramic Society, 2017

Abstract It has been a challenge to provide a unified description of the dielectric response versus temperature for ferroelectrics with diffuse phase transition (DPT) and relaxor behaviors, which can be used to fit the dielectric response both below and above the peak temperature (Tm). Most of ...

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Mechanical Activation and Cement Formation of Trimagnesium Phosphate

27-Dec-2017 | Theresa Brückner, Katrin Hurle, Anja Stengele, Jürgen Groll, Uwe Gbureck, Journal of the American Ceramic Society, 2017

Abstract Magnesium phosphate cements have attracted increasing attention for biomedical applications in the past years due to their high mechanical performance and fast in vivo degradation at bony implantation sites. Cements are usually multicomponent mixtures of cement raw powders and setting ...

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Orientation dependent mechanical and thermal properties of plasma sprayed ceramics

23-Dec-2017 | Gregory M. Smith, Michael Resnick, Björn Kjellman, Jan Wigren, Gopal Dwivedi, Sanjay Sampath, Journal of the American Ceramic Society, 2017

Abstract Due to droplet based assembly, microstructure anisotropy is expected in atmospheric plasma sprayed coatings (APS), with lamellar separations and interfaces having critical effects on properties. Quantitative determination of these anisotropic properties is difficult due to geometric ...

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Microwave Assisted Synthesis and Characterization of Single‐Phase Tabular Hexagonal Newberyite, an Important Bioceramic

23-Dec-2017 | Prabaha Sikder, Sarit B. Bhaduri, Journal of the American Ceramic Society, 2017

Abstract Magnesium phosphate compounds such as newberyite (MgHPO4.3H2O) and struvite (MgNH4PO4·6H2O) are becoming important alternatives to calcium phosphates in hard tissue replacements. So far, newberyite has received lesser attention with respect to struvite. Therefore, the broad aim of ...

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