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Synthesis, structure and properties of new functional oxynitride ceramics

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Title: Synthesis, structure and properties of new functional oxynitride ceramics
Authors: Masubuchi, Yuji Browse this author →KAKEN DB
Keywords: Oxynitrides
Crystal structure
Neutron diffraction
Dielectric property
Optical properties
Issue Date: Feb-2013
Publisher: The Ceramic Society of Japan - 日本セラミックス協会
Journal Title: Journal of the Ceramic Society of Japan
Volume: 121
Issue: 1410
Start Page: 142
End Page: 149
Abstract: Novel metal oxynitrtides have been prepared by nitridation of amorphous metal oxide precursors obtained through citrate route. Their crystal structure, especially in O/N distribution and local bonding characteristics has been analyzed by using neutron diffraction, X-ray absorption and transmission electron microscopy, to investigate their electric and optical properties. In dielectric SrTaO2N, crystal structure refinement suggested the short range O/N ordering and local tilting of cis-TaO4N2 octahedra, resulting in its unusual large permittivity. Its dense ceramics were sintered with SrCO3 additive and exhibited superior dielectric constant above 1 x 10(4) at room temperature. New biphasic wurtzite and zinc-blende structure of gallium oxynitride nanowire was observed by using transmission electron microscopy. As-grown long gallium oxynitride nanowire exhibited a characteristic broad UV emission at 4.3 eV in its cathodoluminescene spectrum. New oxynitride phosphor having magnetoplumbite structure, LaAl12(O,N)(19):Eu showed photoluminescence emission peak splitting due to Eu2+ site splitting to two crystallographic sites induced by the two kinds of anions in its crystal structure.
Rights: ©2013 The Ceramic Society of Japan. All rights reserved.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鱒渕 友治

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