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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.121  No.1410 (February) (2013)  >  pp.142-149

Journal of the Ceramic Society of Japan
<<Previous article Vol.121  No.1410 (February) (2013)   pp.142 - 149 Next article>>

Synthesis, structure and properties of new functional oxynitride ceramics

Yuji MASUBUCHI1)
1) Faculty of Engineering, Hokkaido University

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 × 104 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.


Keyword:
Oxynitrides, Crystal structure, Neutron diffraction, Dielectric property, Optical properties

Received: October 01, 2012
Accepted: November 13, 2012 , Published online: February 01, 2013
Copyright © 2013 The Ceramic Society of Japan

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