Constant-wavelength neutron diffraction study of cubic perovskites BaTaO2N and BaNbO2N

Title
Constant-wavelength neutron diffraction study of cubic perovskites BaTaO2N and BaNbO2N
Author(s)
김영일이은혜[이은혜]
Keywords
DIELECTRIC-PROPERTIES; VISIBLE-LIGHT; SR; BA; CA
Issue Date
201105
Publisher
CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI
Citation
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, v.119, no.1389, pp.371 - 374
Abstract
Local structural disorder of perovskite oxynitrides BaTaO2N and BaNbO2N is investigated by constant-wavelength neutron powder diffraction measurements at 300 and 6 K. Temperature-dependent diffraction line-broadening analyses together with the Rietveld refinements confirm that both perovskites retain average structures of simple cubic symmetry down to 6K. While the Ta and Nb atoms in the above oxynitrides have remarkably large displacement parameters, indicative of pronounced octahedral distortions, the rigidity of Ba sublattice seems to suppress the cooperative propagation of long-range octahedral tilting. (C) 2011 The Ceramic Society of Japan. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/25253http://dx.doi.org/10.2109/jcersj2.119.371
ISSN
1882-0743
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이과대학 > 화학생화학부 > Articles
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