Local cationic ordering behavior in Ba(Mg1/3Nb2/3)O-3 ceramics

Authors
Kim, YWPark, JHPark, JG
Issue Date
2004-05
Publisher
ELSEVIER SCI LTD
Citation
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.24, no.6, pp.1775 - 1779
Abstract
We have studied the effect of sintering temperature and time on cationic ordering in BaMg1/3Nb2/3O3 (BMN) microwave dielectric ceramics using transmission electron microscopy. Energy-dispersive spectroscopy was used to analyze the local chemical compositions. It is revealed that according to the sintering conditions the BMN ceramics show diverse local cationic ordering behavior, such as the development of domain twinning and 'core-shell'-structured grains and the formation of local disordered domains, although generally having 1:2 cation ordering structure. The disordered structure is formed in Mg-excess regions. Such local chemical variation seems to be caused by the formation of BaNb2O6 second phase in the neighboring grain boundary. Microwave dielectric properties of the ceramics will also be discussed in relation to the structural variation. (C) 2003 Elsevier Ltd. All rights reserved.
Keywords
DIELECTRIC-PROPERTIES; BA(NI1/3NB2/3)O-3; DIELECTRIC-PROPERTIES; BA(NI1/3NB2/3)O-3; capacitors; dielectric properties; electron microscopy; perovskites; sintering
ISSN
0955-2219
URI
https://pubs.kist.re.kr/handle/201004/137632
DOI
10.1016/S0955-2219(03)00595-8
Appears in Collections:
KIST Article > 2004
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