Anomalous synchrotron x-ray scattering studies of nanodomains in Pb(Mg1/3Nb2/3)O3

A. Tkachuk, Haydn Chen, P. Zschack, E. Colla

研究成果: Conference contribution同行評審

1 引文 斯高帕斯(Scopus)

摘要

A systematic study of the temperature dependence of superlattice reflections in the reciprocal space of a single crystal Pb(Mg1/3Nb22/3)O3 (PMN) was performed using anomalous x-ray scattering technique. Our studies confirm the existence of the two types of nanoregioris in PMN: a) chemically ordered nanodomains, and h) polar nanodomains formed by short-range correlated ionic displacements. No detailed temperature dependence of these superlattice reflections has been reported in the past. From monitoring the superlatttice reflections corresponding to polar nanodomains (i.e. QJ spots) over the temperature range 15K-800K, we found freezing temperature (Tf) of correlated atomic displacements was near 200 K. In contrast, chemically ordered nanodomains, which give rise to F type superlattice peaks, exhibited spherical shape over the entire temperature interval 15-800 K, This leads us to suspect that chemically ordered regions might be different and independent of polar nanodomains. In this paper we explain the contributions of different atomic displacements to a and F superlattice reflections in PMN. Correlation and competition between Pb displacements and the tilting of oxygen octahedra network are presented to understand the microstructural origin of the relaxor ferroelectric behavior.

原文English
主出版物標題Fundamental Physics of Ferroelectrics 2000
主出版物子標題Aspen Center for Physics Winter Workshop
編輯Ronald E. Cohen, Richard A. Mewaldt
發行者American Institute of Physics Inc.
頁面136-142
頁數7
ISBN(電子)1563969599
DOIs
出版狀態Published - 12 九月 2000
事件Aspen Center for Physics Winter Workshop on Fundamental Physics of Ferroelectrics 2000 - Aspen, United States
持續時間: 13 二月 200020 二月 2000

出版系列

名字AIP Conference Proceedings
535
ISSN(列印)0094-243X
ISSN(電子)1551-7616

Conference

ConferenceAspen Center for Physics Winter Workshop on Fundamental Physics of Ferroelectrics 2000
國家/地區United States
城市Aspen
期間13/02/0020/02/00

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