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Evolution of short-range to long-range monoclinic order of MB type with decreasing temperature in 0.75[Pb(Mg1/3Nb2/3)O3]-0.25PbTiO3.

Authors :
Singh, Akhilesh Kumar
Pandey, Dhananjai
Zaharko, Oksana
Source :
Journal of Applied Physics. 4/1/2006, Vol. 99 Issue 7, p076105. 3p. 1 Chart, 2 Graphs.
Publication Year :
2006

Abstract

Results of Rietveld analysis of powder neutron diffraction data on 0.75[Pb(Mg1/3Nb2/3)O3]-0.25PbTiO3 (PMN-0.25PT) at room temperature and 80 K are presented. It is shown that the currently believed structural model based on average rhombohedral structure (space group R3m) with local <110> disordered Pb atoms cannot account for the structure of PMN-0.25PT at 80 K. The low temperature structure of PMN-0.25PT is best refined using Cm space group of MB type. It is argued that with decreasing temperature the short-range monoclinic order at 300 K grows into a truly long-range ordered monoclinic structure at 80 K. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00218979
Volume :
99
Issue :
7
Database :
Academic Search Index
Journal :
Journal of Applied Physics
Publication Type :
Academic Journal
Accession number :
20517533
Full Text :
https://doi.org/10.1063/1.2188047