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Phase transformation and Raman spectra in BaTiO3 nanocrystals

Published online by Cambridge University Press:  01 February 2011

Jian Yu ,
X. J. Meng ,
J.L. Sun ,
G.S. Wang  and
J.H. Chu
Jian Yu
Affiliation:
National Laboratory for Infrared Physiscs, Shanghai Institute of Technical Physics Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai 200083 China
X. J. Meng
Affiliation:
National Laboratory for Infrared Physiscs, Shanghai Institute of Technical Physics Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai 200083 China
J.L. Sun
Affiliation:
National Laboratory for Infrared Physiscs, Shanghai Institute of Technical Physics Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai 200083 China
G.S. Wang
Affiliation:
National Laboratory for Infrared Physiscs, Shanghai Institute of Technical Physics Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai 200083 China
J.H. Chu
Affiliation:
National Laboratory for Infrared Physiscs, Shanghai Institute of Technical Physics Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai 200083 China
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Abstract

In this paper, size-induced ferroelectricit yweakening, phase transformation, and anomalous lattice expansion are observed in nanocrystalline BaTiO3 (nc-BaTiO3) deriv ed b y low temperature hydrothermal methods, and they are w ellunderstood using the terms of the long-range interaction and its cooperative phenomena altered by particle size in covalen t ionic nanocrystals. In cubic nc-BaTiO3, five modes centerd at 186, 254, 308, 512 and 716 cm-1 are observed Raman active in cubic nanophase, and they are attributed to local rhombohedral distortion breaking inversion-symmetry in cubic nanophase. The254 and 308 cm-1 modes are significantly affected not only by the concentration of hydroxyl defects, but also their particular configuration. And the 806 cm-1 modes found to be closely associated with OH - absorbed on grain boundaries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 718: Symposium D – Perovskite Materials , 2002 , D10.7
Copyright
Copyright © Materials Research Society 2002

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