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Morphotropic Phase Boundary in the Nanocrystalline PbZrxTi1-xO3 System

Published online by Cambridge University Press:  15 February 2011

R. S. Katiyar  and
J. F. Meng
R. S. Katiyar
Affiliation:
Department of Physics, University of Puerto Rico, San Juan, Puerto Rico 00931 –3343
J. F. Meng
Affiliation:
Department of Physics, University of Puerto Rico, San Juan, Puerto Rico 00931 –3343
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Abstract

Micro Raman spectra for PbZrxTi1-xO3 (PZT) with a grain size of 60 nm have been recorded. The results show that the lowest E(TO) phonon mode of PbTiO3 (soft mode) displays a decrease in frequency and increase in linewidth with increasing Zr concentration. A discontinuous behavior of the phonon energy of the soft mode occurs at x=0.4 and it can be attributed to a phase transformation from the tetragonal ferroelectric to rhombohedral ferroelectric phase in PZT. The coupling between the soft mode and an additional impurity mode, has been observed, which plays an important role in the phase transformation. A lowest phonon mode at 10 cm−1 is detected and it is found to exhibit an increase in intensity for x above 0.2. The grain size dependence of the mode seems to be associated with the effect of grain size on the microstructure in PZT. The mechanism of grain size - induced new morphotropic phase boundary, which is lower than that of the corresponding bulk materials, is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 452 , 1996 , 857
Copyright
Copyright © Materials Research Society 1997

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Footnotes

*

On leave from Department of Physics, Henan University, Kaifeng, P. R. China

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