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Microstructure-property relations in tungsten bronze lead barium niobate, Pb1−xBaxNb2O6

Published online by Cambridge University Press:  31 January 2011

C.A. Randall ,
R. Guo ,
A.S. Bhalla  and
L.E. Cross
C.A. Randall
Affiliation:
The Pennsylvania State University, Materials Research Laboratory, University Park, Pennsylvania 16802
R. Guo
Affiliation:
The Pennsylvania State University, Materials Research Laboratory, University Park, Pennsylvania 16802
A.S. Bhalla
Affiliation:
The Pennsylvania State University, Materials Research Laboratory, University Park, Pennsylvania 16802
L.E. Cross
Affiliation:
The Pennsylvania State University, Materials Research Laboratory, University Park, Pennsylvania 16802
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Abstract

Transmission electron microscopy (TEM) has been used to explore details of the structural phase transitions and corresponding microstructural features in the solid solution of Pb1−xBaxNb2O6 (PBN) tungsten bronze ferroelectrics at compositions embracing the morphotropic phase boundary between orthorhombic and tetragonal ferroelectric phases. In addition to the ferroelectric domain structures that were consistent with the expected symmetries, incommensurate ferroelastic phases were observed. The “onset” and “lock-in” transition temperatures are a function of the Pb/Ba ratio, and for lead-rich compositions it appears that the incommensurate distortion may occur above the ferroelectric Curie temperature in the paraelectric phase.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 8 , August 1991 , pp. 1720 - 1728
Copyright
Copyright © Materials Research Society 1991

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