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Studies on Local Structural Inhomogeneity and Origin ofFerroelectricity in Yttrium chromite Ceramics

Published online by Cambridge University Press:  28 March 2016

Venkateswara rao Mannepalli  and
Ranjith Ramadurai
Venkateswara rao Mannepalli
Affiliation:
Department of Materials science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana, India - 502285
Ranjith Ramadurai*
Affiliation:
Department of Materials science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana, India - 502285
*
*Corresponding author: [email protected]
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Abstract

YCrO3 (YCO) is known to be a multiferroic with orthorhombic,Pnma, structure with center of inversion. However, thelocal structural inhomogeneity in this compound is believed to give rise toferroelectric behavior. In this study we explore high temperature Ramaninvestigations of YCO and observed that one of its Raman mode B3g (3)(CrO6 Octahedral tilt mode) softens around the structural phasetransition which could be the origin of ferroelectric nature in YCO. Inaddition, we substitute bismuth (Bi) in YCO to understand the structuraldistortions that lead to local structural inhomogeneity. Besides B3g(3) mode softening with composition and high temperature studies inY1-xBixCrO3 the study reveals thestructural distortions and the structural tunability Bi offers in suchsystems.

Keywords

Raman spectroscopyferroelectricitychemical substitution
Type
Articles
Information
MRS Advances , Volume 1 , Issue 9: Electronics and Photonics , 2016 , pp. 609 - 614
Copyright
Copyright © Materials Research Society 2016 

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