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Ferroelectric and proton conducting behavior of a new elpasolite-related vanadium oxyfluoride (NH4,K)3VO2F4

Published online by Cambridge University Press:  31 January 2011

Sadequa J. Patwe ,
S. Nagabhusan Achary ,
Kalpathy Ganapathy Girija ,
C.G. Sivan Pillai  and
Avesh K. Tyagi
Avesh K. Tyagi
Affiliation:
Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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Abstract

A new elpasolite-type (NH4,K)3VO2F4 compound was prepared and characterized by x-ray diffraction, differential scanning calorimeter (DSC), impedance analysis, and electrical polarization measurements. It crystallizes in an orthorhombic lattice with unit-cell parameters: a = 8.9584(4), b = 18.6910(14), c = 6.2174(4) Å, V = 1041.04(11) Å3, Z = 6. NH4+, and K+ ions are distributed statistically over crystallographically four equivalent sites. There are two distinguishable vanadium atoms forming cis- and trans-VO2F4 octahedra present in the unit cell. High-temperature studies by DSC and in situ x-ray diffraction revealed a first-order structural transformation from orthorhombic to cubic lattice around 343 K. Impedance measurements show two different kinds of conductivity behaviors for the two phases. In orthorhombic phase a significant conductivity resulting from involvement of protonic species is observed. In the orthorhombic phase, a clear ferroelectric hysteresis loop is observed.

Keywords

Phase transformationFerroelectricElectrical properties
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 7 , July 2010 , pp. 1251 - 1263
Copyright
Copyright © Materials Research Society 2010

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