Patwe, Sadequa J. ; Nagabhusan Achary, S. ; Girija, Kalpathy Ganapathy ; Pillai, C. G. Sivan ; Tyagi, Avesh K. (2010) Ferroelectric and proton conducting behavior of a new elpasolite-related vanadium oxyfluoride (NH4,K)3VO2F4 Journal of the Materials Research, 25 (07). pp. 1251-1263. ISSN 0884-2914
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Official URL: https://www.cambridge.org/core/journals/journal-of...
Related URL: http://dx.doi.org/10.1557/JMR.2010.0175
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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Cambridge University Press. |
| Keywords: | Phase Transformation; Ferroelectric; Electrical Properties |
| ID Code: | 108139 |
| Deposited On: | 01 Feb 2018 11:32 |
| Last Modified: | 01 Feb 2018 11:32 |
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