An unusual temperature induced isostructural phase transition in a scheelite, Li0.5Ce0.5MoO4

Saha, Dipankar and Ranjan, Rajeev and Swain, Diptikanta and Narayana, Chandrabhas and Row, Guru Tayur N (2013) An unusual temperature induced isostructural phase transition in a scheelite, Li0.5Ce0.5MoO4. In: Dalton Transactions, 42 (21). pp. 7672-7678.

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Abstract

High resolution synchrotron X-ray diffraction, dielectric and Raman scattering study of a scheelite compound Li0.5Ce0.5MoO4 (LCM) revealed that it transforms to a self similar structure above 400 degrees C. The thermally induced isostructural phase transition (IPT), a phenomenon which has rarely been reported in the literature, is preceded by partial softening of the zone centre phonons followed by their hardening above the IPT transition temperature. The high temperature isostructural phase, which exhibits expanded lattice parameters and cell volume, nucleates and grows in the low temperature matrix over a very wide temperature range. Both the phases show nearly identical thermal expansion suggesting similarities in symmetry, unaltered coordination environments around the atoms across the transition.

Item Type:	Journal Article
Publication:	Dalton Transactions
Publisher:	Royal Society of Chemistry
Additional Information:	Copyright of this article belongs to Royal Society of Chemistry.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	18 Jun 2013 11:48
Last Modified:	18 Jun 2013 11:48
URI:	http://eprints.iisc.ac.in/id/eprint/46733

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