Anomalous dielectric behaviour at the monoclinic to tetragonal phase transition in La(Nb0.9V0.1)O4

Abstract

La(Nb0.9V0.1)O4 has been shown by in-situ Raman spectra and X-ray diffraction to undergo a ferroelastic phase transition from monoclinic fergusonite to tetragonal scheelite (TM-T) at 350 oC, accompanied by 3.55% spontaneous strain and an abrupt change in thermal expansion coefficient (αL) from +15.5 ppm/oC to +11.4 ppm/oC. Assuming a linear relation between polarizability and temperature, an anomalous decrease in relative permittivity (εr) at TM-T is predicted from the Clausius–Mosotti relation and Shannon’s additive rule. Such an anomalous decrease in εr at a phase transition has not previously been observed in ferroic and linear dielectrics and may aid in the design of novel microwave dielectric composites.

Metadata

Authors/Creators:	Zhou, D. Guo, H.-H. Fu, M.S. Yao, X. Lin, H. Liu, W. Pang, L.-X. singh, C. Trukhanov, S. Trukhanov, A. Reaney, I.M. https://orcid.org/0000-0003-3893-6544
Copyright, Publisher and Additional Information:	© 2020 Royal Society of Chemistry. This is an author-produced version of a paper subsequently published in Inorganic Chemistry Frontiers. Uploaded in accordance with the publisher's self-archiving policy.
Dates:	Accepted: 23 October 2020 Published (online): 27 October 2020 Published: 7 January 2021
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	05 Nov 2020 11:42
Last Modified:	08 Feb 2022 13:19
Status:	Published
Publisher:	Royal Society of Chemistry (RSC)
Refereed:	Yes
Identification Number:	https://doi.org/10.1039/d0qi00981d

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Anomalous dielectric behaviour at the monoclinic to tetragonal phase transition in La(Nb0.9V0.1)O4

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