Issue 1, 2021

Anomalous dielectric behaviour during 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 spectroscopy and X-ray diffraction to undergo a ferroelastic phase transition from monoclinic fergusonite to tetragonal scheelite (TM–T) at 350 °C, accompanied by 3.55% spontaneous strain and an abrupt change in the thermal expansion coefficient (αL) from +15.5 ppm °C−1 to +11.4 ppm °C−1. Assuming a linear relationship 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 in a phase transition has not previously been observed in ferroic and linear dielectrics and may aid in the design of novel microwave dielectric composites.

Graphical abstract: Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb0.9V0.1)O4

Supplementary files

Article information

Article type
Research Article
Submitted
13 Aug 2020
Accepted
23 Oct 2020
First published
27 Oct 2020

Inorg. Chem. Front., 2021,8, 156-163

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

D. Zhou, H. Guo, M. Fu, X. Yao, H. Lin, W. Liu, L. Pang, C. Singh, S. Trukhanov, A. Trukhanov and I. M. Reaney, Inorg. Chem. Front., 2021, 8, 156 DOI: 10.1039/D0QI00981D

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