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

Di Zhou; Huan-Huan Guo; Mao-Sen Fu; Xiao-Gang Yao; Hui-Xing Lin; Wen-Feng Liu; Li-Xia Pang; Charanjeet Singh; Sergei Trukhanov; Alex Trukhanov; Ian M. Reaney

doi:10.1039/D0QI00981D

Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb_0.9V_0.1)O₄†

Di Zhou,

*^a Huan-Huan Guo,^a Mao-Sen Fu,^b Xiao-Gang Yao,^c Hui-Xing Lin,^c Wen-Feng Liu,^d Li-Xia Pang,^e Charanjeet Singh,^f Sergei Trukhanov,^ghi Alex Trukhanov

^ghi and Ian M. Reaney*^j

Author affiliations

* Corresponding authors

^a Key Laboratory of Multifunctional Materials and Structures, Ministry of Education, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
E-mail: zhoudi1220@gmail.com

^b Shaanxi Materials Analysis and Research Center, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China

^c Key Laboratory of Inorganic Functional Material and Device, Shanghai Institute of Ceramics Chinese Academy of Sciences, Shanghai 200050, China

^d State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China

^e Micro-optoelectronic Systems Laboratories, Xi'an Technological University, Xi'an 710032, Shaanxi, China

^f School of Electronics and Communication Engineering, Lovely Professional University, Jalandhar, Punjab, India

^g National University of Science and Technology “MISiS”, Leninskii Av., 4, Moscow, Russia

^h South Ural State University, Lenin Av., 76, Chelyabinsk, Russia

ⁱ Scientific and Practical Materials Research Center of the NAS of Belarus, P. Brovki Str., 19, Minsk, Belarus

^j Department of Materials Science and Engineering, University of Sheffield, UK
E-mail: i.m.reaney@sheffield.ac.uk

Abstract

La(Nb_0.9V_0.1)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 (T_M–T) at 350 °C, accompanied by 3.55% spontaneous strain and an abrupt change in the thermal expansion coefficient (α_L) 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 (ε_r) at T_M–T is predicted from the Clausius–Mosotti relation and Shannon's additive rule. Such an anomalous decrease in ε_r 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.

Inorganic Chemistry Frontiers

Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb_0.9V_0.1)O₄†

Abstract

Supplementary files

Article information

Download Citation

Permissions

Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb_0.9V_0.1)O₄

Social activity

Search articles by author

Spotlight

Advertisements

Inorganic Chemistry Frontiers