Unusual transformation from strong negative to positive thermal expansion in PbTiO3-BiFeO3 perovskite

Chen, Jun and Fan, Longlong and Ren, Yang and Pan, Zhao and Deng, Jinxia and Yu, Ranbo and Xing, Xianran (2013) Unusual transformation from strong negative to positive thermal expansion in PbTiO3-BiFeO3 perovskite. Physical Review Letters, 110 (11). pp. 115901-1. ISSN 0031-9007

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Abstract

Tetragonal PbTiO3-BiFeO3 exhibits a strong negative thermal expansion in the PbTiO3-based ferroelectrics that consist of one branch in the family of negative thermal expansion materials. Its strong negative thermal expansion is much weakened, and then unusually transforms into positive thermal expansion as the particle size is slightly reduced. This transformation is a new phenomenon in the negative termal expansion materials. The detailed structure, temperature dependence of unit cell volume, and lattice dynamics of PbTiO3-BiFeO3 samples were studied by means of high-energy synchrotron powder diffraction and Raman spectroscopy. Such unusual transformation from strong negative to positive thermal expansion is highly associated with ferroelectricity weakening. An interesting zero thermal expansion is achieved in a wide temperature range (30-500 C) by adjusting particle size due to the negative-to-positive transformation character. The present study provides a useful method to control the negative thermal expansion not only for ferroelectrics but also for those functional materials such as magnetics and superconductors.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to Published version allowed due to publisher copyright policy.
Faculty / Department / School: No Faculty
Date Deposited: 29 Sep 2017 02:55
Last Modified: 29 Sep 2017 03:55
Uncontrolled Keywords: negative thermal expansion; negative thermal expansion material; synchrotron powder diffraction; temperature dependence; unit-cell volume; wide temperature ranges; zero thermal expansion; fluid flow; light and optics; solid state physics; crystal lattice; mechanical variables measurements
Fields of Research : 02 Physical Sciences > 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics > 020203 Particle Physics
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1103/PhysRevLett.110.115901
URI: http://eprints.usq.edu.au/id/eprint/31973

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