Unusual transformation from strong negative to positive thermal expansion in PbTiO3-BiFeO3 perovskite
Article
Article Title | Unusual transformation from strong negative to positive thermal expansion in PbTiO3-BiFeO3 perovskite |
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ERA Journal ID | 1019 |
Article Category | Article |
Authors | Chen, Jun (Author), Fan, Longlong (Author), Ren, Yang (Author), Pan, Zhao (Author), Deng, Jinxia (Author), Yu, Ranbo (Author) and Xing, Xianran (Author) |
Journal Title | Physical Review Letters |
Journal Citation | 110 (11), pp. 115901-1 |
Number of Pages | 5 |
Year | 2013 |
Place of Publication | United States |
ISSN | 0031-9007 |
1079-7114 | |
1092-0145 | |
Digital Object Identifier (DOI) | https://doi.org/10.1103/PhysRevLett.110.115901 |
Web Address (URL) | https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.110.115901 |
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. |
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 |
ANZSRC Field of Research 2020 | 510703. Particle physics |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | University of Science and Technology Beijing, China |
Argonne National Laboratory, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q427z/unusual-transformation-from-strong-negative-to-positive-thermal-expansion-in-pbtio3-bifeo3-perovskite
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