The role of spontaneous polarization in the negative thermal expansion of tetragonal PbTiO3-based compounds
Article
Article Title | The role of spontaneous polarization in the negative thermal expansion of tetragonal PbTiO3-based compounds |
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ERA Journal ID | 1359 |
Article Category | Article |
Authors | Chen, Jun (Author), Nittala, Krishna (Author), Forrester, Jennifer S. (Author), Jones, Jacob L. (Author), Deng, Jinxia (Author), Yu, Ranbo (Author) and Xing, Xianran (Author) |
Journal Title | Journal of the American Chemical Society |
Journal Citation | 133 (29), pp. 11114-11117 |
Number of Pages | 4 |
Year | 2011 |
Place of Publication | United States |
ISSN | 0002-7863 |
1520-5126 | |
Digital Object Identifier (DOI) | https://doi.org/10.1021/ja2046292 |
Web Address (URL) | http://pubs.acs.org/doi/abs/10.1021/ja2046292 |
Abstract | PbTiO3-based compounds are well-known ferroelectrics that exhibit a negative thermal expansion more or less in the tetragonal phase. The mechanism of negative thermal expansion has been studied by high-temperature neutron powder diffraction performed on two representative compounds, 0.7PbTiO3 - 0.3BiFeO3 and 0.7PbTiO3 - 0.3Bi(Zn1/2Ti1/2)O3, whose negative thermal expansion is contrarily enhanced and weakened, respectively. With increasing temperature up to the Curie temperature, the spontaneous polarization displacement of Pb/Bi (|zPb/Bi) is weakened in 0.7PbTiO3 - 0.3BiFeO3 but well-maintained in 0.7PbTiO3 - 0.3Bi(Zn1/2Ti1/2)O3. There is an apparent correlation between tetragonality (c/a) and spontaneous polarization. Direct experimental evidence indicates that the spontaneous polarization originating from Pb/Bi - O hybridization is strongly associated with the negative thermal expansion. This mechanism can be used as a guide for the future design of negative thermal expansion of phase-transforming oxides. |
Keywords | Experimental evidence; Future designs; High temperature; Negative thermal expansion; Representative compound; Spontaneous polarizations; Tetragonal phase; Tetragonality; General; Zinc and Alloys; Fluid Flow; Electromagnetic Waves in Different Media; Organic Compounds; Materials Science; Clinical and Experimental Biochemistry; |
ANZSRC Field of Research 2020 | 340699. Physical chemistry not elsewhere classified |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Science and Technology Beijing, China |
University of Florida, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q428y/the-role-of-spontaneous-polarization-in-the-negative-thermal-expansion-of-tetragonal-pbtio3-based-compounds
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