Phase transformation and negative thermal expansion in TaVO5
Article
Article Title | Phase transformation and negative thermal expansion in TaVO5 |
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ERA Journal ID | 1525 |
Article Category | Article |
Authors | Wang, Xiaowei (Author), Huang, Qingzhen (Author), Deng, Jinxia (Author), Yu, Ranbo (Author), Chen, Jun (Author) and Xing, Xianran (Author) |
Journal Title | Inorganic Chemistry: including bioinorganic chemistry |
Journal Citation | 50 (6), pp. 2685-2690 |
Number of Pages | 6 |
Year | 2011 |
Place of Publication | United States |
ISSN | 0020-1669 |
1520-510X | |
Digital Object Identifier (DOI) | https://doi.org/10.1021/ic200003n |
Web Address (URL) | http://pubs.acs.org/doi/abs/10.1021/ic200003n |
Abstract | Two phase transformations of TaVO5 were observed by DSC and/or dilatometry measurements in the studied temperature range. X-ray diffraction and neutron powder diffraction structure refinements indicated a phase transformation at-14 °C from a monoclinic symmetry with space group P2 1/c to an orthorhombic symmetry with space group Pnma above this temperature. The rigid TaO6 octahedron in orthorhombic phase becomes nonregular at-14 °C, which results in the transition from Pnma to P2 1/c. TaVO5 was found to be a negative thermal expansion material above room temperature. The calculated volumetric thermal expansion coefficients (TECs) are-8.92 × 10-6 °C-1 in the range of 20-600 °C, and-2.19 × 10-5 °C-1 above 600 °C, respectively. The negative thermal expansion behavior is accounted for by the tilt of the TaO6 and VO4 polyhedra, where the shrinkage of the VO4 tetrahedra result in the increase of Ta-O-V angles on heating, while the angle of Ta-O1-Ta maintains at 180° in the framework. |
ANZSRC Field of Research 2020 | 340201. Bioinorganic chemistry |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Science and Technology Beijing, China |
National Institute of Standards and Technology, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4291/phase-transformation-and-negative-thermal-expansion-in-tavo5
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