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First-principles study of structural stability and elastic property of pre-perovskite PbTiO3 |
Liu Yong(刘涌)a)b), Ni Li-Hong(倪利红)a), Ren Zhao-Hui(任召辉)a), Xu Gang(徐刚)a), Li Xiang(李翔)a), Song Chen-Lu(宋晨路)a)†, and Han Gao-Rong(韩高荣)a) |
a State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; b Angstrom Center, Institute of Inorganic and Nonmetal Materials, Zhejiang University, Hangzhou 310027, China |
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Abstract The structural stability and the elastic properties of a novel structure of lead titanate, which is named pre-perovskite PbTiO3 (PP-PTO) and is constructed with TiO6 octahedral columns arranged in a one-dimensional manner, are investigated by using first-principles calculations. PP-PTO is energetically unstable compared with conventional perovskite phases, however it is mechanically stable. The equilibrium transition pressures for changing from pre-perovskite to cubic and tetragonal phases are -0.5 GPa and -1.4 GPa, respectively, with first-order characteristics. Further, the differences in elastic properties between pre-perovskite and conventional perovskite phases are discussed for the covalent bonding network, which shows a highly anisotropic character in PP-PTO. This study provides a crucial insight into the structural stabilities of PP-PTO and conventional perovskite.
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Received: 03 April 2011
Revised: 17 August 2011
Accepted manuscript online:
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PACS:
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62.20.D-
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(Elasticity)
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64.60.My
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(Metastable phases)
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77.80.B-
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(Phase transitions and Curie point)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51002135). |
Cite this article:
Liu Yong(刘涌), Ni Li-Hong(倪利红), Ren Zhao-Hui(任召辉), Xu Gang(徐刚), Li Xiang(李翔), Song Chen-Lu(宋晨路), and Han Gao-Rong(韩高荣) First-principles study of structural stability and elastic property of pre-perovskite PbTiO3 2012 Chin. Phys. B 21 016201
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