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First-principles study of the relaxor ferroelectricity of Ba(Zr, Ti)O3 |
Yang Li-Juan (杨丽娟)a b, Wu Ling-Zhi (武灵芝)c, Dong Shuai (董帅)b |
a School of Information Science and Technology, Suqian College, Suqian 223800, China; b Department of Physics, Southeast University, Nanjing 211189, China; c School of Geography and Biological Information, Nanjing University of Posts and Telecommunications, Nanjing 210046, China |
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Abstract Ba(Zr, Ti)O3 is a lead-free relaxor ferroelectric. Using the first-principles method, the ferroelectric dipole moments for pure BaTiO3 and Ba(Zr, Ti)O3 supercells are studied. All possible ion configurations of BaZr0.5Ti0.5O3 and BaZr0.25Ti0.75O3 are constructed in a 2× 2× 2 supercell. For the half-substituted case, divergence of ferroelectric properties is found from these structures, which greatly depends on the arrangements of Ti and Zr ions. Thus our results provide a reasonable explanation to the relaxor behavior of Ba(Zr, Ti)O3. In addition, a model based on the thermal statistics gives the averaged polarization for Ba(Zr, Ti)O3, which depends on the temperature of synthesis. Our result is helpful to understand and tune the relaxor ferroelectricity of lead-free Ba(Zr, Ti)O3.
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Received: 22 August 2015
Revised: 28 September 2015
Accepted manuscript online:
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PACS:
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77.22.Ej
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(Polarization and depolarization)
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77.55.fe
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(BaTiO3-based films)
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77.80.Jk
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(Relaxor ferroelectrics)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51322206 and 11274060) and the Natural Science Foundation of Jiangsu Province, China (Grant No. 15KJB140009). |
Corresponding Authors:
Dong Shuai
E-mail: sdong@seu.edu.cn
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Cite this article:
Yang Li-Juan (杨丽娟), Wu Ling-Zhi (武灵芝), Dong Shuai (董帅) First-principles study of the relaxor ferroelectricity of Ba(Zr, Ti)O3 2015 Chin. Phys. B 24 127702
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