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Xue Weidong, Li Yanrong, Yang Chun. First Principle Studies on Fine Structure for Bax Sr1-x TiO3[J]. Chinese Journal of Chemical Physics , 2005, 18(2): 179-182. DOI: 10.1088/1674-0068/18/2/179-182
Citation: Xue Weidong, Li Yanrong, Yang Chun. First Principle Studies on Fine Structure for Bax Sr1-x TiO3[J]. Chinese Journal of Chemical Physics , 2005, 18(2): 179-182. DOI: 10.1088/1674-0068/18/2/179-182
shu

First Principle Studies on Fine Structure for Bax Sr1-x TiO3

  • 1.

    College of Microelectronics and Solid State Electronics, University of Electronic Science and Technology of China, Chengdu 610054; Department of Chemistry, Sichuan Normal University, Chengdu 610066

  • 2.

    College of Microelectronics and Solid State Electronics, University of Electronic Science and Technology of China, Chengdu 610054

  • 3.

    College of Microelectronics and Solid State Electronics, University of Electronic Science and Technology of China, Chengdu 610054

Funds: Project supported by the Sichuan Provincial Key Research Program (2003A083) and Sichuan Provincial Applied Basic Research (03JY029-052-1)
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  • Received Date: February 14, 2004
    Graphical Abstract
    • Abstract
  • In order to study the changing process of Barium strontium titanate (BaxSr1-xTiO3， BST) from cubic phase to the tetragonal phase with Ba doping and the ferroelectric characteristic of BST, the total energy of BST with different mole ratio of Ba/Sr when Ba doped was calculated and the fine structure determined， based on general gradient approximation， by means of ultrasoft pseudopotentials plane wave method. It is demonstrated that in BST, the cell volume expands and the value of c to a increases when Ba doped, which cartributed to the separation of positive and negative ions and selfpolarization. The tetragonal Ba0.8Sr0.2TiO3 behaved as ferroelectric when the offcenter displacement of Ti was up to 8 pm along 001
    direction.
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