Bragg Diffraction and Its Simulation of Ba TiO3/SrTiO3Superlattices

  • Ba TiO3/SrTiO3(BTO/STO)superlattices were examined by using X-ray agazing grazing incidence diffraction under total external reflection conditions and ordinary Bragg diffraction.Dynamical diffraction theory was used to simulate Bragg diffractions.It is shown that,these superlattices partially relaxed.However,unlike semiconductor epilayers or superlattices,the lattice constants of BTO/STO superlattices do not completely obey the role of tetragonal distortion.The perpendicular lattice constants deviate slightly from that predicted by elasticity theory.These deviations are probably relevant to the structures of oxide materials.
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  • [1] . CUI Da-Fu et al. J. Vac. Sci. Technol, 1997, AIS(2):2752 Tabata H, Kawai工Appl. Phys. Lett., 1997, 70(3):3213 MAI Z H, CUI S F, HE C G. Phys. Rev., 1990, B41(14):99304 LI J H, MAI Z H, CUI S F. J. Appi. Phys., 1994, 76(2):8105 Terauchi H et al. J. Phys. Soci. Japan, 1992, 61(7):21946 ZHAO T et al. J. Appl. Phys., 2000, 87:7442
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CUI Shu-Fan, LUO Guang-Ming, YU Wen-Xue, CHEN Xiang-Ming, LIU Cui-Xiu, LI Ming, MAI Zhen-Hong, LU Hui-Bin, CHEN Zheng-Hao, JIA Quan-Jie, ZHENG Wen-Li and JIANG Xiao-Ming. Bragg Diffraction and Its Simulation of Ba TiO3/SrTiO3Superlattices[J]. Chinese Physics C, 2001, 25(S1): 100-105.
CUI Shu-Fan, LUO Guang-Ming, YU Wen-Xue, CHEN Xiang-Ming, LIU Cui-Xiu, LI Ming, MAI Zhen-Hong, LU Hui-Bin, CHEN Zheng-Hao, JIA Quan-Jie, ZHENG Wen-Li and JIANG Xiao-Ming. Bragg Diffraction and Its Simulation of Ba TiO3/SrTiO3Superlattices[J]. Chinese Physics C, 2001, 25(S1): 100-105. shu
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Received: 1900-01-01
Revised: 1900-01-01
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Bragg Diffraction and Its Simulation of Ba TiO3/SrTiO3Superlattices

    Corresponding author: CUI Shu-Fan,
  • Institute of Physics & Center for Condensed Matter Physics,CAS,Beijing 100080,China2 Laboratory of Optical Physics,Institute of Physics & Center for Condensed Matter Physics,CAS,Beijing 100080,China3 Institue of High Energy Physics,CAS,Beijing 100039,China

Abstract: Ba TiO3/SrTiO3(BTO/STO)superlattices were examined by using X-ray agazing grazing incidence diffraction under total external reflection conditions and ordinary Bragg diffraction.Dynamical diffraction theory was used to simulate Bragg diffractions.It is shown that,these superlattices partially relaxed.However,unlike semiconductor epilayers or superlattices,the lattice constants of BTO/STO superlattices do not completely obey the role of tetragonal distortion.The perpendicular lattice constants deviate slightly from that predicted by elasticity theory.These deviations are probably relevant to the structures of oxide materials.

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