The crystal surface properties of potassium tantalite niobate,KTa_(0.5)Nb_(0.5)O_(3) (KTN),are studied with firstprinciples calculation based on the density functional theory (DFT).Generalized gradient approximation (GGA) functional analysis is also employed by using CASTEP software.The explanations for the differences of the ferroelectric and piezoelectric properties between the bulk and surface of the material are provided.The DFT with GGA is used to determine the structure and to calculate the electronic and optical properties of the chemically ordered KTa_(0.5)Nb_(0.5)O_(3) crystal (100),(110) and (111) surfaces.The results show that the surface properties are different from the bulk properties.The data obtained agree with the expected values and can serve as guidance for future experimental studies in the fields of photorefraction and nonlinear optics.
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机译：利用扫描穿隧显微镜探讨在硒化铟上未氧化表面和氧化表面之介面接合处的电子特性 =Scanning Tunneling Microscope study of InSe Surface Electronic Properties at the Fresh/Oxided Interface Junction
