First-Principles Study of Electronic Structure and Optical Properties of Cubic Perovskite CsCaF_(3)  

作　　者：K.Ephraim Babu A.Veeraiah D.Tirupati Swamy V.Veeraiah 

机构地区：[1]Modelling and Simulation in Materials Science Laboratory,Department of Physics,Andhra University,Visakhapatnam,Andhra Pradesh,530003,India

出　　处：《Chinese Physics Letters》2012年第11期173-177,共5页中国物理快报（英文版）

摘　　要：Electronic,structural and optical properties of the cubic perovskite CsCaF_(3) are calculated by using the full potential linearized augmented plane wave(FP-LAPW)plus local orbitals method with generalized gradient approximation(GGA)in the framework of the density functional theory.The calculated lattice constant is in good agreement with the experimental result.The electronic band structure shows that the fundamental band gap is wide and indirect at(Γ–R)point.The contribution of the different bands is analyzed from the total and partial density of states curves.The charge density plots show strong ionic bonding in Cs-F,and ionic and weak covalent bonding between Ca and F.Calculations of the optical spectra,viz.,the dielectric function,optical reflectivity,absorption coefficient,real part of optical conductivity,refractive index,extinction coefficient and electron energy loss,are performed for the energy range 0–30 eV.

关 键 词：THEORY BONDING IONIC 

分 类 号：O61[理学—无机化学]