种姓
密度泛函理论
带隙
直接和间接带隙
氧化物
电子结构
材料科学
局部密度近似
钙钛矿(结构)
电子能带结构
混合功能
态密度
化学
凝聚态物理
计算化学
结晶学
冶金
光电子学
物理
作者
Sara Rahman,Abid Hussain,Shahzadi Noreen,Nazia Bibi,Saira Arshad,Jalil Ur Rehman,Muhammad Bilal Tahir
标识
DOI:10.1016/j.jssc.2022.123650
摘要
The structural, electronic, optical and mechanical properties for oxide-based cubic perovskites ABO3 (A = Nd, Cu and B= Sc, Sn) were investigated employing density functional theory (DFT) within the CASTEP (Cambridge Serial Total Energy Package) code, based on ultra-soft pseudo-potential (USP) plane wave and Perdew Burke Ernzerhof (PBE) exchange-correlation functional of Generalized Gradient Approximation (GGA) and Local Density Approximation (LDA). The structural results showed that all compounds are stable. The computed elastic constants also meet the requirements of mechanical stability, hardness, ductile/brittle and bonding nature of materials. All the compounds have anisotropic nature. The electronic band structure calculations show that CuScO3 and CuSnO3 compounds have indirect band gap nature. NdScO3 compound has a direct band gap and NdSnO3 compounds show metallic behavior. All the compounds were identified as semiconductors, except NdSnO3 compounds. The band gap values were in the best agreement with the information that is already available. Partial density of states (PDOS) and total density of states (TDOS) were employed to measure the degree of localized electrons in different bands. The optical transition in the compounds was computed by fitting the dispersion relation of the imagined component. Optical properties showed that these compounds were excellent absorbers of incident radiation. Therefore, it may be assumed that these compounds could be in employment in optoelectronics to capture the ultraviolet range of solar radiations.
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