Ab-initio study on the absorption spectrum of color change sapphire based on first-principles calculations with considering lattice relaxation-effect

International Conference on Chemistry and Material Science 2017

化学;材料科学

Novita, Mega^1 ; Nagoshi, Hikari^2 ; Sudo, Akiho^2 ; Ogasawara, Kazuyoshi^2

Faculty of Engineering and Informatics, University of PGRI Semarang, Jl. Sidodadi-Timur No.24, Semarang, Central Java

50232, Indonesia^1

School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen Sanda, Hyogo

669-1337, Japan^2

关键词: Band structure calculation;    Configuration dependences;    Correlation corrections;    Energy correction;    Experimental parameters;    First-principles calculation;    Geometry optimization;    Lattice relaxation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/299/1/012060/pdf
DOI  :  10.1088/1757-899X/299/1/012060

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this study, we performed an investigation on α-Al2O3: V3+material, or the so-called color change sapphire, based on first-principles calculations without referring to any experimental parameter. The molecular orbital (MO) structure was estimated by the one-electron MO calculations using the discrete variational-Xα (DV-Xα) method. Next, the absorption spectra were estimated by the many-electron calculations using the discrete variational multi-electron (DVME) method. The effect of lattice relaxation on the crystal structures was estimated based on the first-principles band structure calculations. We performed geometry optimizations on the pure α-Al2O3and with the impurity V3+ion using Cambridge Serial Total Energy Package (CASTEP) code. The effect of energy corrections such as configuration dependence correction and correlation correction was also investigated in detail. The results revealed that the structural change on the α-Al2O3: V3+resulted from the geometry optimization improved the calculated absorption spectra. By a combination of both the lattice relaxation-effect and the energy correction-effect improve the agreement to the experiment fact.