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- W1051801390 abstract "Abstract A comprehensive theoretical investigation of the electronic band structure, density of states, electron charge density distribution and the optical properties for mixed alkali and alkaline-earth borate Li 2 Sr 4 B 12 O 23 (LSBO) single crystals were performed. The experimental geometrical structure was optimized by minimizing the forces acting on each atom. Calculations were performed using the full potential linear augmented plane wave plus local orbitals ( FPLAPW + lo ) method within the local density approximation ( LDA ), generalized gradient approximation ( GGA ) and the recently modified Becke–Johnson potential ( mBJ ). Our calculations show that LSBO crystal is a direct band gap semiconductor. The calculated band gap is 4.64 eV ( LDA ), 4.92 eV ( GGA ) and 5.51 eV ( mBJ ). An earlier calculation using the CASTEP code within LDA obtained a band gap of about 4.66 eV. To overcome the well-known LDA underestimation of the energy gap we have used GGA and mBJ . We find that mBJ succeed by large amount in bringing the calculated bond lengths in good agreement with the experimental data. Also we found that using mBJ to calculate the optical properties gives a birefringence of about 0.068 (at λ = 586.5 nm) in excellent agreement with the experimental data (0.068 at λ = 586.5 nm). Therefore, we believe that the mBJ calculations reported here show excellent agreement with the experimental data." @default.
- W1051801390 created "2016-06-24" @default.
- W1051801390 creator A5012100524 @default.
- W1051801390 date "2015-10-01" @default.
- W1051801390 modified "2023-09-27" @default.
- W1051801390 title "Mixed alkali and alkaline-earth borate Li2Sr4B12O23 single crystal" @default.
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- W1051801390 doi "https://doi.org/10.1016/j.optmat.2015.07.039" @default.
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