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• W2769883497 abstract "Electronic, structural and elastic properties of fresnoite, (BTSO), are obtained via first principles calculations. The electronic properties having been comparatively analysed using both the generalised gradient approximation and the hybrid functional method. The indirect band gap of BTSO is found to change significantly through the choice of functional; it shows an increase from 3.79 eV to 5.72 eV. A small indirect gap of 0.33 eV is also present directly above the conduction band edge, which allows for small optical transitions similar to that of defect transitions. The titanium orbitals are dominant near the conduction band edge, with oxygen orbitals being the main contributor to the valence band edge. Dielectric and elastic properties of the material are also obtained, with the bulk modulus being 131.73 GPa and the elastic moduli along the [1 0 0] and [0 0 1] directions being 180.57 GPa and 102.56 GPa, respectively. Theoretical values for Raman frequencies are reported for BTSO. Finally, Bader charge analysis reveals the barium and titanium atoms in BTSO are comparable to their charges in . However, due to the presence of the Si–O bonds, oxygen exhibits a significant charge redistribution. Through the choice of functional, charge can become more localised on the oxygen atoms." @default.
• W2769883497 created "2017-12-04" @default.
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• W2769883497 date "2017-12-18" @default.
• W2769883497 modified "2023-10-16" @default.
• W2769883497 title "First principles electronic and elastic properties of fresnoite Ba₂TiSi₂O₈" @default.
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• W2769883497 doi "https://doi.org/10.1088/2053-1591/aa99e8" @default.
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