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- W2952024257 abstract "The exchange-correlation functions of local density approximation and generalized gradient approximation using density functional theory were performed to calculate electronic and optical properties of lithium niobate crystal. To correct the underestimated value of band gap, a reverse scissor correction procedure was performed based on the experimental refractive index value because it is more suitable for compound with polar crystal. It is found that underestimated electronic band gap ∼4.76 eV was generated due to nature of generalized gradient approximation (GGA) exchange correlation. Based on density of states calculation, Li ion tends to diffuse into substrate as it possesses pure ionic character. Thus, the chemical bonding in LiNbO3 crystal has a mixed covalent-ionic character. The effect of strain on a-axis of the crystal and thus, its electronic and optical properties were investigated. The a-axis of the crystal is more sensitive towards the strain compared to c-axis as the band gap largely changes upon the applied strain. The optical properties such as dielectric function, refractive index, extinction coefficient, and absorption were calculated and explained in detail. The positive and negative strains do shift the optical spectrum either to higher or lower frequency depending on specific properties. These results would assist to provide the fundamental explanation about the effect of strain on the properties of lithium niobate crystal." @default.
- W2952024257 created "2019-06-27" @default.
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- W2952024257 date "2019-10-18" @default.
- W2952024257 modified "2023-09-28" @default.
- W2952024257 title "Effects of strain on electronic and optical properties of LiNbO<sub>3</sub>: a first principles study" @default.
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- W2952024257 doi "https://doi.org/10.1088/2053-1591/ab2a24" @default.
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