A FIRST-PRINCIPLES STUDY EFFECT PRESSURE OF ELECTRONIC AND OPTICAL PROPERTIES OF R-TiO2
DOI:
https://doi.org/10.15421/jchemtech.v32i1.289257Keywords:
first principle; Ultrasoft pseudopotential; Density of states; Refractive index; Hydrostaticpressure.Abstract
The band structure, density of state, and optical properties of TiO2 rutile were studied using first principles calculations within the framework of density functional theory using the generalized gradient approximation (GGA-RPBE) at both zero and high pressures. we used the Birch-Murnaghan equation of state calculate of volume and bulk modulus by approximation that we mentioned above and our results were compared with previous theoretical and experimental data, we noticed a good agreement between the results. The band gap of 2.098 eV (GGA) remains unchanged when the pressure is increased from 0 to 10 GPa, indicating an underestimation. The reduction in volume and lattice constants with increasing pressure is responsible for the decrease in band gap. There is a good agreement between the experimental results and the dielectric constant ε (ω) and refractive index. The photocatalytic activity of TiO2 is found to decrease with increasing pressure based on the absorption spectrum. The energy loss spectra show new peaks as a result of the pressure effect on the energy loss function. From our results, we noticed the effect of pressure within the range (0–60 GPa) on each of the structural, electronic and optical properties, and there is also good agreement between the current results and previous results.
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