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Updated: Dec 16, 2025

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties
Published on: August 15, 2015
Parameterization of Dielectric Functions and Phase Transitions of SrTiO₃ from 26 to 674 K
Tae Jung Kim1, Van Long Le1, Han Gyeol Park1
1Department of Physics, Kyung Hee University Seoul 02447, Republic of Korea.
Abstract:
We present parameters that allow the dielectric function (ε = ε1 + iε2) of perovskite SrTiO₃ (STO) to be calculated for spectral range from 0.74 to 6.42 eV and temperatures from 26 to 674 K. The ε data of STO were reproduced from a previous report. We use the Tauc-Lorentz model to express ε of STO analytically for each temperature. The ε spectra are successfully parameterized with six Tauc-Lorentz components and a pole. To obtain ε data for arbitrary energies and temperatures over the range given above, we interpolated the parameterized results using cubic polynomials. It is well known that STO has phase transitions near 40 and 105 K, which are reflected well in our modeling. Our data allow complex refractive indices to be calculated at any temperature for device design.
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