Thermooptical and dielectric studies of a calcium-induced ferroelectric phase in a SrTiO.sub.3./sub. incipient ferroelectric

0510822 - FZÚ 2020 RIV RU eng J - Journal Article
Markovin, P.A. - Trepakov, Vladimír - Guzhva, M.E. - Dejneka, Alexandr - Razdobarin, A.G. - Kvyatkovskii, O.E.
Thermooptical and dielectric studies of a calcium-induced ferroelectric phase in a SrTiO₃ incipient ferroelectric.
Physics of the Solid State. Roč. 60, č. 9 (2018), s. 1793-1806. ISSN 1063-7834. E-ISSN 1090-6460
Institutional support: RVO:68378271
Keywords : thermooptical * dielectric studies * ferroelectric phase
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 0.950, year: 2018
Method of publishing: Limited access
https://doi.org/10.1134/s1063783418090196

We have examined temperature changes of the light refraction, birefringence, dielectric permittivity, and dielectric hysteresis loops in Sr1-xCaxTiO3 single crystals with x = 0.014 (SCT-1.4). The dielectric properties of Sr1-xCaxTiO3 with x = 0.007 (SCT-0.7) have been studied. We have performed ab initio calculations of equilibrium structures and total energies for three low-temperature phases of SrTiO3 and CaTiO3, based on which we have determined an expected symmetry of the ground state of their solid solution and spontaneous polarization directions in a calcium-induced ferroelectric phase in Sr1-xCxTiO3. In SCT-1.4, we have separated a spontaneous contribution to the light refraction, which arises due to the spontaneous electrooptical effect caused by the spontaneous polarization and its fluctuations.
Permanent Link: http://hdl.handle.net/11104/0301200