High-frequency dielectric properties of K.sub.1-x./sub.Li.sub.x./sub.TaO.sub.3./sub. ceramics compared to crystals

0573146 - FZÚ 2024 RIV NL eng J - Článek v odborném periodiku
Nuzhnyy, Dmitry - Petzelt, Jan - Bovtun, Viktor - Kempa, Martin - Repček, Dalibor - Tkach, A. - Vilarinho, P. M. - Kamba, Stanislav
High-frequency dielectric properties of K_1-xLi_xTaO₃ ceramics compared to crystals.
Journal of the European Ceramic Society. Roč. 43, č. 12 (2023), s. 5241-5247. ISSN 0955-2219. E-ISSN 1873-619X
Grant CEP: GA ČR(CZ) GA21-06802S; GA MŠMT(CZ) EF16_019/0000760
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: Li-doped KTaO₃ * dielectric spectroscopy * ferroelectrics * phase transition * soft mode
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 5.7, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.jeurceramsoc.2023.04.037

Second harmonic generation (SHG) and high-frequency dielectric properties of Li-doped KTaO3 (K1-xLixTaO3, KLT100x) ceramics, KLT5 and KLT10, are studied in the 15-300 K temperature range. Using the resonant microwave spectroscopy at 5.8 GHz, time-domain THz spectroscopy and far-infrared reflectivity in conjunction with the dielectric properties earlier published in the 100 Hz – 100 MHz frequency range, a broad-band dielectric response of ceramics is obtained and compared with that recently published for KLT4.3 and KLT8 crystals. According to SHG, unlike in crystals, the ferroelectric phase transition temperature in both ceramics appears near 100 K. The dielectric soft mode softening is less pronounced, and the low-frequency permittivity increases less on cooling, when compared with crystals. The relaxational behavior below the microwave range is very similar and the main relaxations follow the same Arrhenius law as in the crystals.
Trvalý link: https://hdl.handle.net/11104/0343611