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High-frequency dielectric properties of K.sub.1-x./sub.Li.sub.x./sub.TaO.sub.3./sub. ceramics compared to crystals
- 1.0573146 - FZÚ 2024 RIV NL eng J - Journal Article
Nuzhnyy, Dmitry - Petzelt, Jan - Bovtun, Viktor - Kempa, Martin - Repček, Dalibor - Tkach, A. - Vilarinho, P. M. - Kamba, Stanislav
High-frequency dielectric properties of K1-xLixTaO3 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
R&D Projects: GA ČR(CZ) GA21-06802S; GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : Li-doped KTaO3 * dielectric spectroscopy * ferroelectrics * phase transition * soft mode
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 5.8, year: 2023
Method of publishing: Limited access
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.
Permanent Link: https://hdl.handle.net/11104/0343611
Number of the records: 1