Strontium titanate: Synthesis, properties and uses

0521120 - FZÚ 2020 RIV US eng M - Monography Chapter
Petzelt, Jan - Nuzhnyy, Dmitry
Soft polar phonon mode in SrTiO₃ single crystals, ceramics and thin films.
Strontium titanate: Synthesis, properties and uses. New York: Nova Science Publishers, Inc, 2019 - (Tkach, A.; Vilarinho, P.), s. 1-39. ISBN 978-1-53615-437-5
R&D Projects: GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760; AV ČR(CZ) PAN-17-04
Program: Bilaterální spolupráce
Institutional support: RVO:68378271
Keywords : soft mode * infrared and terahertz spectroscopy * Raman and hyper-Raman spectroscopy * dielectric response * effective dielectric response
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)

SrTiO3 (STO) is the best known incipient ferroelectric, in which the polar soft mode (SM) is responsible for the strong temperature dependence of the linear dielectric properties up to the infrared (IR) range, providing an increase in the low-frequency permittivity from ~300 at room temperature up to more than 20,000 at 5 K. In this review, we summarise the polar SM behaviour in STO single crystals, ceramics, nanoceramics, powders, thin films, and superlattice structures. The SM behaviour in single crystals can be directly compared with microscopic models and first-principle studies relevant for describing the bulk phonon properties in infinite crystals. However, the measured effective SM behaviour in all other types of the mentioned samples is influenced by low-permittivity grain-boundary layers, so-called dead layers, which produce the depolarising field. The review summarises the most relevant experiments devoted to the SM behaviour in all these types of STO materials.

Permanent Link: http://hdl.handle.net/11104/0305782