Temperature dependence of microwave and THz dielectric response in Srn+1TinO3n+1 (n=1-4)
D. Noujni, S. Kamba, A. Pashkin, V. Bovtun, J. Petzelt, A-K. Axelsson,, N. McN Alford, P.L. Wise, I.M. Reaney
TL;DR
This study investigates how the dielectric response of Srn+1TinO3n+1 compounds varies with temperature, revealing softening of polar modes linked to microscopic SrTiO3 inclusions affecting permittivity.
Contribution
It provides new insights into the temperature-dependent dielectric behavior of Srn+1TinO3n+1 and attributes soft mode phenomena to microscopic inclusions of SrTiO3.
Findings
Softening of polar optical modes in Sr4Ti3O10 and Sr5Ti4O13
Increase in microwave permittivity and dielectric loss upon cooling
Soft mode linked to SrTiO3 microscopic inclusions
Abstract
The microwave, near-millimetre and infrared (IR) dielectric response of Srn+1TinO3n+1 (n=1-4) Ruddlesden-Popper homologous series was studied in the temperature range 10 to 300 K. Remarkable softening of the polar optical mode was observed in Sr4Ti3O10 and Sr5Ti4O13 which explains the increase in microwave permittivity and dielectric loss upon cooling. However, both samples have a distinct content of SrTiO3 dispersed between SrO layers. It is proposed therefore that the observed soft mode originates from the SrTiO3 microscopic inclusions.
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Taxonomy
TopicsFerroelectric and Piezoelectric Materials · Microwave Dielectric Ceramics Synthesis · Acoustic Wave Resonator Technologies