abstract
Recently we have demonstrated that out-of-plane dielectric properties of polycrystalline SrTiO3 (ST) films depend on the strain/stress induced by the substrates due to thermal expansion misfit. Here, we present a complementary infra-red (IR) spectroscopy investigation of the role of Al2O3 and MgO substrates on the lattice dynamics and in-plane dielectric properties of ST thin films also prepared by sol-gel. We verify that ST films deposited on Al2O3 substrates, being under a tensile stress, present the soft mode behaviour similar to that of ST single crystals, deviating just below 150 K. In contrast, ST films deposited on MgO substrates, being under compressive stress, have higher soft mode frequency from 10 to 300 K. It is thus proved that for polycrystalline ST films the intrinsic in-plane relative permittivity may be tuned through an induced stress state.
keywords
INDUCED FERROELECTRICITY; PHASE-TRANSITION; TEMPERATURE; RESONANCE; MODES
subject category
Materials Science; Physics
authors
Okhay, O; Tkach, A; Nuzhnyy, D; Petzelt, J; Vilarinho, PM
our authors
Oleksandr Tkach
Assistant Researcher
Olena Okhay
Post-Doc Fellowship
Paula Maria Lousada Silveirinha Vilarinho
Vice Directoracknowledgements
This work was funded by FEDER funds via Programa Operacional Factores de Competitividade - COMPETE and National funds via FCT (Fundacao para a Ciencia e Tecnologia) within the Project CICECO - FCOMP-01-0124-FEDER-037271 (FCT PEst-C/CTM/LA0011/2013) as well as within FCT independent researcher grant IF/00602/2013 and supported by the Czech Science Foundation (project No. 18-09265S).