We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
应变诱导外延Ba<sub>0.6</sub>Sr<sub>0.4</sub>TiO<sub>3</sub>薄膜铁电介电性能的频率依赖特性.
- Authors
张宪贵; 宋建民; 康艳霜; 史孟飞
- Abstract
Phase stability and frequency-dependent ferroelectric and dielectric properties of epitaxial Ba0.6Sr0.4TiO3 thin films under different misfit strains were investigated using a modified Landau-Devonshire phenomenological theory combined with Landau-Khalatnikov equation. The phase diagram analysis indicates that ferroelectric tetragonal (c), orthogonal (aa) and paraelectric phases are stable at room temperature and all phase transitions are of second order. The compressive misfit strain increases out-of-plane remnant polarization (Pr) and coercive field (Ec) in c phase while the tensile misfit strain augments in-plane Pr and Ec in aa phase at an electric field frequency of 0.1 kHz. Moreover, it is found that both polarization and coercive field increase with increasing frequency while the dielectric constant decreases rapidly first and then slowly. The maximum tunability decreases and the corresponding misfit strain gradually approaches zero, which is attributed to the enhancement of phase transition temperature (ΔTc). The further calculation results reveal that the shift of misfit strain, decrease in tunability and ΔTc are 0.017%, 10.6% and 7.3 ℃ respectively in the out-of-plane case, which are comparable to 0.019%, 9.7% and 7.7 ℃ respectively for the in-plane case.
- Subjects
DEVON (England); PHASE transitions; TRANSITION temperature; PHASE diagrams; PERMITTIVITY; DIELECTRIC properties; FERROELECTRIC thin films
- Publication
Journal of South China Normal University (Natural Science Edition) / Huanan Shifan Daxue Xuebao (Ziran Kexue Ban), 2022, Vol 54, Issue 4, p1
- ISSN
1000-5463
- Publication type
Article
- DOI
10.6054/j.jscnun.2022051