Specific heat and heat conductivity of the BaTiO3 polycrystalline films with the thickness in the range 20 - 1100 nm

Thermal properties - specific heat and heat conductivity coefficient - of polycrystalline BaTiO3 films on massive substrates were studied as a function of the temperature and the film thickness by ac-hot probe method. The anomalies of specific heat with decreasing of the film thickness from 1100 to...

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Bibliographic Details
Published in:arXiv.org 2002-10
Main Authors: Strukov, B A, Davitadze, S T, Kravchun, S N, Taraskin, S A, Goltzman, B M, Lemanov, V V, Shulman, S G
Format: Article
Language:English
Subjects:
Anomalies
Barium titanates
Critical temperature
Ferroelectric materials
Ferroelectricity
Film thickness
Heat conductivity
Phase transitions
Polycrystals
Specific heat
Substrates
Thermal conductivity
Thermodynamic properties
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Summary:Thermal properties - specific heat and heat conductivity coefficient - of polycrystalline BaTiO3 films on massive substrates were studied as a function of the temperature and the film thickness by ac-hot probe method. The anomalies of specific heat with decreasing of the film thickness from 1100 to 20 nm revealed the reducing of critical temperature (Tc) and excess entropy of the ferroelectric phase transition, which becomes diffused. The critical thickness of the film at which Tc = 0 estimated as 2.5 nm.
ISSN:2331-8422
DOI:10.48550/arxiv.0210367