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

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

2002-10-17

arxiv.org/abs/cond-mat/0210367v1

J.Phys.: Condens. Matter, v. 15, p. 4331-4340, 2003

Physics

Condensed Matter

Materials Science

12 pages, 7 figures, 2 tables, 450kb; submitted to J.Phys.:Cond.Matt

Scientific paper

10.1088/0953-8984/15/25/304

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.

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