Specific heat and thermal conductivity of BaTiO[sub 3] polycrystalline thin films

Davitadze, S. T.; Kravchun, S. N.; Strukov, B. A.; Goltzman, B. M.; Lemanov, V. V.; Shulman, S. G.
March 2002
Applied Physics Letters;3/4/2002, Vol. 80 Issue 9, p1631
Academic Journal
The results of measurements by the ac heater-probe method of the specific heat and thermal conductivity of polycrystalline BaTiO[sub 3] films with thickness between 1 and 0.1 µm in a temperature range 120-440 K are presented. In the heating and cooling runs, the phase transition anomalies of the thermal properties in the region of each phase transition in the sequence of symmetry change m3m-4mm-mm2-3m have been observed. A temperature hysteresis is observed, which is the signature of the first order phase transitions. As film thickness decreases, anomalies shift to lower temperatures and became smeared.


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