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Heat capacity study of relaxors BaTi0.65Zr0.35O3 and BaTi0.60Zr0.40O3

Gorev, Michail and Bondarev, Vitaly and Sciau, Philippe and Savariault, Jean-Michel (2006) Heat capacity study of relaxors BaTi0.65Zr0.35O3 and BaTi0.60Zr0.40O3. Journal of Physics: Condensed Matter, 18 (17). pp. 4407-4416.

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The heat capacity of two relaxors BaTi1[?]xZrxO3 (x = 0.35,0.40) was measured using adiabatic calorimetry in the temperature range 100-360 K. The Cp(T) dependence of both compositions is characterized by the presence of two diffuse anomalies near the Burns temperature Td and the temperature of the maximum in permittivity Tm in the temperature ranges 250-350 K and 120-200 K. The anomalous heat capacity near Td was analysed taking into account the distribution of Zr concentration in nanoregions leading to the distribution of their transition temperatures into the polar phase. Excess heat capacity near Tm was discussed in the framework of the spherical random bond-random field model. The results are compared with the data obtained by the same procedures for PbMg1/3Nb2/3O3 studied experimentally earlier.

Item Type:Article
ID Code:5407
Deposited By:Prof. Alexey Ivanov
Deposited On:06 Feb 2010 11:10
Last Modified:06 Feb 2010 11:53

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