Heat capacity and thermal expansion study of Ba0.9Bi0.067(Ti1-xZrx)O3 ceramics

Michail Gorev (1) , Vitaly Bondarev (1) , Igor Flerov (1) , Annie Simon (2) , Mario Maglione (2)

1 Kirensky Institute of Physics, Siberian Division
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

For Ba0.9Bi0.067(Ti1-xZrx)O3 (x = 0.04,0.15) ceramics, the heat capacity Cp(T) and the thermal expansion α(T) were measured using an adiabatic calorimeter and an optical–mechanical dilatometer in the temperature range 100–420 K. Both compounds reveal diffuse heat capacity and thermal expansion anomalies: three anomalies in the temperature regions 150–250 K, 250–300 K (α(T) only) and 300–400 K at x = 0.04 and two anomalies in the regions 200–250 K and 250–350 K at x = 0.15. The results obtained are discussed together with the data on the dielectric properties.

Mots clés: Ceramics; Heat capacity; Thermal expansion; Dilatometry; Calorimetry

Domaines: Matériaux

Michail Gorev, Vitaly Bondarev, Igor Flerov, Annie Simon, Mario Maglione. Heat capacity and thermal expansion study of Ba0.9Bi0.067(Ti1-xZrx)O3 ceramics. Journal of Physics: Condensed Matter, 2007, 19 (34), 346237 (8 p.). ⟨10.1088/0953-8984/19/34/346237⟩. ⟨hal-00171998⟩