Investigation of the thermal expansion and heat capacity of the CaCu3Ti4O12 ceramics

Michail Gorev (1, 2) , Igor Flerov (1, 2) , Anton V. Kartashev (1) , Sophie Guillemet-Fritsch (3)

1 SB RAS - Siberian Branch of the Russian Academy of Sciences
2 SibFU - Siberian Federal University
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

The thermal expansion of the CaCu3Ti4O12 ceramics has been measured over a wide temperature range 120-1200 K. The high quality of the samples under study has been confirmed by good agreement of the results of measurements of the heat capacity in the range 2-300 K and in the vicinity of the phase transition of magnetic nature at 25 K with the data for the single crystal. No anomalies in the thermal expansion that can be associated with the phase transition at 726-732 K assumed by other investigators have been found. The influence exerted on the thermal expansion by the heat treatment of the sample in a helium atmosphere and in air has been investigated.

Mots clés: CaCu3Ti4O12; Dielectric materials; Heat capacity

Domaines: Matériaux

Michail Gorev, Igor Flerov, Anton V. Kartashev, Sophie Guillemet-Fritsch. Investigation of the thermal expansion and heat capacity of the CaCu3Ti4O12 ceramics. Physics of the Solid State, 2012, vol. 54, pp. 1785-1789. ⟨10.1134/S1063783412090120⟩. ⟨hal-00868428⟩