Study of the Physical Properties and Electrocaloric Effect in the BaTiO3 Nano- and Microceramics

Anton V. Kartashev (1, 2) , Vitaly Bondarev (1, 3) , Igor Flerov (1, 3) , Michail Gorev (1, 3) , Evgeniy I. Pogorel’tsev (1, 3) , Alexander Vasilievich Shabanov (1) , Maxim Sergeevich Molokeev (1, 3) , Sophie Guillemet (4) , Igor P. Raevskii (5)

1 Kirensky Institute of Physics
2 Astafijev Krasnoyarsk State Pedagogical University
3 SibFU - Siberian Federal University
4 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
5 SFEDU - Southern Federal University [Rostov-on-Don]

The specific heat, thermal expansion, permittivity, and electrocaloric effect in bulk of BaTiO3 (BT) samples in the form of nano- (nBT-500 nm) and micro- (mBT-1200 nm) ceramics fabricated using spark plasma sintering and solid-state plasma techniques have been investigated. The size effect has been reflected, to a great extent, in the suppression of the specific heat and thermal expansion anomalies and in the changes in the temperatures and entropies of phase transitions and permittivity, and a decrease in the maximum intensive electrocaloric effect: ΔTmaxAD = 29 mK (E = 2.0 kV/cm) for nBT and ΔTmaxAD = 70 mK (E = 2.5 kV/cm) for mBT. The conductivity growth at temperatures above 360 K leads to the significant irreversible heating of the samples due to the Joule heat release in the applied electric field, which dominates over the electrocaloric effect.

Mots clés: Microceramics; Nanoceramics; Electrocaloric

Domaines: Matériaux; Matériaux

Anton V. Kartashev, Vitaly Bondarev, Igor Flerov, Michail Gorev, Evgeniy I. Pogorel’tsev, et al.. Study of the Physical Properties and Electrocaloric Effect in the BaTiO3 Nano- and Microceramics. Physics of the Solid State, 2019, 61 (6), pp.1052-1061. ⟨10.1134/S1063783419060088⟩. ⟨hal-02409441⟩