Colossal and frequency stable permittivity of barium titanate nanoceramics derived from mechanical activation and SPS sintering

Tawfik Al-Naboulsi (1, 2) , Madona Boulos (2) , Christophe Tenailleau (1) , Pascal Dufour (1) , Mirvat Zakhour (1, 2) , Sophie Guillemet-Fritsch

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 LCPM - Laboratoire de Chimie Physique des Matériaux

Highly dense barium titanate nanoceramics have been successfully prepared via a mechanical activation synthesis method and Spark Plasma sintering. Attractive electrical properties have been evidenced in these materials: a colossal permittivity, (3.5. 105) and low loss (0.07) at room temperature and 1 kHz, that are stable over a wide frequency range (from 40 Hz to 40 kHz). Surprisingly, the ferroelectric transition is still observed, for the first time to our knowledge, in these colossal permittivity materials.

Mots clés: Barium titanate; ball milling; spark plasma sintering; nanoceramics; dielectric properties

Domaines: Matériaux; Mécanique des matériaux [physics.class-ph]

Tawfik Al-Naboulsi, Madona Boulos, Christophe Tenailleau, Pascal Dufour, Mirvat Zakhour, et al.. Colossal and frequency stable permittivity of barium titanate nanoceramics derived from mechanical activation and SPS sintering. International Journal of Engineering Research & Science, 2015, 1 (7), pp.25-33. ⟨hal-02089346⟩