Saturday, 14 November 2015

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

Abstract 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.

Keywords Barium titanate, ball milling, spark plasma sintering, nanoceramics, dielectric properties.

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