Hydroxyapatite-barium titanate piezocomposites with enhanced electrical properties

Mythili Prakasam (1) , Marjorie Albino (1) , Eric Lebraud (1) , Mario Maglione (1) , Catherine Elissalde (1) , Alain Largeteau (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The present work aims to obtain Hydroxyapatite (HA) – Barium Titanate (BT) piezocomposites with improved electrical properties by retaining OH-ion and tuning BT grain size. Dense piezocomposites of HA-BT were obtained using single step Spark Plasma Sintering (SPS). The presence of OH-ions in the sintered piezocomposites of HA-BT was confirmed by high-temperature X-ray diffraction and Fourier transform infrared transmittance. No decomposition/ interaction between HA and BT phases were observed in the complete range of temperature studied. The dielectric and pyroelectric properties were studied as a function of temperature (100 K to 450 K) and frequency (100 Hz to 2 MHz). The influence of the ferroelectric grain size (300 and 500 nm) on the electrical properties of HA-BT has been analyzed. The dielectric permittivity of HA-BT ceramics can be enhanced with appropriate ferroelectric grain size and volume fraction of BT (<80%).

Mots clés: Pyroelectric; Electrical properties; Dielectric; Biocomposites

Domaines: Matériaux

Mythili Prakasam, Marjorie Albino, Eric Lebraud, Mario Maglione, Catherine Elissalde, et al.. Hydroxyapatite-barium titanate piezocomposites with enhanced electrical properties. Journal of the American Ceramic Society, 2017, 100 (6), pp.2621 - 2631. ⟨10.1111/jace.14801⟩. ⟨hal-01539135⟩