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Hydroxyapatite‐barium titanate piezocomposites with enhanced electrical properties
Author(s) -
Prakasam Mythili,
Albino Marjorie,
Lebraud Eric,
Maglione Mario,
Elissalde Catherine,
Largeteau Alain
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14801
Subject(s) - materials science , dielectric , spark plasma sintering , barium titanate , grain size , ceramic , ferroelectricity , analytical chemistry (journal) , pyroelectricity , composite material , fourier transform infrared spectroscopy , mineralogy , chemical engineering , optoelectronics , chemistry , engineering , chromatography
The present work aims to obtain Hydroxyapatite (HA) ‐ Barium Titanate (BT) piezocomposites with improved electrical properties by retaining OH − ions and tuning BT grain size. Dense piezocomposites of HA‐BT were obtained, using single step Spark Plasma Sintering. The presence of OH − ions in the sintered piezocomposites of HA ‐ BT was confirmed by thermal characterization 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 MH z). 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%).