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Piezoelectricity in Poled Hydroxyapatite Ceramics
Author(s) -
Gandhi Abbasi A.,
Wojtas Maciek,
Lang Sidney. B.,
Kholkin Andrei L.,
Tofail Syed A. M.
Publication year - 2014
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.13045
Subject(s) - piezoelectricity , poling , materials science , barium titanate , ceramic , ferroelectricity , pyroelectricity , composite material , electromechanical coupling coefficient , piezoelectric coefficient , mineralogy , optoelectronics , dielectric , chemistry
Direct current electrical poling of textured hydroxyapatite ( HA p) ceramics is reported here to exhibit weak ferroelectricity and pyroelectricity, but a remarkably higher (six orders of magnitude) piezoelectricity. The piezoelectric strain coefficient is an order higher than that of bone and of the same order as that of quartz crystal and uncalcified collagen in tendon. The piezoelectric charge coefficient is an order higher than bone, and three orders higher than that of tendon. Piezoelectric constants of poled HA p ceramics are high enough to have physiological relevance such as in the use of bone grafts for stimulated calcification or in energy harvesting from physiological motions. Piezoelectricity in these ceramics can be tuned by controlling texture, and poling parameters. The density of power that can be harvested from HA p ceramics is currently just one order lower than biocompatible ferroelectric ceramic such as barium titanate.