Dielectric and piezoelectric properties of hydroxyapatite-BaTiO3 composites

C. R. Bowen, J. Gittings, I. G. Turner, F. Baxter, J. B. Chaudhuri

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49 Citations (Scopus)

Abstract

This letter describes the relationships between the composition and the dielectric and piezoelectric properties of hydroxyapatite-barium titanate composites for polarized bone substitutes. The ac conductivity and permittivity were characterized from 0.1 Hz to 1 MHz, along with measurements of the d 33 piezoelectric charge coefficient. The addition of BaTiO 3 led to an increase in permittivity and ac conductivity of the material. The increase in both properties was attributed to the presence of the high permittivity ferroelectric phase. The d33 and g33 coefficients decreased rapidly as hydroxyapatite was introduced into BaTiO 3 material. Composites below 80% by volume of BaTiO3 exhibited no net piezoelectric effect.
Original languageEnglish
Article number132906
Number of pages1
JournalApplied Physics Letters
Volume89
Issue number13
DOIs
Publication statusPublished - 2006

Keywords

  • Piezoelectricity
  • Dielectric properties
  • Hydroxyapatite
  • Composite materials
  • Barium titanate
  • Ferroelectricity
  • Measurement theory
  • Electric conductivity
  • Permittivity

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