Polarisation behaviour of calcium phosphate based ceramics

J P Gittings, Christopher R Bowen, Irene G Turner, Frances R Baxter, Julian B Chaudhuri

Research output: Chapter in Book/Report/Conference proceedingChapter

20 Citations (Scopus)

Abstract

This paper studies the effects of porosity, sintering atmosphere and composition on the polarisation behaviour of calcium phosphate (CaP) ceramics. Hydroxyapatite (HA) and atricalcium phosphate (α-TCP) materials were prepared as both dense discs and as porous samples with interconnecting porosity. Materials were sintered in either air or water vapour at 13000C and poled at a variety of temperatures, applied electric fields and time periods to optimise the polarisation properties of the materials. Thermally Stimulated Depolarisation Current (TSDC) measurements were used to investigate the degree of polarisation of the HA and a-TCP ceramics. A high depolarisation current was observed for both the porous HA and α-TCP ceramics. Sintering in water vapour also increased the depolarisation current due to reduced dehydration reactions, which result in a greater concentration of hydroxyl ions.
Original languageEnglish
Title of host publicationAdvanced Materials Forum IV: Materiais 2007
EditorsA Torres Marques, A F Silva, A P M Baptista, C Sá, F J L Alves, L F Malheiros, M Vieira
Place of PublicationZurich
PublisherTrans Tech Publications
Pages91-95
Number of pages5
ISBN (Print)978-0-87849-373-9
Publication statusPublished - 2008
EventAdvanced Materials Forum IV - Selected, peer reviewed papers from the 4th International Materials Symposium Materiais 2007 and 8th Encontro da Sociedade Portuguesa de Materiais - SPM - Porto, Portugal
Duration: 1 Apr 20074 Apr 2007

Conference

ConferenceAdvanced Materials Forum IV - Selected, peer reviewed papers from the 4th International Materials Symposium Materiais 2007 and 8th Encontro da Sociedade Portuguesa de Materiais - SPM
CountryPortugal
CityPorto
Period1/04/074/04/07

Keywords

  • Dehydration reactions
  • Polarisation behaviours
  • Sintering atmospheres
  • Hydroxyl ions
  • Porous samples
  • Degree of polarisation
  • Concentration of
  • Water vapours
  • Applied electric fields
  • Time periods
  • Depolarisation
  • Polarisation

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