TY  - CONF
T1  - Dielectric properties of hydroxyapatite based ceramics
A1  - Gittings,J.P.
A1  - Bowen,C.R.
A1  - Turner,I.G.
A1  - Dent,A.C.E.
A1  - Baxter,F.R.
A1  - Chaudhuri,J.B.
Y1  - 2008///
KW  - Bioceramics
KW  - Dielectric
KW  - Hydroxyapatite
KW  - Polarization
KW  - Sintering
SP  - 157
EP  - 160
JF  - 4M2008 - Fourth International Conference on Multi-Material Micro Manufacturing
T2  - 4M2008 - Fourth International Conference on Multi-Material Micro Manufacturing
A2  - Dimov,S.
A2  - Menz,W.
CY  - Scotland
PB  - Whittles Publishing
T3  - 4M Network of Excellence
N2  - This paper studies the ac conductivity and permittivity of hydroxyapatite based ceramics (HA) at temperatures from
room temperature to 1000°C. HA ceramics were prepared either as dense ceramics or in porous form with
interconnected porosity and were sintered in either air or water vapour. Samples were thermally cycled to examine
the influence of surface adsorbed water on conductivity and permittivity. Surface bound water was thought to
contribute to conductivity for both dense and porous materials at temperature below 200°C. At temperatures below
700§C the permittivity and ac conductivity of HA was also influenced by the degree of dehydration and thermal history.
At higher temperatures (700-1000°C), bulk ionic conduction was dominant and activation energies are in the range of
~2eV, indicating that hydroxyl ions are responsible for conductivity.
SN  - 978-1904445-76-0
Y2  - 2008/10/09/
M2  - Cardiff, UK
ER  -