Electrical characterization of hydroxyapatite-based bioceramics

被引：154

作者：

Gittings, J. P. ^{[1
]}

Bowen, C. R. ^{[1
]}

Dent, A. C. E. ^{[1
]}

Turner, I. G. ^{[1
]}

Baxter, F. R. ^{[1
,2
]}

Chaudhuri, J. B. ^{[2
]}

机构：

[1] Univ Bath, Dept Mech Engn, Mat Res Ctr, Bath BA2 7AY, Avon, England

[2] Univ Bath, Dept Chem Engn, Bath BA2 7AY, Avon, England

来源：

ACTA BIOMATERIALIA | 2009年 / 5卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

R-C-NETWORKS; CALCIUM-PHOSPHATE; DIELECTRIC-PROPERTIES; CERAMIC HYDROXYAPATITE; PROTON CONDUCTIVITY; COMPOSITES; PROPERTY; BEHAVIOR; VAPOR; AC;

D O I：

10.1016/j.actbio.2008.08.012

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

This paper studies the AC conductivity and permittivity of hydroxyapatite (HA)-based ceramics from 0.1 Hz-1 MHz at temperatures from room temperature to 1000 degrees C. HA-based 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 water desorption on AC conductivity and permittivity. Surface-bound water was thought to contribute to conductivity for both dense and porous materials at temperatures below 200 degrees C. At temperatures below 700 degrees C the permittivity and AC conductivity of HA was also influenced by the degree of dehydration and thermal history. At higher temperatures (700-1000 degrees C), bulk ionic conduction was dominant and activation energies were of the order of similar to 2 cV, indicating that hydroxyl ions are responsible for conductivity. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：743 / 754

页数：12

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