Enhanced ionic conduction in hydroxyapatites

被引：25

作者：

Singh, Brajendra ^{[1
,2
]}

Kumar, Samayendra ^{[3
,4
]}

Basu, Bikramjit ^{[4
]}

Gupta, Rajeev ^{[1
,3
]}

机构：

[1] Indian Inst Technol, Dept Phys, Kanpur 208016, Uttar Pradesh, India

[2] Univ Allahabad, Ctr Mat Sci, Allahabad 211002, Uttar Pradesh, India

[3] Indian Inst Technol, Mat Sci Programme, Kanpur 208016, Uttar Pradesh, India

[4] Indian Inst Technol, Dept Mat Sci & Engn, Kanpur 208016, Uttar Pradesh, India

来源：

MATERIALS LETTERS | 2013年 / 95卷

关键词：

Biomaterials; Electrical Properties; Hydroxyapatite; Activation Energy; UNIVERSAL DIELECTRIC RESPONSE; AMORPHOUS-SEMICONDUCTORS; NETWORKS; BONE;

D O I：

10.1016/j.matlet.2012.12.074

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have carried out temperature dependent conductivity measurements on bioactive single valence ions doped hydroxyapatites (HAp). We have observed the increase in conductivity of HAp due to doping of Ag and K at Ca site at room temperature and high temperatures. At 650 degrees C, conductivity is measured for HAp (sigma similar to 2.8 x 10(-5) Omega(-1) (S) cm(-1)), Ag doped HAp (sigma similar to 3.5 x 10(-3) S cm(-1)) and K doped HAp (sigma similar to 1.1 x 10(-4) S cm(-1)). At room temperature, conductivity is measured for HAp (sigma similar to 8.2 x 10(-7) S cm(-1)), Ag doped HAp (sigma similar to 5.56 x 10(-4) S cm(-1)) and K doped HAp (sigma similar to 1.32 x 10(-6)S cm(-1)). Analysis of the frequency dependent ac conductivity data shows a large change in n (fractional exponent characterizing the power law behavior) with doping. The activation energy of doped HAp samples decreases to 0.11 eV for silver doping and 0.19 eV for potassium doping compared to 0.39 eV for HAp. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：100 / 102

页数：3

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