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Impedance Spectroscopy and Structural Studies on Silver Doped Hydroxyapatite

Published online by Cambridge University Press:  31 January 2011

Brajendra Singh ,
Samayendra Kumar ,
Bikramjit Basu  and
Rajeev Gupta
Brajendra Singh
Affiliation:
brajendr@gmail.com, IIT Kanpur, Physics, Kanpur, India
Samayendra Kumar
Affiliation:
samayend@iitk.ac.in, IIT Kanpur, Materials Science Programme, Kanpur, U.P., India
Bikramjit Basu
Affiliation:
bikram@iitk.ac.in, IIT Kanpur, Metallurgical and Materials Engineering, Kanpur, U.P., India
Rajeev Gupta
Affiliation:
guptaraj@iitk.ac.in, IIT Kanpur, Physics, Kanpur, India
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Abstract

We report the structural transformation and the transport studies of Silver doped hydroxyapatites Ca10-xAgx(PO4)6(OH)2 (0.0 ≤ x ≤ 1.5). A dramatic increase in the conductivity by two orders of magnitude for hydroxyapatite in presence of silver ions is recorded using impedance spectroscopy measurements in the temperature range of 450°C to 650°C. The characteristic surface plasmon resonance effect is used to explore the presence of silver nano-particles, and Ag+ ions in hydroxyapatite using optical absorption measurements. The activation energy has been found to be 0.07 eV in silver doped composition in comparison to 0.39 eV for the parent hydroxyapatite. The sintering temperature dependence and compositional variation on the structural transformations from hydroxyapatite into tricalcium phosphate phases have been explored using Raman Spectroscopy and X-ray diffraction techniques.

Keywords

ionic conductorRaman spectroscopystructural
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1239: Symposium VV – Micro- and Nanoscale Processing of Biomaterials , 2009 , 1239-VV07-18
Copyright
Copyright © Materials Research Society 2010

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