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Initial Rietveld characterisation of biological calcifications

Published online by Cambridge University Press:  10 January 2013

K. D. Rogers
K. D. Rogers*
Affiliation:
Cranfield University, Department of Materials Science and Engineering, Shrivenham, Swindon, Wiltshire, United Kingdom SN6 8LA
*
a)Electronic mail: [email protected]
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Abstract

X-ray diffraction data has been collected from biological calcific mineral associated with human bone, breast tissue, ureteric calculi, heart valve, and aorta. All the materials are shown to have a nominal calcium hydroxyapatite structure and Rietveld analysis has been performed to extract microstructural information. All refinements achieved a final Rwp value of <10%. The lattice parameter ranges are a=9.375(3)(breast)−9.4316(8)(heartvalve), c=6.866(1)(uretericcalculi) −6.899(1)(rib), and crystallite size range from 40 Å (breast) to 99 Å (ureteric calculi). A correlation between crystallite size estimates from this Rietveld analysis and line profile methods is demonstrated. The results are supported by an infrared study and previous data from alternative techniques. Thus, it is demonstrated that the microstructure of these materials may be characterised by application of the Rietveld method.

Type
Research Article
Information
Powder Diffraction , Volume 12 , Issue 3 , September 1997 , pp. 175 - 179
Copyright
Copyright © Cambridge University Press 1997

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