Quantitative Analysis of Calcium Compounds by Rietveld Method

Introduction

The Rietveld method (Rietveld refinement) is a crystal structure analysis technique that enables analysis of the crystal structures of both single-component and multi-component samples from their powder X-ray diffraction patterns. Because quantitative analysis is possible without using a calibration curve, various types of analytical software applying the Rietveld method are employed in research and development, and manufacturing processes. Match!3 software (Crystal Impact GbR) is a phase identification program that specifies the components of a sample by comparing the X-ray diffraction pattern of the sample and patterns in a database. Use of Match!3 in combination with the Rietveld analysis program FullProf (Juan Rodríguez-Carvajal, Laboratoire Léon Brillouin) enables crystal structure analysis and quantitative analysis. This article introduces a case of phase identification by Match!3 and crystal structure analysis and quantitative analysis by FullProf using a multi-component sample of a calcium compound prepared by adding calcium carbonate to hydroxyapatite, which is known as the main component of teeth and bones.

September 19, 2018 GMT