Table of Contents
Journal of Nuclear Chemistry
Volume 2013, Article ID 940701, 4 pages
http://dx.doi.org/10.1155/2013/940701
Research Article

Characterization of Radium Sulphate

1Nuclear Chemistry, Department of Chemical and Biological Engineering, Chalmers University of Technology, Kemivägen 4, 412 96 Göteborg, Sweden
2Industrial Materials Recycling, Department of Chemical and Biological Engineering, Chalmers University of Technology, Kemivägen 4, 412 96 Göteborg, Sweden
3Department of Chemistry, Swedish University of Agriculture, SLU, Box 7015, 750 07 Uppsala, Sweden

Received 11 January 2013; Accepted 2 April 2013

Academic Editor: Subhash Chandra Tripathi

Copyright © 2013 Hanna Hedström et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper examines the crystal structure of radium sulphate and compares its structure to barium sulphate, strontium sulphate, and lead sulphate. The radium sulphate powder was measured by both powder X-ray diffraction and EXAFS. The unit cell was determined to be orthorhombic, belonging to the Pnma (no. 62) space group with the cell parameters  Å,  Å,  Å, and  Å3. These data support the fact that radium sulphate is isostructural with barium, strontium, and lead sulphate. The bond distances were determined using EXAFS. The mean Ra–O and S–O bond distances were found to be 2.96(2) Å and 1.485(8) Å, respectively, and the Ra–O–S bond angle was . Findings of EXAFS data are quite consistent and support the XRD data. These findings show that it is possible for radium to coprecipitate with barium, strontium, and lead in sulphate media to form a substitutional solid solution.