1. Bayerisches Geoinstitut University of Bayreuth 95440 Bayreuth Germany
2. Institut Charles Gerhardt Montpellier (UMR CNRS 5253) Université de Montpellier 34095 Montpellier Cedex 5 France
3. Material Physics and Technology at Extreme Conditions Laboratory of Crystallography Universität Bayreuth 95440 Bayreuth Germany
4. Photon Science Deutsches Elektronen-Synchrotron 22607 Hamburg Germany
5. ESRF-The European Synchrotron CS40220 38043 Grenoble Cedex 9 France
6. Department of Earth Science Graduate School of Science Tohoku University Sendai 980-8578 Japan