1. Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via G. La Pira 4, Firenze I-50121, Italy
2. Department of Physics, School of Science and Technology, Meiji University, Kanagawa 101-8301, Japan
3. Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth D-95440, Germany
4. Laboratory of Crystallography, Universität Bayreuth, Bayreuth D-95447, Germany
5. Institute for Solid State Chemistry of Ural Branch of Russian Academy of Sciences, 91 Pervomayskaya Str., Yekaterinburg 620219, Russia
6. European Synchrotron Radiation Facility, BP220, Grenoble F-38043, France
7. Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
8. Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou 510640, China