1. Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181–UCCS–Unité de Catalyse et Chimie du Solide, Lille F-59000, France
2. Centre for Science at Extreme Conditions (CSEC) and School of Chemistry, The University of Edinburgh, EH9 3FD, UK
3. Institut Laue-Langevin, Avenue des Martyrs 71, Grenoble Cedex, 32042, France