1. DES, ISEC, DE2D, Univ Montpellier, Marcoule CEA Marcoule Bagnols‐sur‐Ceze France
2. Centre for Material Forming CEMEF, MINES ParisTechPSL Research UniversityCNRS UMR 7635, CS 10207 Sophia Antipolis Cedex France
3. Laboratory of Inorganic Materials University of Chemistry and Technology Prague Prague Czech Republic
4. Institute of Rock Structure and Mechanics, Czech Academy of Sciences Prague Czech Republic