1. School of Materials Science and EngineeringChina University of Mining and TechnologyXuzhou 221116P. R. China
2. Division of Materials ScienceLuleå University of TechnologyLuleå 97187Sweden
3. Faculty of Advanced Technologies and ChemistryDepartment of Advanced Materials and TechnologiesMilitary University of TechnologyKaliskiego 2 Str.00‐908 WarszawaPoland