Affiliation: | (1) Regional Research Laboratory, Habibganj Naka, 462 026 Bhopal, India;(2) National Institute of Materials Research and Testing (BAM), Unterden Eichen 87, 12205 Berlin, Germany;(3) Institute of Nonmetallic Materials, Technical University of Berlin, Englische Str. 20, D-10587 Berlin, Germany |