ELECTRON-BEAM FLOATING-ZONE GROWING OF HIGH-PURITY COBALT CRYSTALS

A detailed study of the preparation of high-purity cobalt crystals is presented. The procedure consisted of the hydrogen reduction of high-p urity cobalt chloride, the annealing of the resulting cobalt powder un der chlorine flow, and the growth of cobalt crystals by electron-beam floating zone melting. The residual resistivity ratio of cobalt crysta ls was a maximum of 240. The different chemical and metallurgical proc edures for the preparation of high-purity cobalt crystals have been co mpared and discussed. (C) 1998 Elsevier Science B.V. All rights reserv ed.