The #-phase structure of Co,Me 6 has been confirmed by making single-crystal measurements. The atomic parameters show some significant changes when compared with those in/~F%W s, and the interatomic distances in CoTMo 8 are compared with those in other transition-metal phases. The distribution of atoms in the available sites appears to be completely ordered.

The a-phase structure of Co2Mo s has been confirmed by single-crystM measurements. The structure has been refined and the interatomic distances compared with those in CoTMo 6 and three other a-phases. The distribution of atoms in the available sites has been determined: cobalt occupies the 12-fold, molybdenum the 15-fold, and a mixture of Co and Mo the 14-fold co-ordinated positions.

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