ON THE TETRAGONAL FORMS OF KMO4O6

A reexamination of the X-ray diffraction data for the tetragonal form of KMo4O6 prepared by fused salt electrolysis leads to the conclusion that the crystal structure is better described by using space group P4 /mbm and not P (4) over bar as previously reported. However, refinemen t in the new space group does not result in any significant changes in the atomic arrangement. Possible reasons for the significant differen ce between the c lattice parameter of this form of KMo4O6 and that pre pared at high pressures are also discussed. (C) 1995 Academic Press, I nc.