OCTAHEDRAL VS TETRAHEDRAL COORDINATION OF THE CO(II) ION IN LAYER COMPOUNDS - COXZN1-XIN2S4(0 LESS-THAN-OR-EQUAL-TO X LESS-THAN-OR-EQUAL-TO 0.46) SOLID-SOLUTION

Large crystals of Co//xZn//1 minus //xIn//2S//4(0. 00 less than equivalent to x less than equivalent to 0. 46) solid solution were grown from the vapor phase by chemical transport modified by the time variation of the temperature profile procedure. Co**2** plus ions were found, by XPS analysis, to occupy tetrahedral as well as octahedral sites of ZnIn//2S//4-type structure. The magnetic properties of Co//0//. //4 //6Zn//0//. //5//4In//2S//4, crystallizing in space group R3m, were explained in terms of the short-range magnetic order arising from the presence of isolated clusters of magnetic ions.