STRUCTURE, ELECTRIC AND MAGNETIC-PROPERTIES OF NEW COMPOUNDS CDYMWO7 (M = CR AND MN)

Two new compounds with the formula of CdYMWO7 (M = Cr, Mn) were prepar ed by solid state reaction. They crystallized with orthorhombic struct ure with the cell parameters of a = 11.7200 Angstrom, b = 7.1779 Angst rom, c = 6.9805 Angstrom (CdYCrWO7), and a = 11.7960 Angstrom, b = 6.1 737 Angstrom, c = 7.6530 Angstrom (CdYMnWO7). These compounds are insu lators with high resistivities at room temperature. The temperature de pendence of the magnetic susceptibility of CdYMWO7 (M = Cr and Mn) sho w Curie-Weiss Law's behaviors from 80 to 300 K. The magnetic moments a t room temperature fit very well with those corresponding to Cr3+ and Mn3+ ions. This suggests that both Cr and Mn ions exist in + 3 oxidati on state in CdYMWO7 compounds. (C) 1998 Elsevier Science Ltd. All righ ts reserved.