Solid-state synthesis and characterization of new cadmium and rare-earth metal molybdato-tungstates Cd0.25RE0.50(MoO4)0.25(WO4)0.75 (RE= Pr, Nd, Sm–Dy)

New cadmium and rare-earth double molybdato-tungstates Cd 0.25 RE 0.50 (MoO 4 ) 0.25 (WO 4 ) 0.75 (RE=Pr, Nd, Sm-Dy) were prepared by the solid-state reaction technique from CdMo0 4 and adequate RE 2 (WO 4 ) 3 . The obtained compounds crystallized in the scheelite-type structure and showed solubility in CdMo0 4 forming Cd x Gd 2-2x (MoO 4 ) x (WO 4 ) 3- 3x solid solutions for 0,50<x<1.00. All the obtained phases were characterized by XRD, DTA-TG, IR and EPR methods. The EPR measurements of gadolinium containing samples confirmed that Gd 3+ ions were located at octahedral positions. With the increasing gadolinium content the exchange and dipole-dipole interactions led to a totally antiferromagnetic type of interaction in the Gd 3+ chains network.