Thermal and magnetic properties of new scheelite type Cd1−3x□xGd2xMoO4 ceramic materials

The limited scheelite type Cd1−3x□xGd2xMoO4 solid solution, where 0 < x ≤ 0.25 and □ are cationic vacancies have been successfully synthesized by high-temperature annealing of CdMoO4/Gd2(MoO4)3 mixtures composed of 50.00 mol.% and less of Gd2(MoO4)3. The obtained materials as well as CdMoO4 and Gd2(MoO4)3 were characterized by powder XRD, DTA–TG, DSC, and SEM techniques. A phase diagram of the pseudobinary CdMoO4–Gd2(MoO4)3 system was constructed. The eutectic point corresponds to 1350 ± 5 K and ∼70.00 mol.% of Gd2(MoO4)3 in an initial CdMoO4/Gd2(MoO4)3 mixture. With decreasing of Gd3+ amount in the crystal lattice of CdMoO4, a melting point of the Cd1−3x□xGd2xMoO4 solid solution increases from 1351 (x = 0.25) to 1408 K (x = 0). EPR method was used to identify the paramagnetic Gd3+centers in Cd1−3x□xGd2xMoO4 for different values of x parameter as well as to select biphasic samples containing both Cd0.2500□0.2500Gd0.5000MoO4 and Gd2(MoO4)3.