Mn 1 -x å x Se (M = Ti, V, Fe, Co) solid solutions are prepared by solid-state reactions and high-pressure synthesis (7 GPa, 1600 K). All of the solid solutions have a cubic (NaCl) structure, and their lattice parameter decreases with increasing solute concentration. The magnetic susceptibility of the solid solutions is measured from 77 to 900 K by the Faraday method. Below 130-150 K, the solid solutions undergo antiferromagnetic ordering.
Solid solutions Gd2(1-x)TbxEuxO3, where x = 1 and 2.5 mol%, were obtained in an atmosphere of air and hydrogen by the sol-gel method followed by annealing at 700-1200 °C. It was found by XRD and IR spectroscopy that, during annealing, the solutions undergo chemical and phase transformations of the cubic modification into the monoclinic one and change the degree of crystallinity. Under some annealing conditions, the solid solution contains microinclusions of the Tb7O12:Eu3+ phase, which is not formed in a hydrogen atmosphere or at a high activator concentration of 2.5 mol% at 1200 oC. In accordance with these transformations, a redistribution of the photoluminescence activators Tb3+ and Eu3+ occurs over the centrosymmetric C3i, noncentrosymmetric C2 positions of the crystal lattice, and the surface states of Cs. As a result of these rearrangements, the parameters of the photoluminescence spectra change, which are associated with a change in the ways of transferring the excitation energy of the main radiative transitions of the photoluminescence activators Tb3+ and Eu3+.
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