Evaluation of the Influence of the Substituting Cation on the Structural and Morphological Properties of the New Garnet Sm3−xREExFe5O12 (REE = Dy, Gd and Lu)

Abstract

Rare earth garnets (REE 3 Fe 5 O 12 ) have magnetic-electric and optical properties that can be used in transmitters, microwave and data storage devices. These properties depend mainly on partial or total substitution of the cationic sites, as well as by the synthesis method used. Therefore, in this work was studied the influence of the substituting cation on the structural and morphological properties of new garnets with formula Sm 3−x REE x Fe 5 O 12 with x = 0.0 -1.0; obtained by the solidstate reaction method. Characterization of samples was carried out by XRD, Rieltveld refinement, SEM and Raman spectroscopy. The results showed that the substitution favors system stability and formation of garnets single phase with cubic structure and space group of Ia3d (230) at temperatures lower than reported by other authors. The substitution generated a decrease of the lattice parameters, the crystal size and favored particle formation of the order of micrometers (from 1.3 to 3.6 µm).

Optical and structural properties of the Fe3+-doped Lu3Al5O12:Ce3+ garnet phosphor

“…The precursors were previously calcined at 800 °C for 2 hours to eliminate volatile impurities, them stoichiometric mixtures according to the garnet composition Lu 3−3 y Ce 3 y Al 5− x Fe x O 12 with y = 0.045, and x = 0.00, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40 and 0.45 were ground, pressed into pellets under axial pressure of 2.5 MPa and sintered at 1200 °C for 20 hours. 13 In addition, active carbon was used to provide a reducing atmosphere.…”