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BaMoO4 powders processed in domestic microwave-hydrothermal: Synthesis, characterization and photoluminescence at room temperature

2008; Elsevier BV; Volume: 69; Issue: 11 Linguagem: Inglês

10.1016/j.jpcs.2008.06.107

1879-2553

L.S. Cavalcante, J.C. Sczancoski, R.L. Tranquilin, Miryam R. Joya, P.S. Pizani, J.A. Varela, E. Longo,

Microwave Dielectric Ceramics Synthesis

In this paper, BaMoO4 powders were prepared by the coprecipitation method and processed in a domestic microwave-hydrothermal. The obtained powders were characterized by X-ray diffraction (XRD), Fourier transform Raman (FT-Raman) spectroscopy, ultraviolet–visible (UV–vis) absorption spectroscopy and photoluminescence (PL) measurements. The morphology of these powders were investigated by scanning electron microscopy (SEM). SEM micrographs showed that the BaMoO4 powders present a polydisperse particle size distribution. XRD and FT-Raman analyses revealed that the BaMoO4 powders are free of secondary phases and crystallize in a tetragonal structure. UV–vis was employed to determine the optical band gap of this material. PL measurements at room temperature exhibited a maximum emission around 542 nm (green emission) when excited with 488 nm wavelength. This PL behavior was attributed to the existence of intrinsic distortions into the [MoO4] tetrahedron groups in the lattice.