Title of article :
Synthesis, characterization, structural refinement and optical absorption behavior of PbWO4 powders
Author/Authors :
Cavalcante، نويسنده , , L.S. and Sczancoski، نويسنده , , J.C. and Albarici، نويسنده , , V.C. and Matos، نويسنده , , J.M.E. and Varela، نويسنده , , J.A. and Longo، نويسنده , , E.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Abstract :
The present paper describes the synthesis, characterization, structural refinement and optical absorption behavior of lead tungstate (PbWO4) powders obtained by the complex polymerization method heat treated at different temperatures for 2 h in air atmosphere. PbWO4 powders were characterized by X-ray diffraction (XRD), Rietveld refinement, Fourier transform Raman (FT-Raman) spectroscopy and ultraviolet–visible (UV–vis) absorption spectroscopy measurements. XRD, Rietveld refinement and FT-Raman revealed that PbWO4 powders are free of secondary phases and crystallizes in a tetragonal structure. The UV–vis absorption spectroscopy measurements suggest the presence of intermediary energy levels into the band gap of structurally disordered powders.
Keywords :
Lead , ceramics , crystallization , Crystal symmetry , Optical properties , Order–disorder transition
Journal title :
MATERIALS SCIENCE & ENGINEERING: B
Journal title :
MATERIALS SCIENCE & ENGINEERING: B
