Open AccessX-Ray Diffraction and Raman Spectroscopic Studies of Glasses and Glass-Ceramics Inside the A2O-MoO3-Nb2O5-P2O5 (A= Li, Na) Systems
Author(s) -
H. Bih,
L. Bih,
M.P.F. Graça,
M. A. Valente,
Brahim Elouadi
Publication year - 2010
Publication title -
eurasian chemico-technological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 9
eISSN - 2522-4867
pISSN - 1562-3920
DOI - 10.18321/ectj46
Subject(s) - raman spectroscopy , crystallization , materials science , analytical chemistry (journal) , scanning electron microscope , differential thermal analysis , crystallography , nuclear chemistry , chemistry , diffraction , physics , organic chemistry , chromatography , optics , composite material
Phosphate glasses in the system (50-x)A 2 O-xMoO 3 -10Nb 2 O 5 -40P 2 O 5 (AMo-40), with x=0; 30 and A=Li or Na were prepared by the melt quenching method. The effect in the crystallization behaviour of the glass due to the introduction of MoO 3 in the glass composition and varying the molar ratio between network modifiers and network formers (M/F) was studied. The prepared glasses were heat-treated in air, at 550, 600 and 650 ºC for 4 hours. The structure, of the obtained samples, was studied by differential thermal analysis (DTA), X-ray powder diffraction (XRD), Raman spectroscopy and the morphology by scanning electron microscopy (SEM). It was found that the replacement of Li 2 O or Na 2 O by MoO 3 reduces the number of the crystallised phases. In the lithium-niobiophosphate glasses the presence of MoO 3 promotes the formation of NbOPO 4 and reduces the formation of ortho- and pyro-phosphate phases. The thermal treatments affect the arrangements of the network structure of the AMo-40-glasses.