Open AccessElaboration and structural characterization of phosphate glasses with composition 37.5Na2O-25[(1-x)MgO-xNiO]-37.5P2O5 (0≤x≤1)
Author(s) -
Laila Lamrous,
Redouane Farid,
A. El Jazouli,
S. Krimi,
M. Haddad,
Hassane Oudadesse,
Saı̈d M. Sebti,
M. Couzi
Publication year - 2018
Publication title -
mediterranean journal of chemistry
Language(s) - English
Resource type - Journals
ISSN - 2028-3997
DOI - 10.13171/mjc7618121512aejsk
Subject(s) - chemistry , phosphate glass , raman spectroscopy , phosphate , fourier transform infrared spectroscopy , electron paramagnetic resonance , chemical composition , covalent bond , glass transition , molar volume , quenching (fluorescence) , iron phosphate , chemical bond , crystallography , nickel , nuclear chemistry , chemical engineering , organic chemistry , polymer , nuclear magnetic resonance , physics , quantum mechanics , optics , fluorescence , thermodynamics , engineering
Phosphate glasses, with molar compositions 37.5Na2O-25[(1-x)MgO-xNiO]-37.5P2O5 (0 ≤ x ≤ 1), have been prepared using the conventional melt quenching technique. The free nickel glass is colorless while the glasses containing nickel are yellow. The effect of Ni2+ ions on structural and physico-chemical properties of these glasses has been investigated by XRD, DTA, EPR, Raman, FTIR spectroscopies and by density and chemical durability measurements. Substitution of Ni2+ for Mg2+ strengthens the glass network, as shown by the decrease of the molar volume, the increase of the glass transition temperature, and the improvement of the chemical durability. This behavior is a consequence of the replacement of Mg-O bonds by more covalent Ni-O bonds. The glass structure consists of tri-phosphate (P3O10) 5- and di-phosphate (P2O7) 4- groups, and Mg/NiO6 octahedra, with Mg-O-P and Ni-O-P linkages.