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IJPAP Vol.44(05) [May 2006] >


Title: Effect of divalent metal oxides on absorption spectra of some sodium borate glasses containing mixed nickel and iron oxides
Authors: Batal, FH El
Fayad, AM
Rahman, SA El
Keywords: Absorption spectra
Sodium borate glasses
Divalent metal oxides
Issue Date: May-2006
Publisher: CSIR
IPC CodeC03C4/12
Abstract: Absorption spectra of nickel and iron ions in some sodium borate glasses containing magnesia, cadmium oxide, zinc oxide, lime, strontium oxide or barium oxide were carried out to study the structure of these glasses and the effect of divalent metal oxides on the glass structure. Nickel usually exists in glass as divalent nickel ions in two different forms, octahedral (NiO6) and tetrahedral (NiO4), while iron usually exists in glass as ferrous and ferric states in two different forms, octahedral and tetrahedral according to the glass composition. The states of the transition metal ions in the glasses depend on several factors such as: (i) the polarizability of the oxygen ligands surrounding the transition metal ion; (ii) the mobility of the alkali ions and their field strengths and (iii) the opportunity of forming network units such as MO4 for some of the divalent metal oxides.
Page(s): 367-374
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.44(05) [May 2006]

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