ROLE OF IRON ADDITION ON STRUCTURE AND ELECTRICAL AND MAGNETIC-PROPERTIES OF LITHIUM LEAD BORATE GLASSES

Citation
H. Farouk et al., ROLE OF IRON ADDITION ON STRUCTURE AND ELECTRICAL AND MAGNETIC-PROPERTIES OF LITHIUM LEAD BORATE GLASSES, Materials science & engineering. B, Solid-state materials for advanced technology, 38(3), 1996, pp. 217-221
Citations number
21
Categorie Soggetti
Material Science","Physics, Condensed Matter
ISSN journal
09215107
Volume
38
Issue
3
Year of publication
1996
Pages
217 - 221
Database
ISI
SICI code
0921-5107(1996)38:3<217:ROIAOS>2.0.ZU;2-1
Abstract
The effect of iron oxide addition on the structure and electrical and magnetic properties of lithium lead berate glasses was studied using I R transmission spectra: optical absorption techniques, electrical cond uctivity, magnetic susceptibility measurements and differential therma l analysis (DTA). IR transmission spectra showed that the addition of up to 3 mol.% iron oxide to the samples introduced as modifiers at the expense of Pb ions. When the amount of iron oxide is increased to mor e than 3 mol.%, the iron enters the glass structure as network former with an FeO4 structure. The optical absorption properties of glass sam ples containing different amounts of iron oxide indicated that the oxi dation state and the coordination of the doping ions are octahedral. A t high contents of iron oxide, some of the iron ions exist in a tetrah edral form. The electrical conductivities as a function of temperature for glass samples containing different amounts of iron oxide up to 10 mol.% Fe2O3 have similar behaviours, from which we deduced the activa tion energy for each sample. The investigation of the magnetic suscept ibility as a function of Fe2O3 concentration concluded that, for high amounts of iron ions, the iron ions exist in an octahedral coordinatio n rather then in a tetrahedral coordination. DTA showed that the sampl es containing up to 5 mol.% iron oxide are characterized by one crysta llization temperature, while samples containing 10 mol.% iron oxide ha ve two crystallization temperatures.