MOSSBAUER, ELECTRICAL AND MAGNETIC STUDIES OF GLASSES OF THE CAO-B2O3-FE2O3-CACL2 SYSTEM

The purpose of this study was to investigate the effect of the replace ment of oxygen ions by chloride ions on the oxidation states of iron, and the magnetic and electrical properties of calcium berate glasses h aving the formula {60 mol% B2O3 - (30-x) mol% CaO, 10 mol% Fe2O3 x mol % CaCl2} where x = 0, 5, 10, 15 and 20. Mossbauer spectroscopy showed that the ratio of Fe3+/Fe2+ ions in the systems investigated depends o n the extent of replacement of CaO by CaCl2 and the resulting effect o n the structure depends on whether the oxide ion enters into the netwo rk of the glass as a network former or ex, network modifier. The magne tic investigations showed that the magnetic susceptibilities of the sa mples depend mainly on the Fe3+/Fe2+ ratio as function of CaCl2 conten t and the changes in glass sample matrices. The electrical conductivit y values showed an increase with increasing CaCl2 content.