Abstract
The state of Fe 3+ ions and Fe 3+ −F − interaction in calcium fluorosilicate glasses xCaF 2·(1- x)CaO·SiO 2) (0 ≤ x ≤ 0.3) containing a small amount of iron were investigated by ESR spectroscopy. Two resonances observed near g = 2.0 and g = 4.3 were assigned to dipole-dipole interacted Fe 3+ ions and Fe 3+ ions in a rhombic crystal field, respectively. The fraction of Fe 3+ ions in a rhombic crystal field decreased and that of dipole-dipole interacted Fe 3+ ions increased with increasing Fe 2O 3 content. It was found that the quantity of dipole-dipole interacted Fe 3+ ions depends on the negative partial charge of fluorine ions and shows a maximum at 10 mol% CaF 2 ( x = 0.2). The maximum is attributed to the largest difference between absolute values of the ionic potentials of ferric and fluorine ions which is caused by the smallest negative partial charge of flourine at 10 mol% CaF 2.
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