硼酸塩および珪酸塩ガラス中のクロムの分光特性

抄録

Optical absorption spectra have been obtained on Cr³⁺ in alkali borate, alkali silicate and alkaline earth borate glasses. The assignments for bands ν₁∼ν₅ were made on the basis of octahedrally coordinated Cr³⁺ in the glasses and their band positions were determined. The values of three parameters, namely the crystal field strength, D_q, the Racah B and Racah C parameters, were calculated.
The results indicate that;
(1) D_q value of alkali borate glasses increases with increasing concentration of alkali oxide up to about 15mole% but it changes anomalously in the composition range of 15∼20mole%.
(2) D_q value of alkaline earth borate glasses increases with increasing concentration of alkaline earth oxide.
(3) On the contrary, in alkali silicate glasses the value decreases with increasing alkali oxide content.
(4) As for the effect of kind of ion an increase of D_q value of the glass is in the order Li₂O>Na₂O>K₂O and CaO>SrO>BaO for the same molar concentration of the oxide