Abstract
Sodium borate glass containing Cu2+ ions was codoped with a variety of metallic or nonmetallic cations, and the ligand field around Cu2+ was examined by optical absorption and electron paramagnetic resonance spectroscopies. Glasses of 0.1CuO·5Na2O·95B2O3+2MOx were prepared by a melt quenching method. The observed strengthening of the ligand field (defined as the blueshift of Cu2+-optical absorption band) was in the order: P5+<Si4+=La3+ (No effect)<Al3+=Ti4+=Ga3+=Nb5+<Y3+<Zr4+<Hf4+. We found that metallic cations having high field strength (Z/r) and high ionicity, Zr4+ and Hf4+, induce a large change in the local structure around Cu2+, while cations with high Z/r but low ionicity have almost no effect on the ligand field.
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