Structural Studies of CaO-B 2 O 3 -TiO 2 Glass System by Raman Spectroscopy

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Abstract
Structure of CaO-B 2 O 3 -TiO 2 glass system has been studied by Raman spectroscopy in this work. The influences of TiO 2 content and molar ratio of CaO to B 2 O 3 on the structure of CaO-B 2 O 3 -TiO 2 glasses were examined. Experimental results indicate that TiO 2 exists in the form of [TiO 4 ] or forms B-O-Ti linkage, [BTi 4 O 10 ] –1 structure units, in the system, and produces a certain destructive effects to large borate groups and induces to form some relatively small structure units. The increase of CaO does damages to the B-O-Ti linkage and large borate groups, simultaneously leading to the formation of relatively small units. Thus, both TiO 2 and CaO impair borates network structure and weaken the glass-forming ability of borates in CaO-B 2 O 3 -TiO 2 glass system.

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