The structural and physical properties of x CuO (30-x) Bi_2O_3-70 B_2O_3; x = 0, 5, 10, 15, 20 & 25 mol % with 2 mol % V_2O_5 glasses prepared by normal melt quench technique have been investigated by means of FT-IR & physical measurement techniques. With the addition of copper oxide (x ≤ 10 mol%), the frequency bands in the higher region shift towards lower wave number, suggest the conversion of BO_3 to BO_4 structural units, which in turn give rise to the formation of Non Bridging Oxygen's (NBOs). For further increase in CuO (i.e. for x ≥ 10 mol %), the frequency bands shift towards higher wave number, indicate the formation of Bridging Oxygen's (BOs). The FTIR analysis reveals that the present glass system is based on the BiO_3 pyramidal, BiO_6 octahedral units and also on BO_3 and BO_4 structural units. The systematic variation in density and molar volume in these glasses indicates the effect of CuO substitution.
展开▼
