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    STUDIA PHYSICA - Issue no. 1 / 2012  

Authors:  R. STEFAN, E. CULEA.
  Abstract:   xGd2O3·(100-x)[45ZnO·55B2O3] system was prepared within a range of 0 ≤ x ≤ 20 mol%. XRD and FT-IR were used as tools for investigating the structure of prepared system. The XRD patterns revealed the vitreous nature of the samples for x ≤ 15 mol% and the overlapping of vitreous and crystalline phases for x = 20 mol%. The FT-IR spectra suggest a structure formed from [BO3] and [BO4] units of which proportion is varying depending on the gadolinium content. The Ar value representing the number of [BO4] units/[BO3] units ratio was take into consideration for reveling the deep changes in the structure of investigated glasses with the addition and increasing of gadolinium content. The subunit value of Ar ratio suggests that the number of [BO3] units is higher than the number of [BO4] units in all compositional range. The evolution of Ar value function of gadolinium ions concentration reveals the gradual increase within 0÷10 mol% compositional range of the number of [BO4] units with respect to [BO3] units. For x = 15 mol% the increasing of Ar value is attenuated. These results suggest that Gd2O3 is acting as a modifier of the investigated glass samples within 0÷10mol% compositional range. Over these concentrations its role in the investigated glass structure is changing.

Keyword: borate glasses; gadolinium ions; XRD; FT-IR; Ar value.
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