Add time:08/29/2019         Source:sciencedirect.com

The alleged formation of La-clusters in silicate glasses has received an overall consensus. However, recent and the current experimental results do not support this hypothesis for the structural role of La2O3 in glasses. Therefore, here we propose a new model for the assignment of the peaks in NMR spectra. All the experimental results here reported could be consistently explained by ascribing to La2O3 a network modifier role. Further, the proposed model could also explain the network modifier role of La2O3 in silicate glass compositions reported in literature where it was originally ascribed to form La-clusters. The La2O3 mitigated the LLPS due to increased entropy from the increasing number of different types of Qn structural units.

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