Abstract
The structures of (MgO) x (P 2O 5) 100− x glasses, with x=40, 50, 60, have been studied by neutron diffraction. For all glasses the Mg–O coordination number N Mg–O is around 6. Although no abrupt change in N Mg–O around the metaphosphate composition ( x=50) was observed, the mean value and distribution of Mg–O distances changed with increases in the MgO content from 50 to 60 mol% and 40 to 50 mol%, respectively. The quasi-periodicity of the intermediate-range order contracts with an increase in MgO content from 50 to 60 mol%. These changes may represent the structural origin of the phosphate glass anomaly.
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