Neutron diffraction was used to measure the structure of the phosphate glasses RAl0.30P3.05O9.62, where R denotes Dy or Ho, and RAl0.34P3.20O10.04, where R denotes La or Ce. For each glass, isomorphic structures were assumed and difference function methods were employed to separate, essentially, those correlations involving the rare-earth ion, R3+, from the remainder. The ratio of bridging oxygen, OB, to terminal oxygen, OT, atoms in the PO4 tetrahedra was quantified and in both materials R3+ and Al3+ are found to act as network modifying cations which bind to the OT. The R–OT coordination number is 6.7(1) and 7.5(2) for the Dy/Ho and La/Ce glasses respectively.
|Number of pages||5|
|Journal||Journal of Non-Crystalline Solids|
|Early online date||15 Sep 2004|
|Publication status||Published - 15 Oct 2004|
|Event||10th International Conference on the Physics of Non-Crystalline Solids - Parma, Italy|
Duration: 13 Jul 2003 → 17 Jul 2003