Structural Studies of Rare-Earth Doped Phosphate Glasses
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Mat. Res. Soc. Symp. Proc. Vol. 455 © 1997 Materials Research Society
In this work we have investigated the structure of rare-earth doped metaphosphate glasses, R(P0 3 ) 3 with R=La, Pr, Ho, using neutron diffraction and reverse Monte Carlo (RMC) simulations. From RMC simulations we obtain 3-D structural models from which partial correlations, coordination numbers and inter atomic distances can be determined. The aim is to gain further insight in the glass structure, in particular the structure around the rare-earth ions, in order to contribute to the understanding of the relationships between structural modifications, induced by the rare-earth additives, and the luminescent and magnetic properties. EXPERIMENT The samples used in this work were made by standard melt quenching methods and the procedure is described elsewhere [5]. In the experiment the La- and Ho-sample were in powder form while the Pr sample was in the shape of a glass rod. The neutron diffraction experiments were performed at the Liquid and Amorphous materials Diffractometer (SLAD) at the Studsvik Neutron Research Laboratory, Sweden. The incident neutrons had a wavelength of 1.1 A and were detected at 20 angles between 30 and 1350 (corresponding to 0.3 A-l
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