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BY-NC-ND 3.0 license Open Access Published by De Gruyter June 2, 2014

The Structure of Gallium Phosphate Glasses by High-energy X-ray Diffraction

  • U. Hoppe EMAIL logo , D. Ilieva and J. Neuefeindb

X-ray diffraction experiments are used to obtain short-range order information of gallium phosphate glasses of meta- and pyrophosphate compositions. Parameters of the first-neighbor peaks, such as coordination numbers and distances, are obtained. A strong decrease of the Ga-O coordination number from 6.0±0.2 to 4.6±0.2 upon Ga2O3 addition is found, which is accompanied by a shortening of the Ga-O distances. Only GaO6 octahedra exist at the metaphosphate composition. Close to the pyrophosphate composition, the majority of Ga atoms occupies already tetrahedral sites. The Ga-O coordination number behaves equivalent with the ratio MTO = n(OT)/n(Ga), thus, with the number n(OT) of terminal oxygen atoms (OT) in phosphorus-OT bonds which are available for the coordination of each Ga atom. Thus, P-OT-Ga bridges are formed for all OT atoms. The GaOn polyhedra neither share OT atoms nor form Ga-O-Ga bridges. With increasing fraction of GaO4 tetrahedra and decreasing lengths of the phosphate chains the network expands.

Received: 2002-5-8
Published Online: 2014-6-2
Published in Print: 2002-8-1

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