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Structure of CaO-Ga/sub 2/O/sub 3/-GeO/sub 2/ glasses: X-ray and molecular dynamics simulation studies.

Padlyak B., Mudry S., Halchak V., Korolyshyn A., Rybicki J, Witkowska A.

Optica Applicata

2000

Vol. 30, nr 4

691-699

The X-ray scattering data for CaO-Ga/sub 2/O/sub 3/-GeO/sub 2/ glasses of stoichiometric compositions similar to that of calcium-gallium-germanium garnet (Ca/sub 3/Ga/sub 2/Ge/sub 3/O/sub 12/) Ca-gallogermanate (Ca/sub 3/Ga/sub 2/Ge/sub 4/O/sub 14/) and Ca/sub 3/Ga/sub 2/O/sub 6/ crystals are presented. Experimental results show the true glass structure of the compounds under investigation. A comparative analysis of the X-ray data for glasses and their crystalline analogies has shown that the glass network consists of gallium and germanium oxygen co-ordinated octahedra and tetrahedra. The results obtained have been compared with the results of preliminary molecular dynamics (MD) calculations of the structure of CaO-Ga/sub 2/O/sub 3/-GeO/sub 2/ glasses. The pair distribution functions (PDFs) obtained from the MD simulation, show satisfactory agreement with the X-ray data The building blocks of the CaO-Ga/sub 2/O/sub 3/-GeO/sub 2/ glass network have been proposed. The structure peculiarities of the glasses and their crystalline analogies are discussed.

Influence of magnetic field on the structure of glasses.

Mudry S., Korolyshyn A., Kulyk Y., Halchak V.

Optica Applicata

2000

Vol. 30, nr 4

735-755

The influence of magnetic field on the structure of amorphous alloys has been studied. It is shown that such influence occurs in both the liquid state before glassing and in the amorphous state during thermal treatment. The structural changes investigated by the X-ray diffraction method in liquid Co-B, Co-Cu, Ni-Pb and Mn-Bi eutectic alloys and Ni/sub 0.64/Hf/sub 0.36/ amorphous alloys are considered.