In this project we will use ND to reveal the structure of the ternary MGF glasses proposed above. In ND one can also resolve light elements in a surrounding of a heavy matrix, e.g. Thus, XRD weights more on the heavy elements and in case of the materials in the present project it will therefore highlight the glass network. Indeed, even different isotopes of the same element might have drastically different scattering lengths. The atomic form factor in XRD directly depends on the number of electrons of the atomic species in the glass whereas the ND cross-section varies non-regularly throughout the periodic table. ND and XRD are complementary due to the fact that the contrasts in the two experiments are quite different. We have previously shown the direct relation between the structural expansion, related to the intermediate range order, and the conductivity of oxide-based ion conducting glasses. The latter is particularly important in the studies of ion conducting glasses as it can be related to the size and dimensionality of the conduction pathways in the structure and thus to the macroscopic conductivity. Whereas G(r) can provide information on the short range order (r < 10Ã…), nearest neighbor distances and coordination numbers, S(Q) can provide information on the intermediate range order, r ≈ 10-30 Ã… from the position of the first diffraction peak. The Chalmers students will combine the ND and XRD data to generate more accurate partial radial distribution functions for the MGF glasses and this will provide input data for refined modeling of the structures of the MGF glasses.Īs in the case of XRD, in ND structural information is obtained from the static structure factor S(Q), directly measured in the experiment, and the real space Fourier transform G(r), the pair distribution function. Their research group has pioneered the combined use of ND and RMC simulation techniques to examine the details of the structure of binary glasses. Lars Borjesson and Aleksandar Matic specialize in the diffraction study of amorphous materials.
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