Silicate glasses of the composition (Li2O)x(SiO2)100−x (x= 0, 20, 33.3, and 40) have been prepared and characterized by X‐ray and neutron diffraction experiments using the technique of isotopic substitution. Thus, at each composition, a set of independent diffraction patterns allows the discussion of the short‐range and medium‐range structure. For the short‐range structure, average coordination numbers and atomic‐pair distances are obtained from the pairdistribution functions. For the medium‐range structure, i.e., for atomic‐pair distances >0.5 nm, an increase of the amplitudes of the oscillations in the pair‐distribution function is observed with increases in the Li2O content.

In this paper the results of X-ray diffraction experiments of Ln-Si-Al-O-N (Ln = La, Gd, Yb) glasses are presented. Total structure factors and pair correlation functions allow the determination of the first coordination sphere of Ln atoms. The bond lengths observed correspond to the ionic radii of the Ln-ions surrounded by oxygen and nitrogen atoms. The presence of non-bridging nitrogen is discussed together with results of neutron diffraction, NMR-experiments and XPS-studies of other authors.

A comparative study of the atomic dynamics of a-Li 2 Si 2 O 5 and pure SiO 2 glass was performed using neutron inelastic scattering and applying the isotope substitution technique to suppress the coherent scattering from the network modifying Li atoms. The generalized vibrational density of states G(ω) determined in the full energy range up to 150 meV differs clearly in the high energy range and also at low energies. A strong broadening and a shift to lower energies of the sharp lines in the spectrum of SiO 2 is observed in the spectrum of the modified network glass. A detailed analysis of the measured dynamic structure factor S(Q, ω) is used to determine the change of the SiO 2 network force constants by the network modifier, which again is used to support a specific model of the modification in the Si-O network.

The results of X‐ray and neutron diffraction experiments with (Li2O)x(SiO2)100_x glasses (x = 0, 20, 33.3, and 40) are discussed using the Reverse Monte Carlo method to produce atomic clusters, which are analyzed with respect to the O‐O distribution, the angular correlations within the first and higher coordination spheres, and the bond‐orientational multipole moments. Within Li2O‐containing silicate glasses, each lithium atom is surrounded by a ring of six SiO4 tetrahedra in such a way that four oxygen atoms lie at the joints of a tetragonal cell centered by lithium. Thus, the lithium atoms increase the order of the glass.

Elektrolytisch auf Pt‐Blechen abgeschiedene Braunsteine mit a‐ und γ‐Struktur dienten zur Untersuchung des elektrochemischen Verhaltens von MnOz‐Elektroden, u.a. bez. des Einflusses struktureller Eigenschaften des Dioxids und der Wirkung von Zn‐Ionen im Elektrolyten.