A study of the valence state of the titanium atoms in nonstoichiometric carbides from the X-ray emission spectra and the results of an MO LCAO calculation

Journal of Structural Chemistry -     

Electronic structure of Nb x Ta1−x C alloys

Institute of the Chemistry of Solids, Ural Branch, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 35, No. 1, pp. 130–134, January–February, 1994.     

Magnetic Properties of Ti3O5 with Chromium Additions

Magnetic susceptibility measurements were used to study solid solutions Ti_3?xCr_xO₅ (0 ? × ? 0.17). Contributions to magnetic susceptibility for the α-phase were defined by the statistical analysis of the experimental data. A conclusion was made on the varing character of exchange interactions in α-Ti_3?xCr_xO₅ with increasing Cr content. In the present work, the information given indicates that Cr stabilizes the high-temperature α-Ti₃O₅ and decreases the temperature of semiconductor-metal phase transition. Magnetic properties of low-temperature α-Ti₃O₅ phase with chromium addition are shown to be explained by the existence of exchange-coupled pairs Ti³⁺? Cr³⁺.     

Processing of mineral and technogeneous raw materials by carbothermal reduction

Current studies dealing with the preparation of promising materials (most of all, ceramics) by carbothermal reduction (CR) of mineral and technogeneous raw materials is surveyed. Attention is concentrated on the mechanisms and kinetics of chemical reactions occurring during the CR process and on the effects of varying some factors during the reduction (temperature, duration of annealing, composition of the gas phase, ratio of the components, density of the blend,etc.) on the compositions and properties of the final products. Ways of optimizing particular technological schemes for the production of new materials by the CR method are discussed. Deceased. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 233–245, February, 1997.     

Change in the Lattice Configuration of Nanothin Space-Dissipative Structures Formed in an Amorphous Film

Nanothin space-dissipative structures (SDSs) of hexagonal selenium formed in an amorphous film are investigated by transmission electron microscopy. It is established that the nanothin SDS of hexagonal selenium with a linear fan-shaped system of flexural contours in the electron-microscopy image is initial for the formation of the nanothin SDS of hexagonal selenium with a nonlinear fan-shaped system of flexural contours in the electron-microscopy image. It is shown that the formation of the nanothin SDS of hexagonal selenium with a nonlinear fan-shaped system of flexural contours in the electron-microscope image results in a change in the geometry of the nanothin-SDS lattice from Euclidean to Riemannian.