[en] Research and development activities in W technology are reviewed. Information is included on W metal, refractory W compounds for tool materials, W base alloys, W as an additive to alloys, recovery and processing of W, and chemical properties of W compounds. 302 references

[en] Described are the tungsten physical (crystal structure, nuclear thermodynamic, optical, electrical and magnetic properties) and chemical ( interaction with gases, behaviour in aqueous solutions and in reagent melts, corrosion in liquid metals) properties. Presented are the following regions of tungsten application: for steel alloying, in hard alloys on the tungsten carbide base, in heat-resisting and wear-resisting alloys, in contact and 'heavy' alloys, in electrovacuum and electric lighting technique, the application of tungsten chemical compounds

[en] This book describes the following aspects of scandium: discovery and history, occurrence in nature, geochemistry and mineralogy, chemical, physical and technological properties, fabrication and metallurgy, its biological significance and toxicology, and its uses. (Extensive references for each chapter)

[en] Physico-chemical properties, generation, chemical preparation, and the use of technetium and its compounds are reviewed. It is concluded that technetium is in fact a new metal with prospective benefits in science and engineering. However, at present the relatively high price of technetium is an obstacle to a fast progress in usage

[en] Chemistry data on platinum metals are considered and summarized, a particular attention being given to investigations for the last 10-15 years. The data are presented on platinum metal spread in nature, their alloys physical properties, isotope composition of elements and artificially obtained isotopes, methods of separation and purification, analytical chemistry. The main fields of platinum metal application are enumerated. While considering chemical properties of each of the six elements including ruthenium, the general characteristic is presented of their properties in a free state, binary compound data, thermo-dynamic data, coordination compound chemistry

[en] The gettering quality of sintered, pulverized zirconium silicide for various gases as depending on temperature after a previous heating was investigated by topatron. The results obtained have been compared with those of sintered pulverized zirconium and the gettering alloy Zr84Al16

[en] Research and development activities in W technology are reviewed. Information is included on W metal, WC and related materials, W-base alloys, W recovery and processing, and properties of W compounds. 317 references are included. (U.S.)

[en] Considered are the electron structure of atoms of Zr and Hf, the physical and the chemical properties of these metals and of their compounds. The overwhelming majority of compounds of Zr and Hf are complex. An evaluation of the stability of various complexes of these metals is given. Presented are the major applications of Zr, Hf and of their compounds. Noted is the great import of the considered metals for the atomic energetics (cans of fuel elements, heat exchangers, neutron shields, control rods of reactors). Listed are minerals, ores and deposits of Zr and Hf, and described are processes of ores enrichment. Presented are flowsheets for treating ore concentrates and separating zirconium and hafnium. A description of the techniques for manufacturing metallic Hf and Zr is given

[en] A brief description is given of the uses of zirconium and its alloys as a shielding and structural material in nuclear power reactors, and the Polish zirconium requirements to cover the planned development of domestic nuclear power are estimated. Some other industrial applications of zirconium and its alloys and compounds are also mentioned. Data presented suggest the advisability of initiating zirconium production in Poland. (author)

[en] With the study of structures of more than 100 technetium compounds, a packing saturation principle is proposed based on the cone packing model and the normalized ''van der Waals'' radii, in which the sum of the Solid Angle Factors (SAF) of all coordinating ligands reaches a stable region with an average value 0.97 and a characteristic error of ±0.13 (no more than the SAF of one common ligand). It is found that the steric effect due to geometrical factors is quite important and deserves more attention in the design of technetium compounds with predicted structure