By G. V. Samsonov

The publication we're providing to American and different English talking readers is a evaluation of the paintings at the electron struc ture of components, alloys, and compounds, which used to be begun again within the fifties. This paintings steadily grew right into a procedure of principles at the electron constitution of condensed topic that's referred to now because the configurational version. This version is predicated at the assumption of the preferential formation of the main good configurations of the localized va lence electrons in condensed subject. The life of those reliable configurations and the alternate of electrons with the de localized (collective-state) subsystem determines these prop erties that are concerning the electron constitution. The conclu sions which are drawn from the functions of the configura tional version are just qualitative yet they clarify fairly in actual fact the character of assorted homes of condensed subject, and they're important within the look for fabrics with unique houses. the yank version has been corrected and supplemented in lots of minor respects. furthermore, the chance used to be taken to revise completely the part at the basics of the configura tional version within the mild of the most recent theoretical advancements. different elements of the publication were shortened to do away with fabric which isn't of primary importance or has no longer but been de veloped sufficiently fully.

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PHYSICOCHEMICAL PROPERTIES OF TRANSITION METALS mediate configurations responsible for the existence of hcp structures in these metals at low temperatures. When the temperature is raised, the statistical weight of the intermediate states decreases and the corresponding weight of the d 5 increases. This stimulates transitions of these elements to bcc modifications. Their analog, lanthanum, has three modifications, of which the a-modification (with the hcp lattice) is associated with the lower statistical weight of the d5 configuration and the considerable "loosening" of the lattice by the collective-state electrons and by the intermediate configuration spectrum.

The statistical weight of the stable S2pG configurations of the localized valence electrons increases in the elements of group VII. The transition from chlorine to bromine reduces the stability of the s2pG configurations and gives rise to the liquid state under normal conditions. 3 eV). The inert gases, which have stable and practically noninteracting S2p6 configurations, are normally monatomic. The energy stability of these configurations decreases with increasing values of the prinCipal quantum number of the sp "valence" electrons but it is quite high.

Under pressure, these transitions increase the statistical weight of the bonding configurations and the binding forces, which tends to reduce the atomic spacing in titanium. In the case of vanadium and, particularly, chromium, the statistical weight of the d 5 configuration is h~gh even under normal conditions and there is limited scope for increasing it. Therefore, the compressibility decreases rapidly along the Ti - V - Cr series. This applies also to the Zr - Nb - Mo and Hf - Ta - + W series for which the compressibility generally decreases with increasing principal quantum number of the d electrons, which is to be expected because of the increasing stability of the d 5 configurations.