By G. V. Samsonov
The e-book we're featuring to American and different English conversing readers is a overview of the paintings at the electron struc ture of parts, alloys, and compounds, which was once begun again within the fifties. This paintings steadily grew right into a procedure of rules at the electron constitution of condensed topic that's referred to now because the configurational version. This version relies at the assumption of the preferential formation of the main strong configurations of the localized va lence electrons in condensed subject. The life of those good configurations and the alternate of electrons with the de localized (collective-state) subsystem determines these prop erties that are relating to the electron constitution. The conclu sions which might be drawn from the functions of the configura tional version are just qualitative yet they clarify really in actual fact the character of assorted homes of condensed topic, and they're worthy within the look for fabrics with particular houses. the yankee version has been corrected and supplemented in lots of minor respects. additionally, the chance was once taken to revise completely the part at the basics of the configura tional version within the mild of the newest theoretical advancements. different elements of the e-book were shortened to put off fabric which isn't of basic importance or has now not but been de veloped sufficiently fully.
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Additional resources for A Configurational Model of Matter
16 . 10 (Mohs'scale 9( .. 3700 - 940 410-430 1900 500 trons and transitions of the type encountered in nitrogen can still occur in oxygen. 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.
In the second half-period, the variation of the compressibility should be more complex because an increase in the total statistical weight of the stable d 5 and d iO configurations and a simultaneous fall in the weight of the bonding configurations are observed between the metals of group VITIA and the metals of group Ville. This is favored also by the higher stability of the d iO configurations as compared with the dO states. The compressibility of ruthenium and rhodium decreases somewhat compared with molybdenum and that of osmium and iridium decreases in comparison with tungsten (Fig.
Erefore, the relationships governing the formation of the crystal structures of the transition metals are important from the theoretical and practical points of view. In general, the stability of a crystal structure is governed by its free energy. Under any given set of conditions the most stable is that modification which has the lowest free energy. The difficulties encountered in the calculation of the free energy at T = OaK (this energy is equal to the internal energy except for the contribution of the zero-point vibrations) make theoretical computations impractical.