A Configurational Model of Matter (Studies in Soviet by G. V. Samsonov

By G. V. Samsonov

The ebook we're providing to American and different English­ talking readers is a assessment of the paintings at the electron struc­ ture of parts, alloys, and compounds, which was once all started again within the fifties. This paintings steadily grew right into a method 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 sturdy configurations of the localized va­ lence electrons in condensed topic. The life of those sturdy configurations and the trade of electrons with the de­ localized (collective-state) subsystem determines these prop­ erties that are concerning the electron constitution. The conclu­ sions that are drawn from the functions of the configura­ tional version are just qualitative yet they clarify particularly in actual fact the character of varied homes of condensed topic, and they're worthwhile within the look for fabrics with detailed houses. the yank 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 gentle of the newest theoretical advancements. different components of the e-book were shortened to dispose of fabric which isn't of primary importance or has no longer but been de­ veloped sufficiently absolutely.

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Consequently, the compressibility of La, Hf, Pt, and Au is lower than the compressibility of their analogs in the second long period. * In the case of elements belonging to the groups ranging from V to Vllrn, the nonmonotonic variation of the compressibility disappears and is replaced by a regular dependence when elements with higher principal quantum numbers of the valence electrons are considered. This is due to an increase in the statistical weight of the d 5 configurations and the greater importance of these configurations in the general bonding scheme.

With relatively large orbital overlap, there is a large probability of electron transfer so that the electrons at any atom are essentially spin-paired" (p. 69 in [60]). This point of view is supported also by other arguments. Jumps of the localized electrons cannot contribute Significantly to the metallic bonding because a considerable increase in the energy of the whole 24 CHAPTER I. CONFIGURATIONAL MODEL OF SOLIDS system would result from the presence, near a given site, of an electron with spin antiparallel to the spin of the atom located at that site [64].

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. Further increase in the temperature should raise the statistical weight of the d 5 configurations and favor a transition to the bcc modification. However, the high-lying unfilled f shell plays an important role in lanthanum.

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