Download A Configurational Model of Matter by G. V. Samsonov PDF

Download A Configurational Model of Matter by G. V. Samsonov PDF

By G. V. Samsonov

The e-book we're featuring to American and different English­ talking readers is a overview of the paintings at the electron struc­ ture of parts, alloys, and compounds, which used to be all started again within the fifties. This paintings steadily grew right into a procedure of principles at the electron constitution of condensed subject that's referred to now because the configurational version. This version is predicated at the assumption of the preferential formation of the main strong configurations of the localized va­ lence electrons in condensed topic. The lifestyles of those solid configurations and the trade of electrons with the de­ localized (collective-state) subsystem determines these prop­ erties that are with regards to the electron constitution. The conclu­ sions which are drawn from the purposes of the configura­ tional version are just qualitative yet they clarify particularly truly the character of varied homes of condensed subject, and they're useful within the look for fabrics with particular homes. the yankee version has been corrected and supplemented in lots of minor respects. in addition, the chance used to be taken to revise completely the part at the basics of the configura­ tional version within the gentle of the most recent 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 fully.

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A Configurational Model of Matter

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Extra resources for A Configurational Model of Matter

Sample text

CHAPTER I! Physicochemical Properties of Transition Metals and of Their Alloys and Compounds 3. Crystal structure and Polymorphism The crystal lattice symmetry is one of the most important characteristics of a solid and in many ways is related to the physicochemical properties of the solid. The symmetry in the distribution of atoms in a crystal is responsible for the crystallinity of a solid and distinguishes it from, for example, amorphous materials and liquids. A change in the lattice symmetry is accompanied by changes in such properties as the density, specific heat, conductivity, magnetism, hardness, strength, and plastiCity.

The problem of the influence of alloying on the nature and temperature of polymorphic transitions in the elements is also of importance. The considerable theoretical interest evinced recently in the problem of alloying (in relation to the general problem of the influence of impurities on the electron structure of solids) and the important practical applications (search for elements suitable for the formation of refractory alloys) make it necessary to consider this problem with the aid of the configurational model.

The most important factors which govern their physical and chemical properties are the statistical weight and the stability of the electron configurations. The increase in the statistical weight and stability of the sXpY configurations in the transition from beryllium to carbon is accompanied by an increase in the melting point, formation of special electron configurations, and a reduction in the statistical weight of the delocalized electrons. When the principal quantum number of the sp valence electrons increases, the localization of these electrons becomes weaker, the statistical weight of the stable configurations becomes less, and the fraction of the delocalized electrons increases.

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