Mixed Crystals by Professor Dr. Alexander I. Kitaigorodsky (auth.)

By Professor Dr. Alexander I. Kitaigorodsky (auth.)

The two-word identify of this e-book can in simple terms supply a sign approximately its content material and method of the topic it bargains with. during time, the time period has progressively turn into a little blurred. the reason being effortless to work out: comparable difficulties at the moment are increasingly more often studied by way of various branches of common technological know-how. The time period "mixed crystals" has bought particular connotations in physics, chemistry, biology, and geology. One and an identical time period can now function a reputation for issues that are both no longer relatively an identical or occasionally relatively varied. And this can be accurately what occurred to the 2 phrases within the identify of the e-book. one in every of them, the time period "crystal", for which crystallography had an un­ ambiguous definition, is now hired via biologists to explain the constitution of mobile membranes and through chemists who use it to indicate levels of polymer crystallinity. "Crystal" has therefore develop into a huge time period which can aid describe any good, or simply a condensed country of a substance, if the cast has a suf­ ficient measure of order within the association of its elements. however the e-book is termed "~lixed Crystals". the opposite note in its identify, the adjective "mixed", has additionally constructed numerous meanings. it truly is now idea ap­ plicable to either homogeneous and heterogeneous structures, that's, to crystals composed of other molecules and likewise to solids which are a mix of crys­ tals with varied structures.

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Under constant pressure, the free energy is a function of concentration and temperature. We have considered the fx cross secti on-. But in practi ce it is essential to know another cross section of this surface. 2 should also contain the temperature axis constructed at right angles to the drawing plane. The surface representing the stable states of the system 25 will then look like a groove. Of interest is the behavior of the projection of the point Monto the temperature-concentration plane. 3.

The vertex of the curve (k) is its critical point. A heterophase region can be narrow or can involve the whole concentration range. Crystals of the ~-phase at all concentrations have, of course, a lattice of the same type, differing only by lattice parameters. Hence the decomposition of solid solutions, which occurs when the representative point intersects the curve bka at a certain temperature, consists in the appearance of slightly different crystals ~1 and ~2' Precise experiments proved that the system is really a two-phase system.

Chapter 12 deals in great detail with a large portion of the available experimental data on binary organic systems. There is a vast amount of literature dealing with molecular complexes. Chapter 13 treats the main types of the complexes, yet the principal attention is given to molecular compounds called packing complexes. These interesting compounds have been studied in detail only in recent years. They have a wide practical applicability, so it is important for technologists to know the principles of their construction.

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