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The Theory of Crystallization as Viewed from Experiences with Electrolytic Systems

B. Težak ; Laboratory of Physical Chemistry, Faculty of Science, University of Zagreb, and »Ruder Boskovic« Institute, Zagreb, Croatia, Yugoslavia


Puni tekst: engleski pdf 10.744 Kb

str. 157-171

preuzimanja: 185

citiraj


Sažetak

By reviewing older results, especially those of v. Weimarn
and Oden, on the examples of differences between sparingly
soluble sulfates and halides, new approaches to the diagramatical
presentation of the characteristic features of precipitation and
crystalization processes and structures were used. Namely, in order
to enable comparison, various systems were observed under fixed
temperature and pressure in developmental stages according to
their position in the so-called "cube of dilution", and were represented
as specific time-dependenf "precipitation bodies".
It is pointed out that the emergence of the solid phase from
solution is a complex phenomenon where a large number of nonequilibrium
states may interfere with each other in such a way
that already the concentrational parameters of various species in
preembryonation stages, as well as in the methorical layer of
embryos, nuclei, primary particles, and secondary aggregates in
formation, reflect both the direct growth of smaller units, and their
aggregation controlled mainly by stability/instability relationships.
In order to explain the critical steps (the role of "new parts"
and "surfaces of discontinuity" of Gibbs) in the transformation of
the homogeneous solution to the heterogeneous system, schemes
of various parts of chemical potential in ionic interactions, the
"surfaces of discontinuity" in the methorical layer, the boundary
of the growing crystal, and the stability/instability conditions of
the ,emerging embryos, nuclei, or primary particles in solution, are
given.

Ključne riječi

Hrčak ID:

194332

URI

https://hrcak.srce.hr/194332

Datum izdavanja:

20.7.1981.

Posjeta: 405 *