GI-MS48-P04 A model description of crystalline state under external influences Boris Kodess (CMD, Materials Science - VNIIMS-ICS&E, Moscow, Russia) Pouline Kodess (Materials Science Dept. - ICS&E, Aurora, CO, United States of America)email: kodess@mail.ru
A method is proposed for describing the change in the ground state of a phase of a crystalline
substance under external influences. This manner of expression takes into account the
multifactorial nature of governing factors which determine phase transitions and influence the
functional characteristics of the materials being created from the substances. The phase space for
crystals is constructed vector interactions) using three basic and enough independent factors and
then associated with the composition of substance. They describe, first, the change in the level of
available potential or the incoming energy to the substance; second, the time characteristics,
included for describing emerging and existing phases; third, the spatial localization of the phase,
respectively.
For a more detailed description of the processes of phase state change under external influences
these factors consistently combine into the factors of the second level, which create subsystems
to describe the origin of space-time patterns, the evolution of the state of the phase, and third, to
describe the phase transitions in substances. Then a subsequent combination of all three
specialized second-level factors in the third-level factors makes it possible to describe the
relationship of changes in composition and structure with functional characteristics that reflect
the generalized information nature of these characteristics; this can be used to describe more
complex behavior, for example, temporal oscillations of all structural parameters in certain
inorganic, usually multi-component substances.
The use of the model in educational practice has shown that the proposed method of description
of a crystal phase state is useful for a more accessible and comprehensive, and also for a wider
explanation of the multifactor nature of characteristics of condensed substances in the crystalline
state. The model also ensures a better transfer of the accumulated knowledge about the specific
features of the crystalline state into the processes of creating and developing new types of
crystals and the technologies for the production and processing of materials, necessary for use in
various spheres of life and industry.
The connection of this model with fundamental physicо-chemical concepts can be useful for
students as a new tool for deeper and successful mastering of crystallography. We noticed [1-3]
that students whose crystallographic interests are related to the functional information properties
of substances based on the key factors of the crystalline state, faster socialize in the modern
information society and more confidently and reliably solve specific problems in the field of
materials science.
References:

1. B.N. Kodess, E.N., Nechaeva (2016) Proceed. Russian Cryst. Congress, Moscow 2016, 300

2. P. Kodess, B. Kodess. .(2011) Acta Cryst A67, C736

3. B.N. Kodess, R.P. Krentzis, D.V. Krotov, F.A. Sidorenko (1999) J. of Materials Education, 21 (1/2), 59-64
Keywords: model crystalline state, factors of phase space, students’ comprehension