Focus on
Microstructure,
structural defects, phase composition, structural transformations
induced by phase transitions, especially, polymorphic transitions,
phase transitions during solidification and in condensed matter,
mechanical properties.
Semiconductor compounds AIIBVI, AIIIBVI.
The latest projects- Scintillator materials - tungstates: growth, structure, mechanical properties, structural defects.
Ternary compounds AIIBVI, namely cadmium-zinc-telluride (CZT) of
different compositions: growth and properties, microstructure,
dislocations, inclusions, dendrites
We study layered semiconductors such as gallium selenide, gallium
telluride, and GaSe doped with S, Er, Gd. We consider synthesis and
melt growth conditions, phase composition, crystallographic aspects,
structural defects, optical and mechanical properties of these crystals.
We have developed new technique of fabricating dense ceramics from CdTe
nanopowder. The ceramic specimens show extremely high specific
electrical resistivity on the order of 1010 Ohm˛cm. Their mechanical
hardness is 1450 MPa, which is more that three times higher than the
corresponding value of melt-grown CdTe. The compacted CdTe has rather
high transmission in the wavelength range of 6-25 microns. These properties make
this material interesting for the fabrication of infrared optical
elements and for potential use as ionizing-radiation detectors.
Alkali
halide crystals. Recrystallization and aging of pure and doped alkali halide crystals
(AHC). We have found that recrystallization of the alkali halide
crystals after deformation or reversible polymorphic transition
includes nucleation and growth of twins, with respect to initial single
crystal, at the first stage of grain growth. Using XRD
and texture analysis, we have absolutely reliably detected
decomposition of solid solutions in lightly doped AHC undergone
deformation or phase transition and then held at room temperature. The
effect of low temperature and water vapor on phase composition,
microstructure and mechanical properties of the deformed crystals have
been studied. I suppose that deeper insight into the problem and more
profound understanding of recrystallization processes in these
materials can be provided by studying orientation relationships between
new recrystallized grains and the matrix. Instability of deformation bands in LiF and KCl
crystals has been observed. There is experimental approach to analysis of
scaling as a general feature of the collective phenomena in deformation
processes.