The development of the thermophysical foundation for design
and production of new materials is one of the main goals of the Institute's
activity. We focused our attention on the following investigations:
high-rate, reliable, and controllable processes of film
deposition, powder production, and plasmachemical synthesis in supersonic gas
flows, as well as laser ablation;
equilibrium and metastable diagrams for crystal-forming
thermodynamics and kinetics of phase transitions and
chemical reactions in homogeneous and heterogeneous materials in the condensed
Heat and mass transfer of the process in crystal-growing
setups was studied by using the methods of physical and mathematical modeling.
Recently we researched how gas-phase processes in the gas
mixture, which were activated by electron-beam plasma, affect the
characteristics of the film deposit. It was established that gas-phase
condensation is crucial for film growth.
We studied the chemical and physical processes during the
multicomponent film deposition by laser ablation. The following laser-induced
processes were investigated: the kinetics of particles scattering after
laser-induced evaporation into a buffer gas, gaseous reactions in a laser torch
and conditions for cluster formation, the dynamics of torch-substrate
interaction and the formation of the crystal structure in a film. We revealed
the conditions of obtaining epitaxial growth of a multicomponent
high-temperature superconductor film with a perfect crystal structure.
The complex physical modeling of hydrodynamics and convection
heat transfer was performed using the methods of Chokhralski and Stepanoff, the
method of horizontally-directed crystallization, etc. We investigated regimes of
thermal gravitation-capillary convection both experimentally, and by computer
simulation. The mixed and forced isothermal convection was considered by
Chokhralski's method for models with different scales, boundary conditions and
We created completely new methods for studying physical
characteristics and phase transitions in melts and solids (the vibration method
and the method of penetrating radiation).
The equilibrium and metastable phase diagrams of different
oxide, oxide-salt, semiconductor, and metallic systems used for the growth of
crystals which are applicable in different technologies, were studied in detail.
For example, those used in laser technology (rear-earth aluminum and gallium
garnets), crystals for nonlinear optics (potassium-titanyl-phosphate, barium
borate, lithium triborate, cesium triborate, cesium-lithium triborate),
semiconductor crystals (cadmium-mercury-tellurium, germanium, silicon, lithium
atimonide), and crystals of a new generation.
These complex investigations allowed us to propose new
methods and to improve the existing technologies for the production of
monocrystals and films, as well as to improve their characteristics.
Monocrystal areas with epitaxial superconductive film of CdBaCuO with a
thickness of 300 nm deposited on a sapphire substrate (a high-resolution
electronic microscope image). Insertion - the diagram of the low-angle
boundary by Burgers.
Setup for the production of film superconductors.
|Flow pattern in the
mode of laminar thermal gravitational-capillary convection.
||The phase diagram of
the system Li2O- B2O3. It was revealed that the content of crystallizing
phases in this system depends on the thermal and time conditions of the
experiment, that is, this system has a «memory». Liquidus curves for
substances with incongruent melting, stretch into the metastable zone (both
higher or lower than the temperature reaction). It was established that
lithium pentaborate and lithium triborate, being substances with incongruent
melting, can have a congruent melting point.
Бердников В.С., Борисов В.Л.,
Марков В.А., Панченко В.И.
моделирование микроскопических процессов
переноса в расплаве при выращивании
монокристаллов методом вытягивания //
Гидродинамика и теплообмен в технологии
получения материалов. М. Наука, 1990. С.68-88.
Хайрулин Р.А., Станкус С.В.
равновесие в расплавах индий-алюминий // Ж. физ.
химии. 1996. Т.70. №7. С.1230-1232.
Berdnikov V.S., Borisov V.L., Markov V.A., Panchenko
Simulation of the hydrodynamics of melt in pulling crystals with a conical
front and anmilav cross section // Heat Transfer-Sov. Res. 1989. V. 21, no.6.P.828-845.
Kaplun A.B., Meshalkin A.B.
metastablephase equilibrium in system Bi2O3-GeO2 // J.
Crystal Growth. 1996. V. 167, issue 1-2. P.171-175.
Khairulin R.A., Stankus S.V.
The study of
two-melt phase separation in the Bi-Zn system by the gamma attenuation technique // J.
Alloys and Compounds, 1996, Vol.234, P. 260-263.
Laser deposition of HTSC
films: expansion of laser plazma, deposition of particles, formation of crystal structure
and superconducting properties of films // Appl. Superconductivity. 1993. V.1, no. 3-6.
R.G.Sharafutdinov, A.V.Skrynnikov, A.V.Parakhnevich
deposition of a-Si:H films using flow plasma-chemical method with electron beam
activations. // J. Appl. Phys., 1996. v.79, no.9, P..7274-7277.