Journals →  Tsvetnye Metally →  2015 →  #12 →  Back

RARE METALS, SEMICONDUCTORS
ArticleName Influence of TlCl – TlBr and TlBr – TlI crystal growing modes on structural perfection of crystals
DOI 10.17580/tsm.2015.12.12
ArticleAuthor Lisitskiy I. S., Polyakova G. V., Golovanov V. F., Kuznetsov M. S.
ArticleAuthorData

JSC “Giredmet”, Moscow, Russia:

I. S. Lisitskiy, Head of Laboratory of High-Purity Halide Materials for Optics
G. V. Polyakova, Senior Researcher, e-mail: gradan@mail.ru
V. F. Golovanov, Senior Researcher
M. S. Kuznetsov, Senior Researcher

Abstract

Dependence of structural perfection of thallium halide crystals on their growing conditions was investigated. The crystals were grown using Bridgman-Stockbarger technique. Stable temperatures on the heaters of top and bottom furnace parts during the whole process change the work space temperatures because of the heat exchange alteration between the parts during the diaphragm covering by lowering ampoule and heat removal throw the growing crystal, moving into the lowering temperature area. At the same time, position and shape of the crystallization interface are changed, which leads to the change of growing crystal structure. The blocks, which disordered orientation may reach several degrees, are formed, which leads to reduction of mechanical strength and degradation of optical characteristics of obtained material. X-ray investigations of the structure of crystals, grown in various temperature modes, have shown that mono-block homogeneously polygonized structure may be obtained only during the stabilization of the position of relief crystallization interface. X-ray investigations defined the presence of two parameters – two grids with various cell parameters in the crystals of solid TlBr – TlI solutions. These two parameters are shown independently on the growing conditions and are saved in the crystals during the heating to the temperature of 180 oC, which allows to suppose the connection of this phenomena with modifications of lattice cell of TlI, crystallized from the melt with cubical grid. At the same time, during the cooling to the temperature below 180 оС, TlI has the rhombic modification. TlBr should be a stabilizer of the cubical cell of TlI. However TlI may form the rhombic phase “islands”, fixed as pseudo-cubic.
This work was carried out with the financial support of the Ministry of Education and Science of Russian Federation; the Federal Target Program “Investigations and developments of the priority ways of development of scientific-technical complex of Russia for 2014–2020”, within the project “Development of technology of obtaining of new optical materials for the infrared equipment”; Agreement No. 15.576.21.0054. Unique identifier of the applied scientific investigations (project) is RFMEFI57614X0054.

keywords Thallium halides, crystal growing, thermal conditions, heat exchange, crystallization, structural perfection, two parameters
References

1. Kuznetsov M. S., Zaramenskikh K. S., Lisitskiy I. S. Vliyanie atmosfery vyrashchivaniya na kharakteristiki kristallov TlBr. Chast 1. Spektralnoe propuskanie i svetorasseyanie (Influence of growing conditions on TlBr crystal characteristics. Part 1. Spectral transmission and light-diffusion). Tsvetnye Metally = Non-ferrous metals. 2011. No. 4. pp. 81–84.
2. Zhukova L. V., Korsakov A. S., Korsakova E. A., Chazov A. I. Termodinamicheskoe issledovanie diagramm fazovykh ravnovesiy kristallrasplav v geterogennoy sisteme AgBr – TlI (Thermodynamic investigation of phase equilibrium crystal-melt diagrams in heterogeneous system AgBr – TlI). Rasplavy = Melts. 2010. No. 6. pp. 68–76.
3. Korsakov A. S., Zhukova L. V., Korsakov V. S., Vrublevskiy D. S., Salimgareev D. D. Issledovanie fazovykh ravnovesiy i modelirovanie struktury sistemy AgBr – TlBr0,46I0,54 (Research of phase equillibriums and modeling of the structure of AgBr – TlBr0,46I0,54 system). Tsvetnye Metally = Non-ferrous metals. 2014. No. 8. pp. 50–54.
4. Korsakov A., Zhukova L., Korsakova E., Zharikov E. Structure modeling and growing AgClxBr1–x, Ag1–xTlxBr1–xIx, and Ag1–xTlxClyIzBr1–y–z crystals for infrared fiber optics. Journal of Crystal Growth. 2014. Vol. 386. pp. 94–99.
5. Korsakov A. S., Vrublevskiy D. S., Zhukova L. V., Korsakov V. S., Lvov A. E., Mankov P. A. Modelirovanie i izgotovlenie fotonno-kristallicheskikh IK-svetovodov (2,0–40,0 MKM) (Modeling and manufacturing of photoncrystalline IR-LED (2,0–40,0 μm)). Foton-ekspress = Photon-express. 2013. No. 6, Special issue, Part 1. pp. 132–133.
6. Gazizov I. M., Zaletin V. M., Kukushkin V. M., Kuznetsov M. S., Lisitskiy I. S. Kinetika otklika toka detektora TlBr v pole γ -izlucheniya vysokoy moshchnosti dozy (Kinetics of current response of TlBr detector in the field of γ -irradiation of high dose power). Fizika i tekhnika poluprovodnikov = Physics and Technics of semiconductors. 2012. Vol. 46, No. 3. pp. 405–410.
7. Gazizov I. M., Zaletin V. M., Kukushkin V. M., Kuznetsov M. S., Lisitsky I. S. Kinetics of the current response in TlBr detectors under a high dose rate of γ -ray irradiation. Semiconductors. 2012. Vol. 46, No. 3. pp. 391–396.
8. Plotnichenko V. G., Sokolov V. O., Philippovskiy D. V., Lisitsky I. S., Kouznetsov M. S., Zaramenskikh K. S., Dianov E. M. Near infrared luminescence in TlCl:Bi crystal. Optics letters. 2013. Vol. 38, No. 3. pp. 362–364.
9. Zukova L., Korsakov A., Chazov A., Vrublevsky D., Zhukov V. Photonic crystalline IR fibers for the spectral range of 2–40 μM. Applied Optics. 2012. Vol. 51, No. 13. pp. 2414–2418.
10. Grebneva A. A., Bulatov N. K., Zhukova L. V. Gidrokhimicheskiy sintez tverdykh rastvorov AgClxBr1–x (Hydrochemical synthesis of solid solutions of AgClxBr1–x). Neorganicheskie materialy = Inorganic Materials. 2010. Vol. 46, No. 6. pp. 751–756.
11. Lisitskiy I. S. et al. Kristally galogenidov talliya. Svoystva i vozmozhnost primeneniya (Thallium halide crystals. Properties and application possibility). Tezis doklada XIV Natsionalnoy konferentsii po rostu kristallov (NKRK-2010) (Thesis of a report of XIV National crystal growing conference (NKRK-2010)). Moscow, December 6–10, 2010. Vol. II. p. 275.
12. Russo V. M. et al. Primenenie elektroanalogiy k issledovaniyu temperaturnykh poley pri vyrashchivanii monokristallov (Application of electrical analogies to the investigation of temperature fields during the monocrystal growing). Nauchnye trudy Giredmeta (Scientific proceedings of Giredmet). Moscow : Metallurgiya, 1969. Vol. 25. pp. 15–22.
13. Sviridov V. M. et al. Kontrol formy i polozheniya fronta kristallizatsii pri vyrashchivanii monokristallov metodom Stokbargera (Control of shape and position of crystallization interface during the monocrystal growing by Stockbarger technique). Nauchnye trudy Giredmeta (Scientific proceedings of Giredmet). Moscow : Metallurgiya, 1983. Vol. 118. pp. 25–30.
14. Lisitskiy I. S., Golovanov V. F., Kuznetsov M. S., Polyakova G. V. Makroskopicheskie deffekty monokristallov galogenidov talliya, vyrashchennykh iz rasplava metodom Stokbargera (Macroscopic defects of thallium halide monocrystals, grown from the melt by Stockbarger technique). Tsvetnye Metally = Non-ferrous metals. 2004. No. 2. pp. 81–84.
15. Grigorovich A. N. Talliy i ego promyshlennoe poluchenie (Thallium and its industrial obtaining). Alma-Ata, 1960. 174 p.

Language of full-text russian
Full content Buy
Back