Funct. Mater. 2021; 28 (3): 556-563.


Study of temperature conditions of organic DAST single crystals growth from solution

A.P.Voronov1, V.S.Zadorozhnii1, I.M.Pritula1, I.I.Tavrovskyi2, I.S.Terzin1, R.Galbadrakh3, L.Enkhtor3

1Institute for Single Crystals, STC "Institute for Single Crystals", National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine
2Institute for Scintillation Materials,STC "Institute for Single Crystals", National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine
3Department of Physics, School of Arts and Sciences, National University of Mongolia, 14201 Ikh Surguuliin gudamj1, Sukhbaatar district Ulaanbaatar, Mongolia


Considered are the temperature conditions of the solution growth of organic DAST single crystals by means of an electric contact thermometer or a thermocouple as a temperature regulator. It is shown that in the former case the accuracy of temperature control does not exceed &plusm;0.1°C. The synthesis of the parameters of the temperature controller of a thermostat with a crystallizer as a control object with a delay has been carried out. A microprocessor-based program logic unit has been built, where the thermocouple signal is digitized and programmatically filtered by an exponential moving average filter in order to determine the tendency of the measured value to change and in order to form a regulating effect on the heater. The control accuracy is &plusm;0.01°C. The absence of surface and internal defects in crystals grown without fluctuations in the cooling rate of the solution using a type K thermocouple is shown.

organic single crystal, thermocouple, regulator parameters, exponential filter, control accuracy.
1. H.Y.Hwang et al., J. Mod. Opt., 62, 1447 (2015).
2. S.S.Dhillon et al., J. Phys. D. Appl. Phys., 50, 043001 (2017).
3. M.Jazbinsek, P.Gunter, Organic Electro-optic Crystal Modulators. in: A.Chen, E.Murphy, (Eds.), Broadband Optical Modulators: Science, Technology, and Applications. CRC Press, London (2011).
4. L.R.Dalton, P.A.Sullivan, D.H.Bale, Chem. Rev., 110, 25 (2010).
5. S.H.Lee, M.Jazbinsek, C.P.Hauri, O.P.Kwo, Cryst. Eng. Comm., 18, 7180 (2016).
6. C.Bosshard, P.Gunter, Electro-optic Effects in Organic Molecules and Polymers. in: H.S.Nalwa, S.Miyata (Eds.), Nonlinear Optics of Organic Molecules and Polymers. CRC Press, Boca Raton, FL (1997).
7. S.J.Kwon, C.Hunziker, O.P.Kwon et al., Cryst. Growth Des..9, 2512 (2009).
8. Y.Li, Z.Wu, X.Zhang et al., J. Cryst. Growth, 402, 53 (2014).
9. B.Ruiz, M.Jazbinsek, P.Gunter, Cryst. Growth Des., 8, 4173 (2008).
10. T.G.Petrov, E.B.Treivus, Yu.O.Punin, A.P.Kasatkin, Growth of Crystals from Solutions, Nedra, Peterburg (1983) [in Russian].
11. K.Jagannathan, S.Kalainathan, T.Gnanasekaran et al., Cryst. Growth Des., 7, 859 (2007).
12. P.Laveant, C.Medranoa, B.Ruiz, P.Gunter, Chimia, 57, 349 (2003).
13. A.A.Chernov, E.J.Givargizov, K.S.Bagdasarov et al., Modern Crystallography III: Crystal Growth, Nauka, Moscow (1979) [in Russian].
14. N.Zaitseva, L.Carman, Rapid Growth of KDP-Type Crystals. Prog. Cryst. Growth Charact. Mater., 43, 1 (2001).
15. O.J.M.Smith, Feedback Control Systems, McGraw-Hill Series in Control Systems Engineering, McGraw-Hill, New York (1958).
16. V.D.Than, D.Yu.Berchuk, Time Delay Automatic Control Systems: Robustness, Response Time, Synthesis, Software & Systems, 30, 45 (2017).
17. A.A.Voronov, I.A.Orurk (Eds.), Computer Aided Analysis and Optimal Synthesis of Control Systems, Nauka, Moscow (1984) [in Russian].
18. V.I.Goncharov, Real Interpolation Method in Automatic Control Systems Self-adjustment Problem, TPU Publishing House, Tomsk (1995) [in Russian].

Current number: