Funct. Mater. 2021; 28 (3): 556-563.
Study of temperature conditions of organic DAST single crystals growth from solution
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.
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