The features of the crystal structure of c and 2c TlInS2 polytypes have been studied by single-crystal X-ray diffraction method in the temperature range 180 K–300 K. In the c polytype the appearance of the incommensurate phase with modulation vector was observed at the temperature of 238 K (on cooling). The active phase formation occurred between 213 K and 217 K. The incommensurability parameter δ decreases monotonically to the zero as the temperature approaches 195 K. For the 2c polytype the modulation satellites for both incommensurate and commensurate phases were not observed in the temperature range 180 K–300 K.
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Salnik et al. (2015) studied this question.
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