Structure and phase transitions in trigonal Cs3Sb2I9 crystals |
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| Authors: | M. S. Novikova I. P. Makarova M. K. Blomberg B. Sh. Bagautdinov I. P. Aleksandrova |
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| Affiliation: | (1) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 117333, Russia;(2) Department of Physics, University of Helsinki, Helsinki, Finland;(3) Institute of Solid-State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia;(4) Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Russia |
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| Abstract: | The atomic structure of Cs3Sb2I9 single crystals was refined using X-ray diffraction data (sp. gr. P3m1; wR = 1.58% and R = 3.07%). The phase transitions revealed earlier were found to be accompanied by the appearance of superstructural reflections. At T c1 = 86 K, the reflections indicating doubling of the c parameter. At T c2 = 73 K, a first-order phase transition takes place accompanied by “freezing” of the satellites h, k + 1/2, l + 1/2 reflections. In the temperature range from 73 to 78 K, an incommensurate phase providing the satellites h, k + 1/2 + δ, l + 1/2 is formed. |
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