Low-Temperature X-ray Diffraction Studies of [(CH{sub 3}){sub 2}NH{sub 2}]{sub 5}Cd{sub 3}Cl{sub 11} Crystals
- Institute of Solid State and Semiconductor Physics, National Academy of Sciences of Belarus, ul. Brovki 17, Minsk, 220072 (Belarus)
- Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333 (Russian Federation)
[(CH{sub 3}){sub 2}NH{sub 2}]{sub 5}Cd{sub 3}Cl{sub 11} crystals are grown by the method of isothermal evaporation from saturated aqueous solutions containing dimethylamine and cadmium chlorides, [(CH{sub 3})2NH{sub 2}]Cl and CdCl{sub 2.5}H{sub 2}O. The crystal grown are studied by the X-ray diffraction method. It is established that the crystals are orthorhombic with the unit-cell parameters at room temperature a = 18.115 {+-} 0.004 A, b = 11.432 {+-} 0.002 A, and c = 15.821 {+-} 0.003 A. The unit-cell parameters a, b, and c of the [(CH{sub 3}){sub 2}NH{sub 2}]{sub 5}Cd{sub 3}Cl{sub 11} crystals are measured as functions of temperature in the temperature range 100-320 K. The data obtained were used to determine the thermal expansion coefficients along the main crystallographic axes. The temperature curves of the unit-cell parameters and thermal expansion coefficients showed pronounced anomalies in the vicinity of the temperatures T{sub 1} = 120, T{sub 2} = 150, and T{sub 3} = 180 K corresponding to the phase transitions in the [(CH{sub 3}){sub 2}NH{sub 2}]{sub 5}Cd{sub 3}Cl{sub 11} crystals. The crystals are also characterized by a pronounced anisotropy of thermal expansion.
- OSTI ID:
- 20666217
- Journal Information:
- Crystallography Reports, Journal Name: Crystallography Reports Journal Issue: 6 Vol. 49; ISSN CYSTE3; ISSN 1063-7745
- Country of Publication:
- United States
- Language:
- English
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