Structure of Plastic Crystalline Succinonitrile: High-Resolution in situ Powder Diffraction
The temperature dependent (150-290 K) crystal structure of the low-temperature -phase, and high temperature -phase, of succinonitrile has been determined by high resolution in situ powder diffraction. The -phase has a monoclinic unit cell that contains four gauche molecules and belongs to the P21/a space group. The crystal undergoes a reversible first-order phase transition at 233 K into the high temperature -phase. The lattice parameters increase with temperature and the phase transition leads to an abrupt 6.7 % increase in volume. The -phase crystallizes into a bcc-structure that belongs to the space group. The high temperature phase; however, is a highly disordered plastic crystal at room temperature that contains both gauche and trans molecules. The non-linearity in the overall isotropic temperature-factor indicates other possible phase transitions in the temperature range of 233-250 K
- Research Organization:
- Brookhaven National Laboratory (BNL) National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 980555
- Report Number(s):
- BNL--93473-2010-JA
- Journal Information:
- Zeitschrift fur Anorganische und Allgemeine Chemie, Journal Name: Zeitschrift fur Anorganische und Allgemeine Chemie Vol. 635
- Country of Publication:
- United States
- Language:
- English
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