Abstract
The crystal structure of the highest- and second highest-temperature solid phases of choline tetrafluoroborate and iodide was determined by X-ray powder diffraction. The structure in the highest-temperature phase of both salts is NaCl-type cubic (a = 10.16 (2) Å, Z = 4 for tetrafluoroborate; a = 10.08 (2) Å, Z = 4 for iodide). The second highest-lemperature phase of tetrafluoroborate and iodide is CsCl-lype cubic (a = 6.198 (6) Å and Z = 1) and tetragonal (a = 8.706 (2) Å, c = 6.144 (6) Å, and Z = 2), respectively. DSC was carried out for the iodide, where the presence of three solid-solid phase transitions was confirmed. Enthalpy and entropy changes of these transitions were evaluated.
| Original language | English |
|---|---|
| Pages (from-to) | 679-680 |
| Number of pages | 2 |
| Journal | Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences |
| Volume | 52 |
| Issue number | 8-9 |
| Publication status | Published - Aug 1 1997 |
Keywords
- Crystal structure
- Phase transition
- Powder X-ray diffraction
ASJC Scopus subject areas
- Mathematical Physics
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry