Abstract
The crystal structures of (CH3)3NHC1O4 in three solid phases were studied by X-ray diffraction techniques. X-ray powder patterns taken at ca. 500 and 445 K revealed that the plastic phase (Phase I) attainable above 480 K crystallizes in a CsCl-type cubic structure with a = 5.845 (1) A, Z = 1, V = 199.7 (2) A3, and Dx= 1.327 gcm−3, while Phase II, stable between 480 and 396 K, forms a tetragonal structure with a = 9.912 (4), c = 7.01 (2) A, Z = 4, V = 689 (3) A3, and Dx = 1.54 gcm−3. The room temperature phase (Phase III) was studied by single crystal X-ray diffraction and found to form a monoclinic lattice with space group P21a = 5.749(1), b = 8.670(1), c = 7.5585 (9) A, β = 102.66(1)°, Z = 2, V = 367.6(2) A3, and Dx= 1.441 gcm−3. Thermal measurements, differential thermal analysis and differential scanning calorimetry, were carried out on these solid phases, and the obtained results were compared with those observed for (CH3)3NHBF4.
Original language | English |
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Pages (from-to) | 723-726 |
Number of pages | 4 |
Journal | Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences |
Volume | 49 |
Issue number | 6 |
DOIs | |
Publication status | Published - Jun 1 1994 |
Keywords
- Crystal structure
- Ionic plastic phase
- Thermal measurements
- X-ray diffraction
ASJC Scopus subject areas
- Mathematical Physics
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry