NQR AND PHASE-TRANSITIONS OF TETRAMETHYLAMMONIUM TETRAHALOGENOMERCURATES .2.

Authors
TERAO H OKUDA T YAMADA K ISHIHARA H WEISS A
Citation
H. Terao et al., NQR AND PHASE-TRANSITIONS OF TETRAMETHYLAMMONIUM TETRAHALOGENOMERCURATES .2., Zeitschrift fur Naturforschung. A, A journal of physical sciences, 51(5-6), 1996, pp. 755-760
Citations number
9
Categorie Soggetti
Chemistry Physical",Physics
Journal title
Zeitschrift fur Naturforschung. A, A journal of physical sciences → ACNP
ISSN journal
09320784
Volume
51
Issue
5-6
Year of publication
1996
Pages
755 - 760
Database
ISI
SICI code
0932-0784(1996)51:5-6<755:NAPOTT>2.0.ZU;2-T
Abstract
NQR and DTA revealed phase transitions in [(CH3)(4)N] 2HgBr4 and [(CH3 )(4)N] 2HgI4 at 272 K and 264 K, respectively. The NQR resonance lines faded out with increasing temperature. From preliminary measurements of Br-81 NQR spin-lattice relaxation times and Hg-199 NMR a reorientat ional motion of HgBr4- ions around one of their pseudo C-3 axes in the room temperature phase of [(CH3)(4)N] 2HgBr4 is suggested.