Accession Number:
AD0756675
Title:
Pulsed NMR Studies of Fluorine Relaxation in MPF6.
Descriptive Note:
Technical rept.,
Corporate Author:
ILLINOIS UNIV URBANA DEPT OF CHEMISTRY AND CHEMICAL ENGINEERING
Personal Author(s):
Report Date:
1973-02-08
Pagination or Media Count:
25.0
Abstract:
The fluorine spin-lattice relaxation time t1 was studied in polycrystalline Na, K, Rb, and Cs hexafluorophosphates at temperatures between 77 and 476K by pulsed NMR methods. In each case a discontinuity occurs in the temperature dependence, at 276, 275, 210 and 82K, respectively, those for the K and Rb salts corresponding to previously reported phase transitions. The temperature dependence of T1 observed in the low-temperature phase of the NA, K and Rb salts has a minimum and an asymmetric shape. In the high-temperature phase of all four salts, T1 exhibits a broad frequency-independent maximum of 4 to 7 sec which is attributed to relaxation by spin-rotation interactions within the rapidly reorienting PF6- ions. Author Modified Abstract
Descriptors:
Subject Categories:
- Physical Chemistry