Pulsed NMR Studies of Fluorine Relaxation in MPF6.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 08, 1973
- Accession Number
- AD0756675
Entities
People
- Herbert S. Gutowsky
- Shmuel Albert
Organizations
- University of Illinois Urbana–Champaign