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) : Gutowsky,H. S. ; Albert,Shmuel

Report Date : 08 FEB 1973

Pagination or Media Count : 25

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 :   (*FLUORIDES, *NUCLEAR MAGNETIC RESONANCE), RELAXATION TIME, TRANSITION TEMPERATURE, ALKALI METAL COMPOUNDS, SALTS

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE