Further NMR studies of fluoride ion motion in doped β‐PbF2

Autor:	T. Y. Hwang, R. W. Vaughan, I. J. Lowe, K. F. Lau
Rok vydání:	1976
Předmět:	chemistry.chemical_compound chemistry Excited state Doping Spin–lattice relaxation General Physics and Astronomy Motion (geometry) Physical and Theoretical Chemistry Atmospheric temperature range Atomic physics Fluoride Ion Magnetic field
Zdroj:	The Journal of Chemical Physics. 65:912-916
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.433159
Popis:	The fluoride ion motion in β‐PbF2 doped with NaF was studied by measurement of the 19F transverse relaxation time (T2), spin lattice relaxation time (T1), and the spin lattice relaxation time in the rotating frame (T1r). Measurements over the temperature range of −50 to 160°C lead to activation energies for T1, T1r, and T2 of 0.205±0.01, 0.29±0.02, and 0.27±0.01 eV/ion, and a T1r minimum at 56°C yields a correlation time of 0.74 μsec. Pressure dependence of T1 and T2 yields activation volumes of ?0.2 cm3/g‐mole and 1.76±0.05 cm3/g‐mole, respectively. These data along with the measured magnetic field independence of T1 suggest that the measured T1’s are not caused by 19F motion, but by thermally excited carriers.
Databáze:	OpenAIRE
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