Staff Members - Benha University
NMR Investigation of Cation Diffusion in Some Solids with Antifluorite Structure
Journal De Physique • 1980
Publication Information
Authors
M.A.Mousa, Y.S. Oei and H. Richtering
Keywords
Science
Journal
Journal De Physique
Publisher
Not Available
Volume
C6
Issue
7
Pages
223
publication.type
International
Paper Link
Not Available
Supplementary Materials
Not Available
Abstract
Spin-lattice relaxation rates and nmr linewidths of 7Li and 23Na have been measured up to 800 OC
for Li2S, Li20, Na2S-and for Na20. Relaxation due to cation diffusion is observed with predominant dipole
interactions in Li2S and LizO and quadrupole interactions in Na2S and Na20. Motional narrowing occurs below
300 OC. For Li2S, Li20 and Na2S cation jump frequencies in the regions of intrinsic and of extrinsic disorder are
determined with apparent activation energies of about 1.4 and 0.7 eV for Li2S, 1.3 and 0.55 eV for Li20 and 1.3
and 0.7 eV for Na2S. Ionic conductivities calculated from the nmr data agree with conductivities determined
directly within a factor 3
for Li2S, Li20, Na2S-and for Na20. Relaxation due to cation diffusion is observed with predominant dipole
interactions in Li2S and LizO and quadrupole interactions in Na2S and Na20. Motional narrowing occurs below
300 OC. For Li2S, Li20 and Na2S cation jump frequencies in the regions of intrinsic and of extrinsic disorder are
determined with apparent activation energies of about 1.4 and 0.7 eV for Li2S, 1.3 and 0.55 eV for Li20 and 1.3
and 0.7 eV for Na2S. Ionic conductivities calculated from the nmr data agree with conductivities determined
directly within a factor 3