MAGNETIC RESONANCE STUDIES OF LITHIUM VANADIUM BRONZE
Abstract
The nuclear magnetic resonance of Li-7 in LixV2O5 shows no Knight shift, but there is a small diamagnetic shift relative to LiCl solution, amounting to 0.0023 and 0.0058% at 296 K and 77 K, respectively. The spin-lattice relaxation time, T sub 1, as measured by pulse experiments, decreases from 0.16 sec. at 296 to a minium of 0.060 sec. at 163 and then rises to 0.13 sec. at 77 K. The free induction decay halfwidth decreases from 850 micronsec. at 296 to 100 micronsec. at 77 K. The minimum in T sub 1 is attributed to back-and forth motion of the Li ions within but normal to the axis of channels in the oxygen framework; the line narrowing, to diffusion along the channel from one unit cell to an adjacent one. EPR studies give Lorentzianshaped lines, centered at g = 1.96, of intensity proportional to 1/T. Results are consistent with a model in which Li atoms in a host V2O5 structure are completely ionized to give Li(+) ions and electrons which are almost but not completely localized as V(4+) centers. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 16, 1962
- Accession Number
- AD0275086
Entities
People
- Julien Gendell
- M.j. Sienko
- R.m. Cotts
Organizations
- Cornell University