MAGNETIC RESONANCE STUDIES OF LITHIUM VANADIUM BRONZE

Technical Report · Tue Jan 16 04:00:00 EST 1962

OSTI ID:4838678

Gendell, J; Cotts, R M; Sienko, M J

The nuclear magnetic resonance of Li/sup 7/ in Li/sub x/V/sub 2/O/sub 5/ shows no Knight shift, but there is a small diamagnetic shift relative to LiCl solution, amounting to 0.0023 and 0.0058% at 296 and 77 deg K respectively. The spin-lattice relaxation time, T/sub 1/, as measured by pulse experiments, decreases from 0.16 sec at 296 deg K to a minimum of 0.060 sec at 163 deg K and then rises to 0.13 sec at 77 deg K. The free induction decay half-width decreases from 850 mu sec at 296 deg K to 100 mu sec at 77 deg K. The minimum in T/sub 1/ is attributed to back-andforth motion of the Li ions within but normal to the axis of channels in the O framework; the line narrowing, to diffusion along the channel from one unit cell to an adjacent one. EPR studies give Lorentzian- shaped 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 V/sub 2/O/sub 5/ structure are completely ionized to give Li/sup +/ ions and electrons which are almost but not completely localized as V/sup +4/ centers. (auth)

• Research Organization: Cornell Univ., Ithaca, N.Y.
• NSA Number: NSA-16-021123
• OSTI ID: 4838678
• Report Number(s): AFOSR-1959
• Country of Publication: United States
• Language: English

Related Subjects

DECAY
DIAMAGNETISM
DIFFUSION
HALF-LIFE
INDUCTION
IONS
KNIGHT SHIFT
LATTICES
LITHIUM 7
LITHIUM CHLORIDES
LITHIUM COMPOUNDS
MAGNETISM
MEASURED VALUES
NUCLEAR MAGNETIC RESONANCE
OSCILLATIONS
PHYSICS
PULSES
RELAXATION
SOLUTIONS
SPECTRAL SHIFT
SPIN
TEMPERATURE
VANADIUM OXIDES