scholarly journals FIELD DEPENDENCE OF SPIN-LATTICE RELAXATION TIMES OF Cr3+

1966 ◽  
Vol 44 (7) ◽  
pp. 1387-1399 ◽  
Author(s):  
N. Rumin
Keyword(s):  
Relaxation Time ◽  
Transition Probability ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Field Frequency ◽  
Effective Spin ◽  
Return To Equilibrium ◽  
Spin Lattice Relaxation Time ◽  
Spin Lattice

Relative changes in the effective, one-phonon, spin-lattice relaxation time with transition, magnitude, and direction of magnetic field, frequency, and temperature have been computed for Cr3+ in K3Co(CN)6, Al2O3, and RbAl(SO4)2∙12H2O from a simplified expression for the transition probability requiring knowledge of only the spin Hamiltonian for the particular salt. A comparison with published experimental data, augmented by measurements obtained as part of the present work, indicates that the changes are usually predicted to better than a factor of two.Calculations show that the pulse saturation, resonance-dispersion, and steady-state saturation techniques should yield the same effective spin-lattice relaxation time for an S > 1/2 spin system, when the return to equilibrium is characterized by a simple exponential.

Relative importance of the T-5 and T-7 terms in spin-lattice relaxation time

1979 ◽  
Vol 40 (12) ◽  
pp. 1179-1184 ◽  
Author(s):  
C. Blanchard ◽  
B. Gaillard ◽  
A. Deville
Keyword(s):  
Relaxation Time ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Relative Importance ◽  
Spin Lattice Relaxation Time ◽  
Spin Lattice

NUCLEAR SPIN-LATTICE RELAXATION TIME IN TIN

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-1215-C6-1216
Author(s):  
H. Ahola ◽  
G.J. Ehnholm ◽  
S.T. Islander ◽  
B. Rantala
Keyword(s):  
Relaxation Time ◽  
Nuclear Spin ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Lattice Relaxation Time ◽  
Spin Lattice ◽  
Nuclear Spin Lattice Relaxation

Pressure dependence of iodine nuclear relaxation in rubidium iodide

1978 ◽  
Vol 56 (10) ◽  
pp. 1386-1389
Author(s):  
Marie D'Iorio ◽  
Robin L. Armstrong
Keyword(s):  
Relaxation Time ◽  
Lattice Relaxation ◽  
Low Pressure ◽  
Lattice Relaxation Time ◽  
Lattice Defects ◽  
Spin Lattice Relaxation ◽  
Polymorphic Phase Transition ◽  
Spin Lattice Relaxation Time ◽  
Spin Lattice ◽  
Pressure Phase

The pressure-induced polymorphic phase transition at about 4 k bar in rubidium iodide was studied using nuclear magnetic resonance. The signature of the structural transition is a loss of echo intensity which presumably is due to an increase in the number of lattice defects as a result of the transition. The ratio of the spin–spin relaxation times of the iodine nuclei in the two phases is in agreement with the ratio predicted by a second moment calculation. The actual experimental values, however, are considerably smaller than the theoretical predictions signifying the migration of lattice defects. Estimates of the iodine spin–lattice relaxation time at atmospheric pressure indicate the necessity to include both an anharmonic Raman contribution and a covalency factor. The change in spin–lattice relaxation time with pressure as measured in the low pressure phase is dominated by the change in the lattice parameter. At the critical pressure the spin–lattice relaxation time decreases by a fractional amount which is approximately equal to the fractional volume change characterizing the transition. The pressure derivative of the spin–lattice relaxation time in the high pressure phase is nearly equal to that in the low pressure phase.

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