Diffusion properties and phase transitions of the metallic glass a-Zr2PdHx

Bowman, Robert C.; Cantrell, J. S.; Attalla, A.; Etter, D.E.; Craft, B.D.; Wagner, John; Johnson, William L.

doi:10.1016/0022-3093(84)90619-7

Cited by 22 publications

(2 citation statements)

References 9 publications

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“…The average interval between diffusion hops, τ , can be calculated from the fitting procedure to be 6.7 × 10 −7 s and the spread in activation energy corresponding to r = 500 is ±0.079 eV. The reason for choosing the temperature of 295 K is that it is known from previous work on the temperature dependence of the relaxation in amorphous Zr 2 Pd-H that T 1ρ is a minimum at ∼300 K when B 1 = 7 G [12]. In the earlier work the minimum value of T 1ρ is 230 µs which compares well with 275 µs in the present work at the same spin-locking field.…”

Section: Comparison With Experimentsmentioning

confidence: 99%

“…In the earlier work [12] attention was drawn to the fact that the dip in the T 1ρ -T experimental curve is not symmetrical and this was explained on the basis of standard relaxation models as a change in the activation energy from 0.21 eV at low temperatures to 0.43 eV at high temperatures. An unusual feature of the data was that this change in activation energy occurred at a temperature near to, but somewhat higher than, the temperature of the minimum.…”

Section: Comparison With Experimentsmentioning

confidence: 99%

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Rotating-frame nuclear magnetic relaxation of spins diffusing on a disordered lattice: a Monte Carlo model

Lü¹,

Zhang²,

Titman³

1997

J. Phys.: Condens. Matter

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The rotating-frame nuclear magnetic relaxation rate of spins diffusing on a disordered lattice has been calculated by Monte Carlo methods. The disorder includes not only variation in the distances between neighbouring spin sites but also variation in the hopping rate associated with each site. The presence of the disorder, particularly the hopping rate disorder, causes changes in the time-dependent spin correlation functions which translate into asymmetry in the characteristic peak in the temperature dependence of the dipolar relaxation rate. The results may be used to deduce the average hopping rate from the relaxation but the effect is not sufficiently marked to enable the distribution of the hopping rates to be evaluated. The distribution, which is a measure of the degree of disorder, is the more interesting feature and it has been possible to show from the calculation that measurements of the relaxation rate as a function of the strength of the radiofrequency spin-locking magnetic field can lead to an evaluation of its width. Some experimental data on an amorphous metal-hydrogen alloy are reported which demonstrate the feasibility of this novel approach to rotating-frame relaxation in disordered materials.

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Section: Comparison With Experimentsmentioning

confidence: 99%

Section: Comparison With Experimentsmentioning

confidence: 99%