The Bordoni internal friction peak in silver single crystals

Brown, G R; Niblett, Daniel

doi:10.1088/0022-3727/6/13/305

Cited by 5 publications

(3 citation statements)

References 18 publications

(26 reference statements)

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“…These crystals were deformed by compression along the axis of the cylinder in a Monsanto Tensometer at room temperature by giving each of them a resolved shear stress of 20 MPa. The results described here are consistent with those obtained by Brown and Niblett [16] for silver single crystals. In each case the orientation was within three degrees of the appropriate axis.…”

Section: -Experimental Proceduresupporting

confidence: 93%

“…The orientation of each crystal was checked after the deformation by the Laue back-reflection X-ray method. Figure 4, which is an Arrhenius plot of the frequency against the reciprocal of the absolute temperature at which the peak occurs, shows that the results of the present work fit well with the measurements of Brown and Niblett [16]. The specimens were left for three days at room temperature after deformation before the ultrasonic attenuation was measured.…”

Section: -Experimental Proceduresupporting

confidence: 87%

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The bordoni peak in silver single crystals at megahertz frequencies

Zein

Alnaser

1993

Il Nuovo Cimento D

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The dislocation relaxation maximum has been investigated at frequencies of 5, 10 and 30 MHz. The three (very high-purity) silver crystals of crystallographic orientation (111), (110) and (100) which are given a resolved shear stress of 20 MPa were found to produce dislocation relaxation maximum at 107 K in all the three samples. The ma.xhnum shifts to 117K when measurement is carried out at 10 MHz and to 127 K at 30 MHz. The results reveal that the maximum is orientation independent. The activation energy and the attempt frequency were calculated and found to be equal to 0.105 eV and 2.109 Hz, respectively. Meanwhile the larger magnitude of the maximum was found on the (111) crystal and the least was on the (100) crystal. Finally, it was clearly shown that the dislocation relaxation strength decreases as the frequency increases. PACS 62.20 -Mechanics and rheology of solids. PACS 61.70.Le -Slip, creep, internal friction, and other indirect evidence of dislocations. PACS 43.35.Bg -Ultrasonic velocity, dispersion, scattering diffraction, and attenuation in liquids, liquid crystals, suspensions, and emulsion. PACS 62.40 -Anelasticity, internal friction, and mechanical resonances.

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Section: -Experimental Proceduresupporting

confidence: 93%

Section: -Experimental Proceduresupporting

confidence: 87%

The bordoni peak in silver single crystals at megahertz frequencies

Zein

Alnaser

1993

Il Nuovo Cimento D

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“…Full-dimensional QCT computational studies of the dynamics of the H 2 + H 2 system were started long before the quantum ones − and led to the development of a dynamical model for four-center reactions. − The most recent of them were carried out by our group on the ASP PES. In particular, our group studied the dynamics and the kinetics of H 2 + H 2 using both the full dimensionality and the reduced dimensionality trapezoidal model to compare with quantum results. , The mechanisms of the exchange and of the dissociation processes were investigated also for the isotopic variants H 2 + HD and H 2 + D 2 .…”

Section: Introductionmentioning

confidence: 99%

Effect of the Total Angular Momentum on the Dynamics of the H₂ + H₂ System

et al. 2009

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Extended full-dimensional quasiclassical trajectory calculations have been performed for the H(a)H(b) (v(ab) = 10, 11, 12, 13, 14, j(ab) = 0) + H(c)H(d) (v(cd) = 0, j(cd) = 0) collisions at values of the translational energy ranging from threshold to 1.5 eV and values of the total angular momentum quantum number J varying from zero to very large ones. Collision-induced dissociation, four-center exchange reaction, and single exchange process probabilities have been calculated. Full-dimensional classical calculations were found to reproduce well the corresponding (J = 0) quantum results, including the thresholds. In contrast, the agreement of full-dimensional classical calculations with the corresponding both quantum and classical reduced dimensionality ones was found to be poor. The effect of varying J on the efficiency of the various processes has also been investigated. Four-center reactions were found to be favored by low values of J, whereas dissociation processes were found to be favored by higher values of J, as expected from the fact that energy exchange takes place at longer range than mass exchange. To evaluate to what extent the J = 0 full-dimensional calculations represent the unconstrained dynamics of the system, J-shift model classical results were compared with the all-J ones. Product vibrational distributions for both partially dissociative and exchange processes were also found to depend significantly on the value of J.

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