The radiation effects of very heavy ions on the viscosity of a simple glass

A physical description of fission product behavior fuels for advanced power reactors.

“…5.12 indicate that the theory predicts the release of 85 Kr during the HI-1 test in a flowing steam atmosphere reasonably well. [69,70,71].…”

“…A drastic decrease in the viscosity of a simple glass has been observed to occur under irradiation by heavy ions [85,86]. In analogy with mechanical deformation, the viscosity is assumed to have a similar dependence on fission rate as it has on mechanically induced strain rate, i.e.…”

Dimensional changes of silica-, borosilicate- and germania-glasses and quartz under irradiation

“…This indicates that viscous flow in glass proceeds by other mechanisms than those considered for metals. In glassy B 2 O 3 , irradiated with 1.66 MeV 40 Ar ions, a creep compliance of about 1 · 10 À27 m 2 /Pa was observed (taken at 227°C) [47], which fits to the compliances of the heavy ions in SiO 2 (Fig. 10), if plotted versus S e (%1 · 10 12 eV/m), while no agreement would be obtained for S n (%4 · 10 8 eV/ m).…”

Incubation Dose for Ion Beam Induced Anisotropic Growth of Amorphous Alloys: Insight into Amorphous State Modifications

“…In this energy range, heavy ions with sufficiently high electronic stopping power (S e . 5 keV͞nm) induce in amorphous materials at low temperatures (T irr # 200-300 K) two striking deformation phenomena: (i) anisotropic expansion ("growth") of unstressed amorphous foil samples perpendicular to the ion-beam direction [2-8] and (ii) creep of stressed amorphous samples with creep or stress relaxation rates [7][8][9][10][11][12][13] which are larger by orders of magnitude than those in crystalline or polycrystalline materials.At medium electronic stopping power (5-30 keV͞nm) the occurrence of both deformation phenomena, i.e., (i) and (ii), requires some incubation fluence (dose) f c which depends on the electronic and nuclear stopping powers, irradiation temperature, and amorphous material properties [2,3,5,6].Recently, ion-beam induced anisotropic growth [14-17] and creep (or stress relaxation) [16][17][18] of amorphous materials have been described in terms of viscous flow and shear stress relaxation in locally heated and damaged regions in the vicinity of the ion trajectories. In the case of anisotropic growth, the shear stress, assumed to relax upon temporal local heating in the vicinity of the projectile trajectory, is due to the thermal expansion in the heated cylindrical track whereas in the creep (stress relaxation) it is given simply by the externally applied macroscopic stress.…”

“…In this energy range, heavy ions with sufficiently high electronic stopping power (S e . 5 keV͞nm) induce in amorphous materials at low temperatures (T irr # 200-300 K) two striking deformation phenomena: (i) anisotropic expansion ("growth") of unstressed amorphous foil samples perpendicular to the ion-beam direction [2-8] and (ii) creep of stressed amorphous samples with creep or stress relaxation rates [7][8][9][10][11][12][13] which are larger by orders of magnitude than those in crystalline or polycrystalline materials.…”