scholarly journals Radiation Effects on Transport and Bubble Formation in Silicate Glasses

2001 ◽  
Author(s):  
A D Trifunac ◽  
I A Shkrob ◽  
D W Werst
Keyword(s):  
Radiation Effects ◽  
Bubble Formation ◽  
Silicate Glasses

scholarly journals Radiation Effects on Transport and Bubble Formation in silicate Glasses

1999 ◽  
Author(s):  
Alexander D Trifumcac
Keyword(s):  
Radiation Effects ◽  
Bubble Formation ◽  
Silicate Glasses

scholarly journals Radiation Effects on Transport and Bubble Formation in Silicate Glasses

2000 ◽  
Author(s):  
A D Trifunac ◽  
I A Shkrob ◽  
D W Werst
Keyword(s):  
Radiation Effects ◽  
Bubble Formation ◽  
Silicate Glasses

Direct observations of radiation-enhanced transformations in glass

1983 ◽  
Vol 41 ◽  
pp. 354-355
Author(s):  
J. F. DeNatale ◽  
D. G. Howitt
Keyword(s):  
Glass Matrix ◽  
Diffusion Mechanism ◽  
Bubble Formation ◽  
Silicate Glasses ◽  
Phase Decomposition ◽  
Direct Observations ◽  
Thin Foils ◽  
Oxygen Bubble ◽  
Electron Energy Loss ◽  
Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

Radiation effects on thermal expansion of some ternary alkali-silicate glasses

1993 ◽  
Vol 152 (2-3) ◽  
pp. 195-200 ◽  
Author(s):  
F.M. Ezz-Eldin ◽  
H.A. El-Batal
Keyword(s):  
Thermal Expansion ◽  
Radiation Effects ◽  
Silicate Glasses ◽  
Alkali Silicate

Ca-SiAlON Glasses: Effects of Fluorine on Glass Formation and Properties

2007 ◽  
Vol 352 ◽  
pp. 165-172 ◽  
Author(s):  
Stuart Hampshire ◽  
Amir R. Hanifi ◽  
Annaik Genson ◽  
Michael J. Pomeroy
Keyword(s):  
Glass Formation ◽  
Mechanical Stability ◽  
Nitrogen Loss ◽  
Bubble Formation ◽  
Glass Network ◽  
Silicate Glasses ◽  
Bioactive Materials ◽  
Glass Melts ◽  
Glass Forming ◽  
Alumino Silicate

Oxynitride glasses are effectively alumino-silicate glasses in which nitrogen substitutes for oxygen in the glass network, resulting in increases in glass transition and softening temperatures, viscosities (by two to three orders of magnitude), elastic moduli and microhardness. Calcium alumino-silicate glasses containing fluorine are known to have useful characteristics as potential bioactive materials. Therefore, the combination of both nitrogen and fluorine additions to these glasses may give useful bioglasses with enhanced mechanical stability. This paper gives a review of oxynitride glasses and reports glass formation and evaluation of glass properties in the Ca-Si-Al-O-N-F system. Within the previously defined glass forming region in the Ca-Si-Al-O-N system, homogeneous, dense glasses are formed. However, addition of fluorine affects glass formation and reactivity of the glass melts and can lead to fluorine loss as SiF4, but also nitrogen loss, and cause bubble formation. At high fluorine and high Ca contents under conditions when Ca- F bonding is favoured, CaF2 crystals precipitate in the glass. It was found that fluorine expands the glass forming region of Ca-Sialon system and facilitates the solution of nitrogen into the melt.

Radiation Effects in Silicate Glasses - A Review

1988 ◽  
Vol 125 ◽  
Author(s):  
Ned E. Bibler ◽  
David G. Howitt
Keyword(s):  
Fiber Optics ◽  
Nuclear Waste ◽  
Radiation Effects ◽  
Alpha Particles ◽  
Phase Changes ◽  
Silicate Glasses ◽  
Atomic Displacements ◽  
High Level Nuclear Waste ◽  
Nuclear Waste Immobilization ◽  
High Level

ABSTRACTThe study of radiation effects in complex silicate glasses has received renewed attention because of their use in special applications such as high level nuclear waste immobilization and fiber optics. Radiation changes the properties of these glasses by altering their electronic and atomic configurations. These alterations or defects may cause dilatations or microscopic phase changes along with absorption centers that limit the optical application of the glasses. Atomic displacements induced in the already disordered structure of the glasses may affect their use where heavy irradiating particles such as alpha particles, alpha recoils, fission fragments, or accelerated ions are present. Large changes (up to 1%) in density may result. In some cases the radiation damage may be severe enough to affect the durability of the glass in aqueous solutions.In this paper, we review the literature concerning radiation effects on density, durability, stored energy, microstructure and optical properties of silicate glasses. Both simple glasses and complex glasses used for immobilization of nuclear waste are considered.

Radiation Effects in Radwaste Glasses : A Reappraisal of Alpha-Recoil Aging as Simulated by Ion Implantation.

1981 ◽  
Vol 6 ◽  
Author(s):  
J.C. Dran ◽  
Y. Langevin ◽  
M. Maurette ◽  
J.C. Petit
Keyword(s):  
Monte Carlo ◽  
Ion Implantation ◽  
Radiation Damage ◽  
Radiation Effects ◽  
Chemical Reactivity ◽  
Monte Carlo Model ◽  
Silicate Glasses

ABSTRACTNew results on the etchability of lead implanted silicate glasses are presented which are satisfactorily accounted for by a Monte Carlo Model of etching. These results strongly support the radiation damage origin of the ion-induced modification of the chemical reactivity of glass. Major artefacts of ion implantation are then discarded as possible causes of the observed effects and consequently this technique is shown to be a valuable tool for the study of α-recoil aging in H.L.W. glasses.

Gamma Radiation Effects on the Optical Properties of Yb-doped Silicate Glasses

2012 ◽  
Vol 27 (8) ◽  
pp. 860-864
Author(s):  
Yu-Bang SHENG ◽  
Rui-Xian XING ◽  
Huai-Xun LUAN ◽  
Zi-Jun LIU ◽  
Jin-Yan LI ◽  
...  
Keyword(s):  
Optical Properties ◽  
Gamma Radiation ◽  
Radiation Effects ◽  
Silicate Glasses

scholarly journals Gamma radiation effects on absorption and emission properties of erbium-doped silicate glasses

2012 ◽  
Vol 61 (11) ◽  
pp. 116301
Author(s):  
Sheng Yu-Bang ◽  
Yang L-Yun ◽  
Luan Huai-Xun ◽  
Liu Zi-Jun ◽  
Li Jin-Yan ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Radiation Effects ◽  
Silicate Glasses ◽  
Absorption And Emission ◽  
Emission Properties ◽  
Erbium Doped
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