Reactor and Gamma‐Ray Induced Coloring in Crystalline Quartz and Corning Fused Silica

1955 ◽  
Vol 23 (4) ◽  
pp. 764-765 ◽  
Author(s):  
Paul W. Levy
Keyword(s):  
Gamma Ray ◽  
Fused Silica ◽  
Crystalline Quartz

Physical Chemistry of Hydrogenous Species in the Si-Si02 System

1995 ◽  
Vol 50 (7) ◽  
pp. 653-665 ◽  
Author(s):  
Edward H. Poindexter
Keyword(s):  
Physical Chemistry ◽  
Electric Fields ◽  
Bias Field ◽  
Fused Silica ◽  
Crystalline Quartz ◽  
Device Processing ◽  
Starting Point ◽  
Electrified Interface ◽  
High Electric Fields ◽  
Electrochemical Model

Research on hydrogenous species in the Si-Si02 system is reviewed and examined. Some aspects of thermal silica on silicon are explained by comparison with crystalline quartz or bulk amorphous fused silica. Hydrogen behavior in the Si-Si02 system is complicated by the unique features of device processing technology, an electrified interface, and high electric fields. An electrochemical model of the negative-bias-field-induced degradation of the system is used as a starting point for discussion of diffusion and solubility, atomic H disposition, thermochemical phenomena, and radiation damage. It is thereby hoped to provide new approaches for complete modeling of hydrogen physical chemistry in the Si-Si02 system.

scholarly journals A Comparison of the Indentation Size Effect in Fused Silica and Crystalline Quartz

2014 ◽  
Vol 129 (4) ◽  
pp. 180-183
Author(s):  
Lei Zhang ◽  
Richard C. Bradt
Keyword(s):  
Size Effect ◽  
Surface Area ◽  
Indentation Size Effect ◽  
Indentation Load ◽  
Fused Silica ◽  
Indentation Size ◽  
Crystalline Quartz

Abstract The Indentation Size Effect (ISE) in Fused Silica and Crystalline Quartz were measured by both Knoop and Vicker indenters and both exhibited a crossover for the different indenters at about the same indentation load. The crossover can be explained by the ratio of the (surface area/indentation volume) from the geometries of the two indenters.

Accurate determination of two-photon absorption coefficients in fused silica and crystalline quartz at 264 nm

2001 ◽  
Vol 187 (1-3) ◽  
pp. 185-191 ◽  
Author(s):  
Joanne Nı́ Chróinı́n ◽  
Adrian Dragomir ◽  
John G McInerney ◽  
David N Nikogosyan
Keyword(s):  
Accurate Determination ◽  
Fused Silica ◽  
Photon Absorption ◽  
Absorption Coefficients ◽  
Crystalline Quartz ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Diffusion von Tritium in Quarz und Quarzglas

1967 ◽  
Vol 22 (6) ◽  
pp. 965-969
Author(s):  
Hj. Matzke
Keyword(s):  
Mass Transport ◽  
Diffusion Process ◽  
Radiation Damage ◽  
Volume Diffusion ◽  
Molecular Form ◽  
Ion Bombardment ◽  
Fused Silica ◽  
Kcal Mole ◽  
Crystalline Quartz ◽  
Diffusion Of Hydrogen

The release of tritium from single crystalline quartz and from fused silica has been measured following 40 keV ion bombardment to a dose of 4 × 1011 ions/cm2. The release can be explained by normal volume diffusion with D0=101±1 cm2 sec-1 for both materials and activation enthalpies of (42 ± 5) kcal/mole for quartz and (52 ± 5) kcal/mole for fused silica. Release from quartz is faster than release from fused silica. This latter diffusion process, however, is essentially slower than diffusion of hydrogen during permeation. Possible reasons for this discrepancy are the existence of radiation damage due to the ion bombardment or the chemical state of hydrogen which cause a different elementary process for mass transport: Hydrogen diffuses in molecular form during permeation whereas probably tritium atoms or ions will diffuse following ion bombardment.

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