Developing methodologies for source attribution: glass phase separation in Trinitite using NF3

2017 ◽  
Vol 105 (5) ◽  
Author(s):  
Elizabeth C. Koeman ◽  
Bruce K. McNamara ◽  
Frances N. Smith ◽  
Antonio Simonetti ◽  
Peter C. Burns
Keyword(s):  
Phase Separation ◽  
Glass Phase ◽  
Source Attribution ◽  
Nitrogen Trifluoride ◽  
Thermal Reactions ◽  
Fluorinating Agent

AbstractThis study details thermal reactions between glasses, common minerals, and Trinitite post-detonation material with the fluorinating agent nitrogen trifluoride (NF

scholarly journals High Level Radioactive Waste Glass Production and Product Description

1993 ◽  
Vol 333 ◽  
Author(s):  
James F. Sproull ◽  
Sharon L. Marra ◽  
Carol M. Jantzen
Keyword(s):  
Phase Separation ◽  
Radioactive Waste ◽  
Glass Phase ◽  
Glass Production ◽  
Waste Glass ◽  
Glass Product ◽  
High Level Radioactive Waste ◽  
The Matrix ◽  
High Level ◽  
Product Description

ABSTRACTA summary of the current state of defense high-level radioactive waste in the U.S. is presented. Reasons for the selection of borosilicate glass as the matrix for the waste glass product over other glasses is enunciated. The product and processing requirements which the waste glass must meet are summarized. Finally the effects of crystallization and glass-in-glass phase separation on waste glass durability are discussed. Crystallization, under typical cooling conditions, has minimal effect on durability but glass-in-glass phase separation should be avoided.

Sintering Behavior of 45S5 Bioglass®

2007 ◽  
Vol 361-363 ◽  
pp. 265-268
Author(s):  
Leila Lefebvre ◽  
Laurent Gremillard ◽  
Jérôme Chevalier ◽  
Didier Bernache-Assollant
Keyword(s):  
Phase Separation ◽  
Glass Phase ◽  
Structural Transformations ◽  
Transition Phase ◽  
Sintering Behavior ◽  
Major Phase ◽  
Sintering Behaviour ◽  
A Minor ◽  
45S5 Bioglass ◽  
Heating Up

In this study, we report on the effect of Bioglass® structural transformations on its sintering behaviour. In a previous paper, we showed that while heating up to 1000°C, five successive transformations occur: glassy transition, phase separation, two crystallization processes and a second glassy transition. The sintering of the material exhibits two main shrinkage stages associated to the two glassy transitions at 550°C and 850°C. At 580°C, the glass-in-glass phase separation induces a decrease of the sintering rate immediately followed by the crystallisation of the major phase Na2CaSi2O6 between 600 and 700°C, from the surface to the bulk of the particles. A completed inhibition of sintering takes place followed by a minor shrinkage due to volume crystallization. A plateau is observed until the second glassy transition.

Preparation Principle and Crystal Growth Kinetics of Loaded Nanocrystal TiO2

2011 ◽  
Vol 194-196 ◽  
pp. 585-588
Author(s):  
Ying Na Zhao ◽  
Wen Li Zhang
Keyword(s):  
Heat Treatment ◽  
Activation Energy ◽  
Phase Separation ◽  
Growth Kinetics ◽  
Glass Phase ◽  
Crystal Growth Kinetics ◽  
Growth Activation ◽  
Kinetics Of ◽  
Separation Size ◽  
Crystalline Growth

Nanocrystal TiO2 photocatalystic materials were prepared by melt-phase separation technique, and its preparation principle was discussed in this paper. Anatase nanometer TiO2 could be obtained by heat-treatment at 550 °C for 10 min, which is well combined with porous glass carrier and the particles size is about 25 nm. The growth kinetics of TiO2 crystalline analysis results showed that the growth activation energy Q1 was about 63.27 KJ/mol (<600 °C), and Q2 was about 22.78 KJ/mol (>600 °C).TiO2 crystalline growth closely related to glass phase separation. TiO2 particles grew quickly with the glass phase separation size increase, and then the particles growth rate became slow because of being limited by glass phase separation structure.

scholarly journals Photodarkening effect suppression in Yb-doped fiber through the nanoporous glass phase-separation fabrication method

2019 ◽  
Vol 9 (3) ◽  
pp. 1085 ◽  
Author(s):  
Nan Zhao ◽  
Kangjie Peng ◽  
Jiaming Li ◽  
Yingbo Chu ◽  
Guiyao Zhou ◽  
...  
Keyword(s):  
Phase Separation ◽  
Glass Phase ◽  
Fabrication Method ◽  
Nanoporous Glass
Sign in / Sign up

Export Citation Format

Share Document