Effects of gravity on processing heavy metal fluoride fibers

1997 ◽  
Vol 12 (9) ◽  
pp. 2223-2225 ◽  
Author(s):  
Dennis S. Tucker ◽  
Gary L. Workman ◽  
Guy A. Smith
Keyword(s):  
Heavy Metal ◽  
Crystallization Temperature ◽  
Normal Gravity ◽  
Crystal Nucleation ◽  
Sounding Rocket ◽  
Metal Fluoride ◽  
Reduced Gravity ◽  
Rocket Flight ◽  
Heavy Metal Fluoride

The effects of gravity on the crystal nucleation of heavy metal fluoride fibers have been studied in preliminary experiments utilizing NASA's KC-135 reduced gravity aircraft and a microgravity sounding rocket flight. Commercially produced fibers were heated to the crystallization temperature in normal and reduced gravity. The fibers processed in normal gravity showed complete crystallization while the fibers processed in reduced gravity did not show signs of crystallization.

Heavy Metal Fluoride Glasses. New Developments

1984 ◽  
Author(s):  
Jacques Lucas ◽  
Denis Tregoat ◽  
Ahmed El Houari ◽  
Gilles Fonteneau
Keyword(s):  
Heavy Metal ◽  
Metal Fluoride ◽  
New Developments ◽  
Fluoride Glasses ◽  
Heavy Metal Fluoride ◽  
Heavy Metal Fluoride Glasses

Electrochemical purification of heavy metal fluoride glasses for laser-induced fluorescent cooling applications

1997 ◽  
Vol 213-214 ◽  
pp. 95-100 ◽  
Author(s):  
J.C. Fajardo ◽  
G.H. Sigel ◽  
B.C. Edwards ◽  
R.I. Epstein ◽  
T.R. Gosnell ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Fluoride ◽  
Fluoride Glasses ◽  
Heavy Metal Fluoride ◽  
Heavy Metal Fluoride Glasses

Light scattering in heavy-metal fluoride glasses in infra-red spectral region

1986 ◽  
Vol 22 (3) ◽  
pp. 117 ◽  
Author(s):  
D.C. Tran ◽  
K.H. Levin ◽  
R.J. Ginther ◽  
G.H. Sigel ◽  
A.J. Bruce
Keyword(s):  
Heavy Metal ◽  
Light Scattering ◽  
Spectral Region ◽  
Metal Fluoride ◽  
Fluoride Glasses ◽  
Infra Red ◽  
Heavy Metal Fluoride ◽  
Heavy Metal Fluoride Glasses

Reaction of NF3 and SF6 with some oxides connected with heavy-metal fluoride glass processing

1988 ◽  
Vol 3 (4) ◽  
pp. 755-760 ◽  
Author(s):  
M. M. Broer ◽  
R. M. Atkins
Keyword(s):  
Heavy Metal ◽  
Sulfur Hexafluoride ◽  
Glass Melting ◽  
Fluoride Glass ◽  
Metal Fluoride ◽  
Ir Absorption ◽  
Melting Temperatures ◽  
Glass Processing ◽  
Pure Oxide ◽  
Heavy Metal Fluoride

The fluorinating properties of NF3 and SF6 in heavy-metal fluoride glass processing were investigated between 200 and 1100 °C. Using infrared (IR) absorption spectroscopy the reactions of NF3 with ZrO2 and Al2O3 and the reactions of SF6 with ZrO2, SiO2, and Ni were studied. The reaction of NF3 with zirconia and alumina starts at 300 and 650 °C, respectively (yielding nitrogen oxides, nitrogen oxyfluoride, and presumably the metal fluorides). The reaction of SF6 and zirconia starts at 600 °C, yielding SO2F2. Sulfur hexafluoride and silica yield (above 900 °C) SiF4, SO2F2, and SOF2. Nickel and SF6 react above 700 °C yielding SF4 (and presumably NiF4). The results indicate that both gases are effective in oxide conversion at typical fluoride glass melting temperatures (800–900 °C). In addition NF3 can be used as a low-temperature fluorinating source for both oxide containing fluoride and pure oxide precursors. This offers great advantages over the use of solid NH4HF2, which is typically used and which forms an additional source of contamination.

EPR of Cu2+ ions in heavy metal fluoride glasses

1986 ◽  
Vol 86 (3) ◽  
pp. 293-302 ◽  
Author(s):  
L.D. Bogomolova ◽  
E.G. Grechko ◽  
V.A. Jachkin ◽  
N.A. Krasil'nikova ◽  
V.V. Sahkarov
Keyword(s):  
Heavy Metal ◽  
Metal Fluoride ◽  
Fluoride Glasses ◽  
Heavy Metal Fluoride ◽  
Heavy Metal Fluoride Glasses
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