Impurity analysis of heavy metal fluoride glass fibres using selectively excited photoluminescence

1986 ◽  
Vol 22 (24) ◽  
pp. 1278 ◽  
Author(s):  
W.J. Miniscalco ◽  
B.A. Thompson
Keyword(s):  
Heavy Metal ◽  
Fluoride Glass ◽  
Metal Fluoride ◽  
Glass Fibres ◽  
Impurity Analysis ◽  
Heavy Metal Fluoride

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.

Interaction of NF3 with melt confinement materials in fluoride glass processing

1988 ◽  
Vol 3 (2) ◽  
pp. 369-374 ◽  
Author(s):  
R. M. Atkins ◽  
M. M. Broer
Keyword(s):  
Heavy Metal ◽  
Fluoride Glass ◽  
Vitreous Carbon ◽  
Metal Fluoride ◽  
Ir Absorption ◽  
Reaction Products ◽  
Fluoride Glasses ◽  
Glass Processing ◽  
Heavy Metal Fluoride ◽  
Heavy Metal Fluoride Glasses

Nitrogen trifluoride (NF3) was recently used by others as a reactive atmosphere during the melting of heavy metal fluoride glasses. This compound fluorinates oxide impurities, dehydrates the melt, and controls the oxidation state of both glassformer and impurity cations. The reaction of NF3 with nickel, silica, platinum, and vitreous carbon between 200 and 1100°C using IR absorption spectroscopy was investigated. This is an important issue, since reaction products (impurities) from the crucible and containment vessel walls may be incorporated in the melt. All materials, except for nickel, reacted below 600°C yielding corresponding fluorides (and oxides in the case of silica). The results indicate that, directly heated, vitreous carbon crucibles are preferred for melting of fluoride glasses in a NF3 atmosphere.

Reactive atmosphere synthesis of sol-gel heavy metal fluoride glasses

1992 ◽  
Vol 7 (6) ◽  
pp. 1534-1540 ◽  
Author(s):  
A.M. Mailhot ◽  
A. Elyamani ◽  
R.E. Riman
Keyword(s):  
Heavy Metal ◽  
Sol Gel ◽  
Fluoride Glass ◽  
Metal Fluoride ◽  
X Ray Diffraction ◽  
Combustion Analysis ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Heavy Metal Fluoride ◽  
Heavy Metal Fluoride Glasses

A glass based on ZrF4 was synthesized by a combination of sol-gel and reactive atmosphere processing. Infrared spectroscopy and combustion analysis show that the fluorination process reduces the concentration of organic and hydroxide impurities. Chemical changes have occurred during fluorination; this is indicated by different x-ray diffraction traces and crystallization characteristics for the fluorinated sample compared to the oxide gel product. Chemical analysis from x-ray fluorescence indicates that the fluorinated gel is chemically similar to a melted glass of the same composition. Differential scanning calorimetry gives a glass transition temperature of 290 °C and a crystallization temperature of 390 °C. These values are consistent with those expected for a fluoride glass prepared by conventional methods.

Electrochemical purification and GFAAS analysis of heavy metal fluoride glass

1995 ◽  
Vol 184 ◽  
pp. 194-199 ◽  
Author(s):  
Shanci Bao ◽  
P.J. Newman ◽  
A. Voelkel ◽  
Zhiping Zhou ◽  
D.R. MacFarlane
Keyword(s):  
Heavy Metal ◽  
Fluoride Glass ◽  
Metal Fluoride ◽  
Heavy Metal Fluoride

Ion assisted deposition of optical and protective coatings for heavy metal fluoride glass

1986 ◽  
Vol 25 (12) ◽  
pp. 1973 ◽  
Author(s):  
James J. McNally ◽  
Ghanim A. Al-Jumaily ◽  
John R. McNeil ◽  
B. Bendow
Keyword(s):  
Heavy Metal ◽  
Protective Coatings ◽  
Fluoride Glass ◽  
Metal Fluoride ◽  
Heavy Metal Fluoride

Fabrication of heavy metal fluoride glass, optical planar waveguides by hot-spin casting

2008 ◽  
Vol 354 (32) ◽  
pp. 3877-3886 ◽  
Author(s):  
J. Lousteau ◽  
D. Furniss ◽  
H.F. Arrand ◽  
T.M. Benson ◽  
P. Sewell ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Planar Waveguides ◽  
Fluoride Glass ◽  
Metal Fluoride ◽  
Spin Casting ◽  
Heavy Metal Fluoride ◽  
Optical Planar Waveguides
Sign in / Sign up

Export Citation Format

Share Document