Chemistry of inorganic compounds – Halogen or compound thereof – Binary fluorine containing compound
Patent
1977-03-21
1978-05-16
Stern, Edward
Chemistry of inorganic compounds
Halogen or compound thereof
Binary fluorine containing compound
423263, 423464, 423489, C01F 1122, C01F 1700, C01F 528, C01B 908
Patent
active
040899373
ABSTRACT:
A hot-pressed optical body which is free from absorption bands due to carbon dioxide, water, hydroxyl ion and acid fluorides in the ultraviolet, visible and near-infrared wavelength regions. Typically, the optical body is formed from a powder of an alkaline earth metal fluoride, alkali metal fluoride, or rare earth metal fluoride. One or more absorption bands due to a single impurity may be reduced or eliminated, or bands due to plural impurities may be reduced or eliminated sequentially, or simultaneously. The optical body is made by flowing a reactive, reducing gas, optionally, in combination with hydrogen fluoride gas, directly into the die cavity containing a pressable ionic fluoride powder, and either hot-pressing or extruding the powder.
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Packer Herbert
Swinehart Carl F.
Lobo Alfred D.
Lucas James A.
Stern Edward
The Harshaw Chemical Company
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