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Title: Growth of purified calcium fluoride and magnesium fluoride and degradation of optical properties by defects

Abstract

This report describes the purification and crystal growth portion of the research undertaken in this program. Several new devices for conducting chemical operations in isolated environments were perfected. The precipitator/decanter system was the most important of these. Without it the very large number of precipitate washing cycles required would have been prohibitive due to the time required using the older design. The purification process improved the purity of both fluorides. Precipitation of the alkaline earth carbonates from an alkaline solution was extremely effective in removing alkali ions. The second stage of the process used ion-exchange to remove transition metal ions and to reduce the concentration of other alkaline earths. The third stage of the process was the precipitation and washing of the product fluoride which proved to be difficult because these fluorides form gels or sols when pure. At an ammonium fluoride concentration near 8M a satisfactory precipitate was obtained. Only after a long resting period could the precipitate be washed without converting to a gel or sol. Magnesium fluoride had a much greater tendency to form gels than the calcium salt. Crystal growth was attempted by a Stockbarger method using HF as the reactive gas. The remainder of thismore » report describes the research on the effect of defects on the optical properties of optical materials. The Landau-Placzek ratio and the method for calculating its theoretical value is described. This establishes a comparison standard for studies of doped crystals discussed in the remaining chapters of this report. As part of the preparation of the crystals for optical studies the distribution coefficients for cadmium, calcium and lead were measured and are reported. 121 refs., 30 figs., 22 tabs.« less

Authors:
;
Publication Date:
Research Org.:
Oregon State Univ., Corvallis (USA)
OSTI Identifier:
5716738
Report Number(s):
DOE/ET/33078-T1
ON: DE85011263
DOE Contract Number:  
AT06-80ET33078
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CALCIUM FLUORIDES; CRYSTAL GROWTH; OPTICAL PROPERTIES; PURIFICATION; MAGNESIUM FLUORIDES; BREAKDOWN; BRILLOUIN EFFECT; CADMIUM; ION EXCHANGE; SCATTERING; SOLUBILITY; STOCKBARGER METHOD; ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CALCIUM HALIDES; COHERENT SCATTERING; CRYSTAL GROWTH METHODS; ELEMENTS; FLUORIDES; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; MAGNESIUM COMPOUNDS; METALS; PHYSICAL PROPERTIES; 400201* - Chemical & Physicochemical Properties

Citation Formats

Fredericks, W J, and Collins, P R. Growth of purified calcium fluoride and magnesium fluoride and degradation of optical properties by defects. United States: N. p., 1983. Web.
Fredericks, W J, & Collins, P R. Growth of purified calcium fluoride and magnesium fluoride and degradation of optical properties by defects. United States.
Fredericks, W J, and Collins, P R. Sat . "Growth of purified calcium fluoride and magnesium fluoride and degradation of optical properties by defects". United States.
@article{osti_5716738,
title = {Growth of purified calcium fluoride and magnesium fluoride and degradation of optical properties by defects},
author = {Fredericks, W J and Collins, P R},
abstractNote = {This report describes the purification and crystal growth portion of the research undertaken in this program. Several new devices for conducting chemical operations in isolated environments were perfected. The precipitator/decanter system was the most important of these. Without it the very large number of precipitate washing cycles required would have been prohibitive due to the time required using the older design. The purification process improved the purity of both fluorides. Precipitation of the alkaline earth carbonates from an alkaline solution was extremely effective in removing alkali ions. The second stage of the process used ion-exchange to remove transition metal ions and to reduce the concentration of other alkaline earths. The third stage of the process was the precipitation and washing of the product fluoride which proved to be difficult because these fluorides form gels or sols when pure. At an ammonium fluoride concentration near 8M a satisfactory precipitate was obtained. Only after a long resting period could the precipitate be washed without converting to a gel or sol. Magnesium fluoride had a much greater tendency to form gels than the calcium salt. Crystal growth was attempted by a Stockbarger method using HF as the reactive gas. The remainder of this report describes the research on the effect of defects on the optical properties of optical materials. The Landau-Placzek ratio and the method for calculating its theoretical value is described. This establishes a comparison standard for studies of doped crystals discussed in the remaining chapters of this report. As part of the preparation of the crystals for optical studies the distribution coefficients for cadmium, calcium and lead were measured and are reported. 121 refs., 30 figs., 22 tabs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {1}
}

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