Abstract
A concentration cell procedure, based on the method of Furman and Low, is employed to study chloride retention in zinc sulfide powders. Amounts of 0.001% by weight of chloride in 1 g of zinc sulfide can be determined quantitatively. Zinc sulfide powders with physically admixed or coprecipitated chloride are processed in open boats with variations in firing time and temperature; the retained chloride is determined. The chloride retained after displacement of surface chloride is defined as “volume chloride.” It is found that the retention of volume chloride in zinc sulfide is similar whether zinc chloride or sodium chloride is used as the flux; a peak concentration is observed in both cases after processing near 500 °C. The experimental results are interpreted and found significant in elucidating the mechanism of the incorporation of chloride into zinc sulfide powder during phosphor preparation.
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