PHOSPHATE AND PHOSPHORS PREPARED THEREFROM

A new form of gamma - calcium pyrophosphate having a rhambohedral crystal shape and regular particle size, more especially in the range 8-81/2 microns, is prepared by controlled heating of anhydrous calcium hydrogen phosphate having a similar crystal form and particle size. The latter phosphate is p...

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Hauptverfasser:	JOSEPH A.G. BRUCE, HENRY M. LEVY, PYLISS OBORN
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY COMPOUNDS THEREOF DYES INORGANIC CHEMISTRY MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NON-METALLIC ELEMENTS PAINTS POLISHES
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Beschreibung
Zusammenfassung:	A new form of gamma - calcium pyrophosphate having a rhambohedral crystal shape and regular particle size, more especially in the range 8-81/2 microns, is prepared by controlled heating of anhydrous calcium hydrogen phosphate having a similar crystal form and particle size. The latter phosphate is prepared by precipitation of brushite and dehydration in an aqueous medium such as aqueous phosphoric acid at an elevated temperature. When the new pyrophosphate is employed as a source of calcium and phosphate ions in the preparation of luminescent phosphors, the products have enhanced luminescent brightness as compared with those produced from conventional calcium hydrogen phosphate.