Polymorphous luminescent compositions
 Polymorphous phosphorescent compounds of the formula MNbOF.sub.5, wherein M is at least one of barium, strontium, lead and calcium, are prepared by the reaction of the appropriate metal oxide or fluoride with niobium(V) oxide in aqueous hydrofluoric acid. 
General Electric Company
C C C C C C
C01P C09K C09K C01P C01G C01P
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John F. Alok M.
Ackerman Srivastava