Hexagonal hafnium zirconium phosphate luminescent material

Details Hexagonal hafnium zirconium phosphate luminescent material Hexagonal hafnium zirconium phosphate luminescent material

C - Chemistry, Metallurgy

01

B

31/201, 23/67, 1

C01B 25/37 (2006.01) C09K 11/70 (2006.01)

Patent

CA 1094288

ABSTRACT A mixture of starting materials, corresponding to an oxide composition within an area of the ternary diagram for (Hf,Zr)02, A20, P205 formed by connecting end member points defined by the molar compositions: 45 (Hf,Zr)02 - 10 A20 - 45 P205; 45 (Hf,Zr)02-45 A20 - 10 P205; and 10 (Hf,Zr)02 - 45 A20 - 45 P205, reacts to form large single crystalline essentially hexagonal particles of a new compound (Hf1-xZrx)3-yA4y(PO4)4, and an aqueous-soluble second phase removable by washing. The large single crystalline hexagonal particles are useful as the luminescent material in x-ray intensi- fying screens, with band emission which overlaps at least partially the absorption edge of an x-ray film base to give good image resolution without crossover distortion.

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