Hexagonal hafnium, zirconium phosphate luminescent material, met

Details Hexagonal hafnium, zirconium phosphate luminescent material, met Hexagonal hafnium, zirconium phosphate luminescent material, met

1976-11-08

1978-09-05

Cooper, Jack

Stock material or miscellaneous articles

Metal continuous phase interengaged with nonmetal continuous...

423306, 2523014P, 2523014F, 250460, 250483, C09K 1142

Patent

active

041121945

ABSTRACT:
A mixture of starting materials, corresponding to an oxide composition within an area of the ternary diagram for (Hf,Zr)O.sub.2, A.sub.2 O, P.sub.2 O.sub.5 formed by connecting end member points defined by the molar compositions: 45 (Hf,Zr)O.sub.2 - 10 A.sub.2 O - 45 P.sub.2 O.sub.5 ; 45 (Hf,Zr)O.sub.2 - 45 A.sub.2 O - 10 P.sub.2 O.sub.5 ; and 10 (Hf,Zr)O.sub.2 - 45 A.sub.2 O - 45 P.sub.2 O.sub.5, reacts to form large single crystalline essentially hexagonal particles of a new compound (Hf.sub.1-x Zr.sub.x).sub.3-y A.sub.4y (PO.sub.4).sub.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 intensifying 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.

REFERENCES:
patent: 3484383 (1969-12-01), Hoffman
patent: 3488292 (1970-01-01), McAllister
patent: 3527710 (1970-09-01), Toma et al.
patent: 3544483 (1970-12-01), Lagos
patent: 3905912 (1975-09-01), Mathers
Alberti et al., "J. Inorg. & Nucl. Chem.", 1974, 36(3) pp. 661-664.

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