Preparation of yttria-gadolinia ceramic scintillators by vacuum

Details Preparation of yttria-gadolinia ceramic scintillators by vacuum Preparation of yttria-gadolinia ceramic scintillators by vacuum

1982-06-18

1984-08-21

Parrish, John A.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Optical fiber, waveguide, or preform

264332, 264345, C04B 3332

Patent

active

044669305

ABSTRACT:
Polycrystalline ceramic scintillators are prepared by a vacuum hot-pressing method. The process includes pressing a multicomponent powder at high temperature under vacuum. Following a holding period, the pressure and temperature are increased and maintained for a predetermined length of time. The finished scintillator includes Y.sub.2 O.sub.3, Gd.sub.2 O.sub.3, and one or more of Eu.sub.2 O.sub.3, Nd.sub.2 O.sub.3, Yb.sub.2 O.sub.3, Dy.sub.2 O.sub.3, Pr.sub.2 O.sub.3, and Tb.sub.2 O.sub.3 rare earth activator oxides. At least one of the oxides of elements Zr, Th, and Ta is included as a transparency promoting densifying agent. At least one of CaO and SrO may be included as a light output restorer.

REFERENCES:
patent: 3545987 (1970-12-01), Anderson
patent: 3640887 (1972-02-01), Anderson
patent: 3666676 (1972-05-01), Rabatin et al.
patent: 3842012 (1974-10-01), Hoppenbrouwers
patent: 3878280 (1975-04-01), Dutta
patent: 4147744 (1979-04-01), Rhodes
patent: 4224524 (1980-09-01), Suys et al.
patent: 4225653 (1980-09-01), Brixner
patent: 4242221 (1980-12-01), Cusano et al.
Carnall et al., "Transparent Gd.sub.2 O.sub.3 Ceramics and Phosphors" article Lefever et al., Transparent Yttrium Oxide Ceramics, 1967, pp. 865-869.
Buchanan et al., "Cathodoluminescent Properties of the Rare Earths in Yttrium Oxide", Journal of Applied Physics, vol. 39, No. 9 Aug. 1968, pp. 4342-4347.
Rhodes, "Controlled Transient Solid Second-Phase Sintering of Yttria" Journal of the American Ceramic Society, vol. 64, No. 1, Jan. 1981 pp. 13-19.

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