E.i. Dupont De Nemours and Company

Lothar H Brixner

August Ferretti

Robert Joseph Bouchard

John D Bierlein

Michael John Popowich

William Yang-Hsing Hsu

Jacob Beutel

A europium-doped barium fluorohalide photostimulable phosphor comprises an amount of oxygen sufficient to create a concentration of anion vacancies effective to substantially increase the stored photostimulable energy, compared to a non-oxygen-treated phosphor.

Photostimulable europium-doped barium fluorobromide phosphors

An improved X-ray intensifying screen comprising phosphor crystals having an effective amount of a light scattering particulate material, e.g., barium sulfate, strontium sulfate, calcium sulfate, titanium dioxide or magnesium oxide, adhered thereto is described. This screen will give high speed and yield an image with increased sharpness when exposed with a single-side coated medical X-ray film element, compared to one made without the particulate material.

X-ray intensifying screens with improved sharpness

There is disclosed a process for producing an optical waveguide comprising contacting at least one optically smooth surface of a single crystal of K.sub.1-x Rb.sub.x TiOMO.sub.4 wherein x is from 0 to 1 and M is P or As with a specified molten salt of at least one of Rb, Cs and Tl at a temperature of from about 200.degree. C. to about 600.degree. C. for a time sufficient to increase the surface index of refraction at least about 0.00025 with respect to the index of refraction of the starting crystal, and cooling the resulting crystal. The product made thereby and a waveguide device using the same are also disclosed.

Process for producing an optical waveguide

Process for producing an optical waveguide and the product therefrom

Photostimulable, potassium-containing anion-deficient BaFCl:Eu/BaFBr:Eu phosphors and X-ray image storage panels therefrom.

X-ray image storage panel comprising anion-deficient BaFCl:Eu/BaFBr:Eu

A process is provided for preparing lanthanum bismuth oxychloride phosphors of formula La.sub.1-x-y Bi.sub.x RE.sub.y OCl, where RE is a rare earth element, x is 0.001 to about 0.25, and y is 0 to 0.005. The process is characterized by a single firing step, and comprises (a) forming an intimate mixture of stoichiometric quantities of La.sub.2 O.sub.3, Bi.sub.2 O.sub.3, and a rare earth oxide of formula RE.sub.2 O.sub.3, together with NH.sub.4 Cl and a flux comprising BaCl.sub.2, where quantities of NH.sub.4 Cl and BaCl.sub.2, by weight, can be independently chosen from between about one-third to about one-half that of the combined weights of the oxides; (b) firing said mixture, in an inert container and in air, according to a time-temperature sequence in which the mixture is heated (1) from 1 to about 4 hours at about 275.degree. C. to 325.degree. C., followed by (2) from 2 to about 4 hours at about 275.degree. C. to 500.degree. C., and concluded by (3) from about 8 to 10 hours at about 800.degree. C. to 1000.degree. C.; and (c) recovering said phosphor from said mixture by washing the mixture with water.

Preparation of lanthanum bismuth oxychloride phosphors

Multilayer capacitors of good electrical properties can be made by firing, in air at low temperatures, certain modified lead titanate dielectric compositions. The dielectric compositions have the formula

Multilayer ceramic capacitors

X-ray intensifying screen based on a rare earth tantalate phosphor, and process for preparing the phosphor, said phosphor having the monoclinic M' structure and selected from:

X-ray intensifying screen based on rare earth tantalate

Process for making multilayer capacitors

Finely divided dielectric powder compositions having the formula (Sr.sub.x Pb.sub.1-x TiO.sub.3).sub.a (PbMg.sub.0.5 W.sub.0.5 O.sub.3).sub.b wherein

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West Chester, PA, United States of America

Lothar H Brixner