Abstract: Doped tungsten powder, or sintered tungsten bodies formed therefrom, having a fine dispersion of oxide particles of at least one metal from the group zirconium, hafnium, lanthanum, yttrium, and rare earth's are formed by the method of this invention. A mixture of a salt solution comprised of a soluble salt of the metal, and a tungsten blue oxide powder is formed. A hydroxide precipitating solution is admixed with the mixture to form a hydroxide precipitate of the metal on the tungsten blue oxide powder. The tungsten blue oxide powder and hydroxide precipitate are heated in a reducing atmosphere to form the tungsten powder having the dispersion of oxide particles. The doped tungsten powder can be consolidated and sintered to form tungsten bodies having a fine dispersion of the metal oxide.

Abstract: A phosphor is disclosed comprised of an effective amount of cerium to provide luminescence, and the balance substantially a gadolinium lutetium aluminate compound having the formula Gd.sub.x Lu.sub.1-x A10.sub.3, where x ranges from about 0.25 to 0.9.

Abstract: A phosphor comprising, an ABO.sub.3 oxide compound wherein A is about 0.002 to 22 atomic percent cerium and up to about 22 atomic percent lanthanum, and B is about 18 to 22 atomic percent of at least one of lutetium or yttrium.

Abstract: A phosphor comprising an effective amount of cerium to provide luminescence, in substantially a lanthanide oxide fluoride compound having a tetragonal crystal form, the lanthanide being from the group consisting of lutetium, gadolinium, yttrium, and mixtures thereof.

Abstract: A phosphor comprising an effective amount of cerium to provide luminescence, and the balance substantially an oxide compound of hafnium and an alkaline earth from the group consisting of barium, strontium, calcium, and mixtures thereof, having substantially a perovskite crystal form.

Abstract: A simplified method of forming polycrystalline translucent-to-transparent yttria-gadolinia composition scintillators comprises forming an aqueous suspension of hydroxide coprecipitates of the yttria-gadolinia composition, and converting the hydroxides to oxalates. The oxalates are neutralized by washing, dried, and granulated to form a finely dispersed oxalate powder. The oxalate powder is calcined, cold pressed to form a compact, and sintered in a reducing atmosphere or vacuum to form the polycrystalline translucent-to-transparent yttria-gadolinia composition scintillator.

Abstract: A simplified method of forming polycrystalline translucent-to-transparent yttria-gadolinia scintillators comprises coprecipitating oxalates of the yttria-gadolinia composition, drying the oxalates at about 75.degree. C. to 125.degree. C., forming an aqueous suspension of the dried oxalates, and agitating the suspension while admixing an effective amount of an ammonium hydroxide solution to disperse agglomerations of the oxalate coprecipitates. The dispersed oxalates are calcined to substantially fully oxidize the oxalates and form an oxide powder of the yttria-gadolinia composition. The oxide powder is cold pressed to form a compact, and the compact is sintered in a reducing atmosphere or vacuum to form the polycrystalline translucent-to-transparent yttria-gadolinia scintillator.

Abstract: An aluminum nitride ceramic body with a thermal conductivity of at least 0.5 W/cm.K at 25.degree. C. is produced by shaping a particulate mixture of aluminum nitride powder and an additive selected from the group consisting of CaF.sub.2, SrF.sub.2, BaF.sub.2 and mixtures thereof into a compact and liquid phase sintering the compact.

Abstract: An aluminum nitride ceramic body with a thermal conductivity of at least 0.5 W/cm.multidot.K at 25.degree. C. is produced by shaping a particulate mixture of aluminum nitride powder and an additive selected from the group consisting of YF.sub.3, ScF.sub.3, LF.sub.3 where L is La, Ce, Pr, Nd, Sm, Gd, Dy, Ho and Er and a mixture thereof into a compact and liquid phase sintering the compact.

Abstract: An improved process for preparing active oxide powders in which cation hydroxide gels, prepared in the conventional manner are chemically dried by alternately washing the gels with a liquid organic compound having polar characteristics and a liquid organic compound having nonpolar characteristics until the mechanical water is removed from the gel. The water-free cation hydroxide is then contacted with a final liquid organic wash to remove the previous organic wash and speed drying. The dried hydroxide treated in the conventional manner will form a highly sinterable active oxide powder.