Abstract: The present invention relates to novel acicular particles, processes for using the same, and magnetic materials prepared from such particles. In particular, the invention relates to an acicular particulate material containing iron carbide and having a high coercive force (Hc) an orientation property in a magnetic field.

Abstract: A low power loss Mn-Zn ferrite consists essentially of Fe.sub.2 O.sub.3, MnO and ZnO at a given mole ratio and contains given amounts of SiO.sub.2, CaO, niobium oxide and titanium oxide or antimony oxide as trace additives. This ferrite is suitable as a transformer material for switched mode power supply.

Abstract: A process for preparing X-ray intensifying M' monoclinic tantalate phosphors by firing precursor oxides in a novel flux mixture of alkali metal sulfate/alkali metal or alkaline earth chloride/alkali metal metasilicate. Tantalate phosphors made in this manner have improved X-ray to light conversion efficiency. X-ray intensifying screens made from these phosphors have improved speed and can be used with good results with a plurality of X-ray film elements.

Abstract: A doubly activated yttriuim aluminum garnet (YAG) phosphor, activated with both europium and chromium, is provided. The concentration of Eu ranges from about 1 to 5 at %, while the concentration of Cr ranges from about 0.1 to 1 at %. The YAG:Eu,Cr phosphor has a line spectrum which more closely matches the spectral sensitivity of amorphous silicon liquid crystal light valves thereby, providing more efficient use of the available energy.

Abstract: A method for producing goethite having an axial ratio of at least 7 and a specific surface area of 20-80 m.sup.2 /g and suitable for use in the production of .alpha.-iron powder, which method comprises intermittently feeding an oxidizing gas into a suspension of ferrous hydroxide, which has been obtained by reacting a ferrous salt with an alkali hydroxide, preferably while controlling the oxidation rate of ferrous hydroxide below 7% per each feeding-feed-stopping cycle of the oxidizing gas and also controlling the feeding time period of the oxidizing gas within 10 minutes and shorter than a quarter of the feed-stopping time period per each feeding-feed-stopping cycle of the oxidizing gas.

Abstract: A method for recording and reproducing an X-ray image is provided which method comprises the steps of:(1) causing a photostimulable phosphor to absorb image-wise or pattern-wise modulated X-rays,(2) photostimulating said phosphor with stimulating electromagnetic radiation selected from visible light and infrared light to release from the phosphor in accordance with the absorbed X-rays electromagnetic radiation different in wavelength characteristic from the radiation used in the photo-stimulation, and(3) detecting said light emitted by photostimulation, wherein said phosphor is a haloborate.

Abstract: A photostimulable X-ray energy absorbing halosilicate, halogermanate or halo(silicate-germanate) phosphor, characterized in that said phosphor contains as host metal at least one alkaline earth metal, as halogen at least one member selected from the group consisting of Cl, Br and I, as dopant Eu.sup.2+ and as co-dopant at least one member selected from the group consisting of niobium and tantalum.

Abstract: The present invention concerns a process for preparing magnetic particles of barium or strontium hexaferrites exhibiting a good dispersibility and improved magnetic properties. The process involves coprecipitating an iron salt with a barium or strontium salt, filtering and neutralizing the resulting coprecipitate, and washing it with a solution of a barium or strontium salt having a concentration in the range of 2.times.10.sup.-3 0.2 M.

Abstract: The present invention provides a process for the preparation of a small particle size borate lamp phosphor by preparing a dispersed suspension containing particles of a borate lamp phosphor precursor, adding a sufficient amount of boric acid to the dispersed suspension to provide for the mutual isolation of the borate lamp phosphor precursor particles in the boric acid, drying the mixture under conditions suitable for retaining the precursor as a dispersed phase in a matrix of boric acid, communicating the dried mixture, firing the comminuted mixture under conditions suitable for converting the precursor to a small particle size borate lamp phosphor product in a matrix of boric oxide while maintaining the mutual isolation of the product particles, and contacting the resulting mixture with water to solubilize substantially all of the boric oxide and separate the small particle size borate lamp phosphor product.

Abstract: An x-ray intensifying screen is disclosed containing magnesium tantalum niobium oxide as a phosphor in an ordered corundum crystalline form. In addition, small amounts of at least one alkali metal other than lithium can be present. Potassium, rubidium and cesium are each capable of increasing luminescence. The x-ray intensifying screens are useful in radiographic applications where it is important to reduce subject exposure to x-rays and also to create clear, sharp images.

Abstract: A fluorescent composition for low velocity electron beam excitation, comprising a phosphor containing a sulfide of the formula (Zn.sub.1-x,Cd.sub.x)S wherein x is a number satisfying a condition of 0.ltoreq.X.ltoreq.1, as the host material, and an electrically conductive material mixed or mutually adhered to each other, wherein the half value width (2.theta.) of the strongest diffraction line in the diffraction X-ray spectrum of said sulfide is within a range of from 0.05.degree. to 0.16.degree..

Abstract: A method of making a lanthanum cerium terbium phosphate phosphor involves the single-step reaction of single-phase, mixed valence state lanthanum cerium terbium oxide with boron phosphate in the presence of a flux-forming compound containing lithium. The resulting phosphor is up to 5% brighter than the same phosphor prepared without the lithium-containing compound.

Abstract: Cubic boron nitride having an impurity profile as set out below has been found to exhibit excellent thermoluminescent properties with a high gamma radiation sensitivity and low light sensitivity:______________________________________ Impurity Content - less than ______________________________________ Carbon 1100 ppm Oxygen 1500 ppm Silicon 100 ppm Phosphorus 30 ppm Titanium 30 ppm Beryllium 1 ppm ______________________________________

Abstract: A phosphor for a vacuum fluorescent display composed of a ZnO:Zn phosphor material mixed with tungsten oxide powder and Zn microfine powder, each of which is in the range of 0.01 weight % to 3 weight %.

Abstract: A phosphor comprising a phosphor and zinc oxide formed in a suspension of the phosphor and attached to the surface of the phosphor.

Abstract: Disclosed herein is a magnetic iron oxide particle comprising a magnetic iron oxide core particle containing ferrous iron, a Zn compound layer as a lower coating layer on the surface of said core particle, and an Si compound layer as an upper coating layer thereon.

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: This invention relates to terbium activated silicate luminescent glasses exhibiting reduced afterglow and enhanced luminescence due to incorporation therein of selected rare earth oxides of cerium, europium and godolinium.

Abstract: This invention relates to rare earth tantalate and/or niobate phosphors which emit light under X-ray excitation, and an X-ray intensifing screen which utilizes these phosphors. The phosphor is represented by the general formula (I);.sup.Ln 1-x-(2/3)y-(1/3)z.sup.M" y.sup.M' z.sup.DO 4:xR.sup.3+(I)In this formula, M" is at least one kind of divalent metal selected from the group consisting of Be, Mg, Ca, Sr, Zn and Cd, M' is at least one kind of alkali metal selected from the group consisting of Li, Na, Ba and K, Ln is at least one kind of element selected from the group consisting of Y, Gd, La and Lu, D consists of Ta and/or Nb, and R is at least one selected from the group conssiting of Tm, Pr, Sm, Eu, Tb, Dy and Yb, y is a value in the range 1.times.10.sup.-5 .ltoreq.y.ltoreq.1, z is a value in range 1.times.10.sup.-4 .ltoreq.z.ltoreq.0.1, and x is a numerical value in the range 0.ltoreq..times..ltoreq.0.05.

Abstract: This invention relates to terbium activated silicate luminescent glasses exhibiting reduced afterglow and enhanced luminescence due to incorporation therein of selected rare earth oxides of cerium, europium and gadolinium.