摘要:
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.
摘要:
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.
摘要:
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:(a) YNb.sub.x Ta.sub.1-x O.sub.4, where x is 0 to about 0.15;(b) LuNb.sub.x Ta.sub.1-x O.sub.4, where x is 0 to about 0.2;(c) Y.sub.1-y Tm.sub.y TaO.sub.4, where y is 0 to about 0.03;(d) a solid solution of (a) and (b);(e) a solid solution of (a) and (c);(f) Y.sub.1-y Tb.sub.y TaO.sub.4, where y is about 0.001 to about 0.15;(g) Lu.sub.1-y Tb.sub.y TaO.sub.4, where y is about 0.001 to about 0.15;(h) Gd.sub.1-y Tb.sub.y TaO.sub.4, where y is about 0.001 to about 0.15;(i) a solid solution of at least two of (f), (g) and (h);(j) any of (a) to (i) wherein up to 45 mole percent of the yttrium, lutetium or gadolinium is replaced by lanthanum;(k) any of (a) to (i) wherein up to 15 mole percent of the yttrium, lutetium or gadolinium is replaced by ytterbium; and(l) any of (a), (b), (c), (d) and (e) wherein up to 15 mole percent of the yttrium or lutetium is replaced by gadolinium.
摘要:
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.
摘要:
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.
摘要:
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(Sr.sub.x Pb.sub.1-x TiO.sub.3).sub.a (PbMg.sub.0.5 W.sub.0.5 O.sub.3).sub.bwhereinx is 0-0.10,a is 0.35-0.5,b is 0.5-0.65, anda plus b equals one.
摘要翻译:具有良好电性能的多层电容器可以通过在低温空气中焙烧某些改性的钛酸铅电介质组合物来制备。 电介质组合物具有式(Sr x P b 1-x Ti O 3)a(PbMg 0.5 W 0.5 O 3)b,其中x为0-0.10,a为0.35-0.5,b为0.5-0.65,加b等于1。
摘要:
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.
摘要:
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.
摘要翻译:提供了制备式La1-x-yBixREyOCl的镧氧化铋荧光体的方法,其中RE为稀土元素,x为0.001至约0.25,y为0至0.005。 该方法的特征在于单个煅烧步骤,并且包括(a)形成化学计量量的La 2 O 3,Bi 2 O 3和式RE 2 O 3的稀土氧化物与NH 4 Cl和包含BaCl 2的助熔剂的紧密混合物,其中NH 4 Cl和 BaCl 2可以独立地选自氧化物的组合重量的约三分之一至约一半; (b)在惰性容器中和空气中根据时间 - 温度顺序将混合物在约275℃至325℃下加热(1)1至约4小时,随后 在约275℃至500℃下通过(2)2至约4小时,并且在(3)约800至1000℃下约8至10小时得出结论。 和(c)通过用水洗混合物从所述混合物回收所述磷光体。