摘要:
A europium-activated barium aluminate phosphor is described wherein the phosphor is doped with tetravalent ions of Hf, Zr, or Si. Preferably, the phosphor is represented by (Ba1−xEux)MgAl10O17:(Hf,Zr,Si)y where 0.05≦x≦0.25 and 0
摘要翻译:描述了一种铕活化的铝酸钡荧光体,其中磷光体掺杂有Hf,Zr或Si的四价离子。 优选地,磷光体由(Ba x 1-x O x x Si x O x O x O x O x O x O x H x H x ,Zr,Si)其中0.05 <= x <= 0.25且0
摘要:
In a method of preparing an alkaline earth halophospor having an antimony content greater than about 0.70 weight percent, a uniform mixture of starting raw materials is fired with already fired phosphor of the desired alkaline earth halophosphate so that the already fired phosphor is refired in an inert atmosphere containing volitile species from the uniform mixture of starting raw materials.
摘要:
A low-fired ceramic dielectric composition, a multilayer capacitor made from such a ceramic dielectric composition provided with silver/palladium electrodes having at least 65 atomic percent silver, and a method of manufacturing such a multilayer capacitor. The ceramic is barium titanate-based and includes Bi.sub.2 O.sub.3, Nb.sub.2 O.sub.5, and TiO.sub.2 to improve sinterability. MnCO.sub.3 is added to increase the insulation resistance. The multilayer capacitor includes high silver-content electrodes to reduce the quantity of expensive noble metals. The multilayer part may be fired at a temperature of 1150.degree. C. or less to yield a capacitor meeting EIA specification X7R. The low firing temperature also inhibits a chemical reaction between bismuth and palladium.
摘要翻译:低烧陶瓷电介质组合物,由具有至少65原子%银的银/钯电极的这种陶瓷电介质组合物制成的多层电容器以及制造这种多层电容器的方法。 该陶瓷是钛酸钡基,并且包括Bi 2 O 3,Nb 2 O 5和TiO 2以改善可烧结性。 添加MnCO3以增加绝缘电阻。 多层电容器包括高银含量的电极以减少昂贵的贵金属的量。 多层部分可以在1150℃或更低的温度下烧制,以产生符合EIA规范X7R的电容器。 低烧成温度也抑制铋和钯之间的化学反应。
摘要:
An improved nonlinear dielectric element for use in ferroelectric ceramic capacitors is disclosed which exhibits higher operating temperatures and lower coercive field levels than the compositions presently in use. This new composition is based upon Pb(Mg.sub.0.33 Nb.sub.0.67)O.sub.3 as described by the general formulau[Pb(Mg.sub.0.33 Nb.sub.0.67)O.sub.3 ]+v[PbTiO.sub.3 ]+w[Pb(Me.sub.0.50 W.sub.0.50)O.sub.3 ],wherein u, v and w denote mole fractions, and Me represents a metal ion having a +2 valence such as Mg, Zn or Ni. In a preferred embodiment, u.gtoreq.0.65, v.ltoreq.0.35 and w.ltoreq.0.033.
摘要翻译:公开了一种用于铁电陶瓷电容器的改进的非线性介质元件,其显示比目前使用的组合物更高的操作温度和更低的矫顽场电位。 该新组合物基于通式u [Pb(Mg 0.33 Nb 0.67)O 3] + v [PbTiO 3] + w [Pb(Me 0.50 Mo 0.5)O 3]所述的Pb(Mg 0.33 Nb 0.67)O 3 ],其中u,v和w表示摩尔分数,Me表示具有+2价的金属离子,例如Mg,Zn或Ni。 在优选的实施方案中,u> = 0.65,v≤0.35且w u> 0.033。
摘要:
A low fire ceramic dielectric composition, a multilayer capacitor made from such a ceramic dielectric composition provided with silver/palladium electrodes having at least 65 atomic percent silver, and a method of manufacturing such a multilayer capacitor. The ceramic is barium titanate-based and includes Bi.sub.2 O.sub.3, Nb.sub.2 O.sub.5, and TiO.sub.2 to improve sinterability. MnCO.sub.3 is added to increase the insulation resistance. The multilayer capacitor includes high silver-content electrodes to reduce the quantity of expensive noble metals. The multilayer part may be fired at a temperature of 1150.degree. C. or less to yield a capacitor meeting EIA specification X7R. The low firing temperature also inhibits a chemical reaction between bismuth and palladium.
摘要翻译:一种低火陶瓷电介质组合物,由具有至少65原子%银的银/钯电极的这种陶瓷电介质组合物制成的多层电容器以及制造这种多层电容器的方法。 该陶瓷是钛酸钡基,并且包括Bi 2 O 3,Nb 2 O 5和TiO 2以改善可烧结性。 添加MnCO3以增加绝缘电阻。 多层电容器包括高银含量的电极以减少昂贵的贵金属的量。 多层部分可以在1150℃或更低的温度下烧制,以产生符合EIA规范X7R的电容器。 低烧成温度也抑制铋和钯之间的化学反应。
摘要:
A major amount of strontium titanate is modified with additions of lanthanide series rare earth aluminates, titanates and transition metal oxides to provide sintered semiconductive ceramics with enhanced temperature and voltage stability. The modified strontium titanate ceramic, having the general formula:(1-x)SrTiO.sub.3 +x(1-y)[(1-z)LnAlO.sub.3 +zLn.sub..66 TiO.sub.3]+xyLnMO.sub.3,is coated with a fritted electrode material and fired at a temperature below the melting point of the electrode material to cause the frit to diffuse into the ceramic and form insulating boundaries around the ceramic grains. Ceramic capacitors so formed are characterized by their excellent electrical properties, particularly their improved temperature stability as evidenced by extremely low changes in capacitance with temperature.
摘要:
A method is provided for improving the x-ray screen brightness of gadolinium oxysulfide x-ray phosphors. The method applies annealing and acid washing steps in a specific order following deagglomeration of the phosphor in order to ameliorate the loss of brightness caused by the deagglomeration.
摘要:
In a method of preparing an alkaline earth halophospor having an antimony content greater than about 0.70 weight percent, a uniform mixture of starting raw materials is fired with already fired phosphor of the desired alkaline earth halophosphate so that the already fired phosphor is refired in an inert atmosphere containing volatile species from the uniform mixture of starting raw materials.