Abstract: A ceramic dielectric composition is provided including 63.96 to 73.72 mole % SrTiO.sub.3, 17.90 to 24.04 mole % TiO.sub.2, and 8.11 to 12.00 mole % Bi.sub.2 O.sub.3 and further including 0 to 8 weight % NiO, 0 to 1.11 weight % La.sub.2 O.sub.3, 0 to 2.94 weight % SiO.sub.2 and 0 to 0.32 weight % MnO. The said weight %, where mentioned, is with respect to the total weight of the above mentioned three compounds, SrTiO.sub.3, TiO.sub.2 and Bi.sub.2 O.sub.3.These ceramic dielectric compositions have high dielectric constants and low dielectric losses (dissipation factors). Also, the variation of dielectric constant and dissipation factor with respect to temperature, applied AC voltage, and applied DC voltage are very small.
Abstract: A mixture of powders of barium titanate, a Curie point shifter and a lead titanate-bismuth titanate metal oxide flux which may be fired in a single step at 1800.degree. F. to 2100.degree. F. to produce a dense ceramic body with high dielectric constant. The ceramic is adapted to monolithic, multilayer ceramic capacitors. The low firing temperature minimizes the requirements of high temperature noble electrode material.
Abstract: A monolithic ceramic capacitor with base metal electrodes fired in an atmosphere of oxygen at low partial pressure in which the reaction between the electrodes and the ceramic prevents conversion of the ceramic into the semiconductive state. The base metal is a transition metal or a transition metal alloy, preferably nickel. The method is usable with any green ceramic without changing the firing temperature. The only change required is from the normal oxygen partial pressure in the kiln open to the atmosphere to an atmosphere of much lower oxygen partial pressure.
Abstract: A monolithic ceramic capacitor having embedded electrodes formed by cosintering of ceramic dielectric layers and layers indifferent to the dielectric layers corresponding in area and position to the electrodes. The indifferent layers are converted to a conductive state, for example, by chemical conversion and used as such or are removed and replaced by metal or conductive material. One example in which the indifferent layers comprise nickel oxide involves stacking layers of green ceramic coated with nickel oxide in the desired electrode pattern, sintering the stacked layers to produce a monolith, reducing the nickel oxide in the monolith to metallic nickel in a hydrogen atmosphere at a temperature low enough to have minimal effect upon the dielectric properties of the ceramic and using the metallic nickel as reduced for the ceramic capacitor electrodes.
Abstract: A monolithic ceramic capacitor with base metal electrodes fired in an atmosphere of oxygen at low partial pressure in which the reaction between the electrodes and the ceramic prevents conversion of the ceramic into the semiconductive state. The base metal is a transition metal or a transition metal alloy, preferably nickel. The method is usable with any green ceramic without changing the firing temperature. The only change required is from the normal oxygen partial pressure in the kiln open to the atmosphere to an atmosphere of much lower oxygen partial pressure.
Abstract: A rotary disc trimmer in which the rotor and stator leads have heads received in the same socket in the stator and are insulated from each other by a disc of insulating material fixed to the head of the rotor terminal and centered on the rotor shaft.
Abstract: A monolithic ceramic capacitor having fritless electrodes of nickel or other base metal particles coated with a precious metal such as platinum. The coating may be very thin and typically applied by electroless plating and/or electroplating. The particles may be used as the sole pigment for the electrodes or the particles may be mixed with other compatible pigments.