Abstract: A method for producing a capacitor which includes, as one electrode, an electrical conductor having formed on the surface thereof a dielectric layer and, as the other electrode, a semiconductor layer, the method including producing fine electrically defective portions in the dielectric layer and forming the semiconductor layer on the dielectric layer by electrification. The capacitor obtained by the method of the present invention has good capacitance appearance factor, low ESR and is excellent in reliability.

Abstract: The present invention relates to a chip solid electrolyte capacitor obtained by connecting a part of the anode part and a part of the cathode part of a capacitor element to an anode terminal and a cathode terminal, respectively, and jacket-molding the capacitor element excluding a part or the whole of respective bottom faces or bottom and side faces of the anode and cathode terminals, wherein the connection face of the cathode terminal to the capacitor element is larger than the entire face of the capacitor element in the side connected to the cathode terminal, having large capacitance and low equivalent series resistance (ESR); a production method of the capacitor and an electronic device using the capacitor.

Abstract: A process for producing a niobium capacitor, including a step of exposing the dielectric oxide layer to a temperature of 100 to 1,400° C. is disclosed. A capacitor obtained by the production process of the present invention has excellent LC properties, and the reduction in the capacitance due to application of DC bias is small.

Abstract: A sintered body electrode for a sintered body electrode capacitor, which enables to produce a solid electrolytic capacitor having a good capacitance appearance factor, comprising at least one member selected from an earth-acid metal, an alloy mainly comprising an earth-acid metal, an electrically conducting oxide of an earth-acid metal, and a mixture of tow or more thereof, wherein the value (pseudo-closed porosity) obtained by dividing the difference between the volume of a sintered body measured under atmospheric pressure and the volume measured in a vacuum, which are determined according to the Archimedes method, by the volume measured under atmospheric pressure is 11% or less, and a solid electrolytic element using the sintered body, a solid electrolytic capacitor using the element and use of the solid electrolytic capacitor.

Abstract: The invention relates to a process for producing a solid electrolytic capacitor element, comprising forming a semiconductor layer containing a conductive polymer on a conductor having a dielectric layer on its surface. By using the solid electrolytic capacitor element of the invention prepared by forming a semiconductor layer on the conductor having a dielectric layer on its surface by an electrification method after the conductor is impregnated with a dopant, a solid electrolytic capacitor having a favorable ESR value can be fabricated.

Abstract: A chip solid electrolyte capacitor with low ESR and small initial failure ratio comprising a plurality of solid electrolyte capacitor elements each produced by stacking a dielectric oxide film layer, a semiconductor layer and an electrically conducting layer in this order to form a cathode part on a surface of an anode substrate exclusive of the anode part at one end, the anode substrate comprising a sintered body of a valve-acting metal or an electrically conducting oxide or comprising the sintered body connected with a metal wire, which is a chip solid electrolyte capacitor obtained by horizontally laying the plurality of electrolyte capacitor elements in parallel with no space on a pair of oppositely disposed end parts of a lead frame such that the anode part or the metal wire and the cathode part come into contact with the lead frame, joining each element, and molding the entire with a resin while leaving outside the external terminal parts of the lead frame, wherein the volume ratio of one sintered body

Abstract: An object of the present invention is to provide a niobium sintered body free of reduction in the CV value, a niobium powder for use in the manufacture of the niobium sintered body, and a capacitor using the niobium sintered body. A niobium powder of the present invention has niobium and tantalum, where the tantalum is present in an amount at most of about 700 ppm by mass. A sintered body and a capacitor each is manufactured using the niobium powder.

Abstract: A powder composition for a capacitor comprising a tantalum or niobium and a compound having a silicon-oxygen bond, at least a part of which may be nitrided and which has an average particle size of from 0.1 to 5 ?m; a sintered body using the composition; and a capacitor constituted by the sintered body as one part electrode, and another part electrode. A capacitor favored with high reliability, lower dissipation level of power and smaller deterioration of capacitance than conventional tantalum capacitors using tantalum can be produced by using a sintered body of the powder composition for a capacitor.

Abstract: A capacitor having a tantalum or tantalum alloy electrode as one of the electrodes with an outgoing lead wire composed of a novel niobium alloy. According to the present invention, a capacitor having good heat resistance property can be inexpensively provided without reducing the capacitance.

Abstract: The present invention relates to a reaction vessel for producing a capacitor element, which is used for forming a semiconductor layer by means of energization on two or more electric conductors each having formed on the surface thereof a dielectric layer simultaneously, by immersing the electric conductors into an electrolyte in the reaction vessel, the vessel comprising two or more negative electrode plates corresponding to the individual electric conductors and two or more constant current sources electrically connected to each of the negative electrode plates; production method for a group of capacitor elements using the reaction vessel and a capacitor using the capacitor element. According to the present invention, a large number of capacitors which each uses a semiconductor layer as one part electrode with a narrow appearance capacitance distribution can be obtained simultaneously.

Abstract: In a capacitor comprising a pair of electrodes and a dielectric substance intervening between the two electrodes, one of the electrodes is composed of sintered niobium nitride. Preferably, the dielectric substance is composed of niobium oxide and the electrode other than the electrode composed of sintered niobium nitride is composed of an ingredient selected from electrolytes, organic semiconductors and inorganic semiconductors. This capacitor has good environmental stability and good leak current characteristics.

Abstract: The present invention provides a capacitor wherein increase in the ESR value after a high temperature loading test is mitigated. A capacitor element, comprising an electric conductor having formed on the surface thereof a dielectric layer as one electrode, and a semiconductor layer, carbon layer and electrode layer formed sequentially on the dielectric layer, which capacitor element is characterized in that the carbon layer contains a dopant; a carbon paste as a material of the capacitor element; a capacitor using the capacitor element; and an electronic circuit and an electronic device using the capacitor.

Abstract: A niobium powder for capacitors, which contains niobium monoxide crystal or hexaniobium monoxide crystal; a sintered body thereof; and a capacitor fabricated from the sintered body as one part electrode, a dielectric material formed on the surface of the sintered body, and another part electrode provided on the dielectric material.

Abstract: A niobium powder having a nitrogen content of about 500—about 7,000 ppm by weight, and having a mean particle diameter of at least about 0.2 ?m and less than about 3 ?m. Preferably the niobium powder has a reduced content of impurities. A sintered body of the niobium powder. This sintered body generally has a specific leakage current index of not more than about 400 [pA/(?F·V)]. The capacitor having (i) an electrode composed of the sintered body, (ii) a counter electrode and (iii) a dielectric intervening between the two electrodes exhibits good leakage current characteristics.

Abstract: A niobium powder for a capacitor having a tapping density of 0.5 to 2.5 g/ml, and average particle size of 10 to 1000 ?mum, angle of repose form 10° to 60°, the BET specific surface area from 0.5 to 40 m2/g and a plurity of pore diameter peak tops in the pore distribution, and a producing method therof; (2) a niobium sintered body, which is obtained by sintering the above niobium powder and, having a plurality of pore diameter peak tops in a range of 0.01 ?mum to 500 ?mum, preferably, the peak tops of two peaks among the plurality of pore diameter peak tops having a highest relative intensity are present in the range of 0.2 to 0.7 ?mum and in the range of 0.7 to 3 ?mum, respectively, and a producing method thereof; (3) a capacitor using the above sintered body and a producing method thereof, and (4) an electronic circuit and electronic device using the above capacitor.

Abstract: (1) A niobium powder for a capacitor having a tapping density of 0.5 to 2.5 g/ml, an average particle size of 10 to 1000 ?m, angle of repose from 10° to 60°, the BET specific surface area from 0.5 to 40 m2/g and a plurality of pore diameter peak tops in the pore distribution, and a producing method thereof; (2) a niobium sintered body, which is obtained by sintering the above niobium powder and, having a plurality of pore diameter peak tops in a range of 0.01 ?m to 500 ?m, preferably, the peak tops of two peaks among the plurality of pore diameter peak tops having a highest relative intensity are present in the range of 0.2 to 0.7 ?m and in the range of 0.7 to 3 ?m, respectively, and a producing method thereof; (3) a capacitor using the above sintered body and a producing method thereof; and (4) an electronic circuit and electronic device using the above capacitor.

Abstract: An object of the present invention is to provide an antimony-containing niobium sintered body for a capacitor having a small specific leakage current value, an antimony-containing niobium powder for use in the sintered body, and a capacitor using the sintered body. In the present invention, an antimony-containing niobium powder having an antimony content of preferably about 0.1 to about 10 mol % and an average particle size of preferably about 0.2 to about 5 ?m is used. By using this antimony-containing niobium powder, a sintered body and a capacitor are constructed.

Abstract: The present invention relates to a powdered niobium for a capacitor, characterized in that the content of each of the elements such as iron, nickel, cobalt, silicon, sodium, potassium and magnesium is about 100 ppm by weight or less or that the total content thereof is about 350 ppm by weight or less is used, a sintered body thereof, a sintered body comprising niobium monoxide crystal and/or diniobium mononitride crystal, a capacitor using the sintered body and the production method of the capacitor. A capacitor using the above described niobium sintered body has a large capacity per the unit weight, a good specific leakage current value and excellent high temperature property.

Abstract: A metal foil having a surface roughened by etching, which is made of an alloy having an earth-acid metal, preferably niobium, as a main component. A capacitor having a pair of electrodes and a dielectric material interposed between said pair of electrodes, wherein at least one of the electrodes is made of the above-mentioned metal foil, exhibits good high-frequency characteristics, and can be a small-size capacitor having a large capacitance.

Abstract: The present invention relates to a powdered niobium for a capacitor, characterized in that the content of each of the elements such as iron, nickel, cobalt, silicon, sodium, potassium and magnesium is about 100 ppm by weight or less or that the total content thereof is about 350 ppm by weight or less is used, a sintered body thereof, a sintered body comprising niobium monoxide crystal and/or diniobium mononitride crystal, a capacitor using the sintered body and the production method of the capacitor. A capacitor using the above described niobium sintered body has a large capacity per the unit weight, a good specific leakage current value and excellent high temperature property.