Topic
Tantalum capacitor
About: Tantalum capacitor is a research topic. Over the lifetime, 2432 publications have been published within this topic receiving 26709 citations.
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Patent•
07 Apr 2004TL;DR: In this paper, the authors describe a capacitor having a hafnium oxide and aluminum oxide alloyed dielectric layer and a method for fabricating the same, where the upper electrode is formed by alloying the two materials together.
Abstract: The present invention relates to a capacitor having a hafnium oxide and aluminum oxide alloyed dielectric layer and a method for fabricating the same. The capacitor includes: a lower electrode; a dielectric layer formed on the lower electrode; and an upper electrode formed on the dielectric layer, wherein a portion of the dielectric layer contacting one of the lower electrode and the upper electrode is formed by alloying hafnium oxide and aluminum oxide together.
19 citations
Patent•
04 Aug 1988TL;DR: An aluminum foil type solid electrolytic capacitor with a manganese dioxide electrolytic layer between the electrode foils is described in this article, where the layer is formed by decomposing the electrolytic solution thermally under conditions of a temperature between 200 and 260 °C and of a time interval between 20 and 40 minutes.
Abstract: An aluminum foil type solid electrolytic capacitor wherein the distance between the two foils (1,2) in the capacitor element (10) to be determined by the thickness of separator (3) being kept at a value between ten to sixty micrometers, solid electrolyte being formed between the two foils (1,2) by the thermal decomposition of electrolytic solution impregnated in the capacitor element (10). Manufacturing methods of an aluminum foil type solid electrolytic capacitor with a manganese dioxide electrolytic layer (9) between the electrode foils (1, 2), wherein the layer is formed by decomposing the electrolytic solution (8) thermally under conditions of a temperature between 200 and 260 °C and of a time interval between 20 and 40 minutes, wherein the layer (9) is formed by decomposing electrolytic solution (8) with fine powders of manganese dioxide, wherein lithium is doped in the layer or wherein electrochemical conversion processes are used for restoring an aluminum oxide film. Manufacturing methods of a chip type aluminum solid electrolytic capacitor (20), wherein a capacitor element (40, 60, 70) is fixed in a case (21, 41, 63, 73) with resin (42, 64) around the center of the case or wherein one lead (61, 71) of a capacitor (60, 70) element is connected electrically to a metallic case (21, 41, 63, 73) into which the capacitor (60, 70) element is inserted.
19 citations
Patent•
20 Feb 2008
TL;DR: In this article, a solid capacitor is described, which consists of a dielectric layer and two electrodes, and the holes are connected with the outside so as to increase surface area of the layer and further increase the capacity.
Abstract: A solid capacitor and the manufacturing method thereof are disclosed. The solid capacitor consists of a dielectric layer and two electrodes. A plurality of holes formed by an opening process is disposed on surface of the dielectric layer. The two electrodes connect with the dielectric layer by the holes. By means of a plurality of high temperature volatile matters, the plurality of holes is formed on surface of the dielectric layer during sintered process. The holes are connected with the outside so as to increase surface area of the dielectric layer and further the capacity is increased. And the solid capacitor stores charge by physical means. Moreover, the solid capacitor can be stacked repeatedly to become a multilayer capacitor.
19 citations
Patent•
14 Nov 2002
TL;DR: In this paper, a water-based electrolyte was used in a hybrid-type capacitor, which has an electrolytic anode and an electrochemical cathode without generating gassing.
Abstract: The present invention is directed to a water based electrolyte used in a hybrid-type capacitor. The hybrid-type capacitor has an electrolytic anode and an electrochemical cathode. The difference resides in the electrolyte for this type of capacitor. The electrolyte has water, a water soluble inorganic and/or organic acid and/or salt, and a water soluble nitro-aromatic compound. Such a hybrid capacitor (1) improves energy density by significantly reducing volume of the separator and cathod material often used in conventional electrolytic capacitors and (2) has an electrochemical cathode that undergoes an electrochemical reduction without generating gassing. For example, ruthenium oxide, RuO2, is reduced to ruthenium hydroxide, Ru(OH)2, when passing a cathodic current. However, the present invention discovered that without the present electrolyte, the RuO2 cathode does generate gassing if it is sufficiently depleted. The gassing degrades capacitor performance and even casuse failure, which is decreased with the present electrolyte solution.
19 citations
TL;DR: In this article, a multilayer ceramic capacitors based on PMN-PZT solid solutions have been prepared using a 70 % Ag-30% Pd alloy as internal electrode.
Abstract: Multilayer ceramic capacitors based on PMN-PZT solid solutions have been prepared using a 70 % Ag-30% Pd alloy as internal electrode. Some interaction of the electrode-dielectric with Ag+ diffusion into the dielectric was observed. The Ag+ diffusion influenced the normal microstructural development present in the PMN-PZT ceramics. In spite of this, the dielectric behaviour of a five active layers capacitor sintered at 1050 °C for 2 h in air showed a capacitance of 120 nF, an effective dielectric constant maximum of ~200 000 and dielectric losses of about 3% near room temperature and 1 kHz.
19 citations