摘要:
A monolithic semiconducting ceramic electronic component includes barium titanate-based semiconducting ceramic layers and internal electrode layers alternately deposited, and external electrodes electrically connected to the internal electrode layers. The semiconducting ceramic layers contain ceramic particles having an average particle size of about 1 &mgr;m or less and the average number of ceramic particles per layer in the direction perpendicular to the semiconductor layers is about 10 or more. The internal electrode layers are preferably composed of a nickel-based metal.
摘要:
The present invention provides barium titanate semiconductive ceramic having low specific resistance at room temperature and high withstand voltage, which fully satisfies the demand for enhancing withstand voltage. The average ceramic grain size of the barium titanate semiconductive ceramic is controlled to about 0.9 &mgr;m or less. By this control, the ceramic possesses low specific resistance at room temperature and high withstand voltage fully satisfying a recent demand for enhancing withstand voltage and may suitably used for applications such as controlling temperature and limiting current, or in exothermic devices for constant temperature. Accordingly, the barium titanate semiconductive ceramic enables an apparatus using the same to have enhanced performance and reduced size.
摘要:
A laminate type semiconductor ceramic capacitor with a varistor function is achieved which allows for an improvement in product yield while ensuring such insulation performance that can withstand practical use, and is suitable for mass production with a favorable ESD withstanding voltage. The semiconductor ceramic forming the semiconductor ceramic layers has a compounding molar ratio m between the Sr site and the Ti site of 0.990≦m
摘要:
A semiconductor ceramic comprising a donor element within the range of 0.8 to 2.0 mol relative to 100 mol of Ti element contained as a solid solution with crystal grains, a first acceptor element in an amount less than the amount of the donor element is contained as a solid solution with the crystal grains, a second acceptor element within the range of 0.3 to 1.0 mol relative to 100 mol of a Ti element is present in crystal grain boundaries, and the average grain size of the crystal grains is 1.0 μm or less. A monolithic semiconductor ceramic capacitor is obtained by using this semiconductor ceramic. To form the semiconductor ceramic, in a first firing treatment to conduct reduction firing, a cooling treatment is conducted while the oxygen partial pressure at the time of starting the cooling is set at 1.0×104 times or more the oxygen partial pressure in the firing process. In this manner, a SrTiO3 based grain boundary insulation type semiconductor ceramic having a large apparent relative dielectric constant ∈rAPP of 5,000 or more and a large resistivity log ρ (ρ: Ω·cm) of 10 or more even when crystal grains are made fine to have an average grain size of 1.0 μm or less, a monolithic semiconductor ceramic capacitor including the semiconductor ceramic, and methods for manufacturing them are realized.
摘要:
A semiconductor ceramic comprising a donor element within the range of 0.8 to 2.0 mol relative to 100 mol of Ti element contained as a solid solution with crystal grains, a first acceptor element in an amount less than the amount of the donor element is contained as a solid solution with the crystal grains, a second acceptor element within the range of 0.3 to 1.0 mol relative to 100 mol of a Ti element is present in crystal grain boundaries, and the average grain size of the crystal grains is 1.0 μm or less. A monolithic semiconductor ceramic capacitor is obtained by using this semiconductor ceramic. To form the semiconductor ceramic, in a first firing treatment to conduct reduction firing, a cooling treatment is conducted while the oxygen partial pressure at the time of starting the cooling is set at 1.0×104 times or more the oxygen partial pressure in the firing process. In this manner, a SrTiO3 based grain boundary insulation type semiconductor ceramic having a large apparent relative dielectric constant ∈rAPP of 5,000 or more and a large resistivity log ρ (ρ:Ω·cm) of 10 or more even when crystal grains are made fine to have an average grain size of 1.0 μm or less, a monolithic semiconductor ceramic capacitor including the semiconductor ceramic, and methods for manufacturing them are realized.
摘要:
A ceramic electronic component includes a component body having semiconductive ceramic layers and internal electrodes. The semiconductive ceramic layers and the internal electrodes are alternately laminated. The semiconductive ceramic layers have a relative density of about 90% or less and contain no sintering additives. The component body is provided with an external electrode on each side thereof. The ceramic electronic component has a low resistance and a high withstand voltage.
摘要:
The present invention provides a semiconducting ceramic which possesses a dielectric strength of 800 V/mm or more and a specific resistance at room temperature of 100 &OHgr;·cm or less, the specific resistance at room temperature undergoing substantially no time-course change. The semiconducting ceramic is formed of a sintered semiconducting material containing barium titanate, wherein the average grain size of the semiconducting ceramic is about 1.0 &mgr;m or less and the relative spectral intensity ratio represented by BaCO3/BaO, which is determined by XPS at the surface of the ceramic, is 0.5 or less.
摘要:
A monolithic semiconductor ceramic capacitor includes semiconductor ceramic layers made of a semiconductor ceramic having a Sr site and a Ti site. The semiconductor ceramic satisfies the inequality 1.000
摘要:
A BaTiO3-type semiconducting ceramic material which has undergone firing in a reducing atmosphere and re-oxidation, wherein the relative density of the ceramic material after sintering is about 85–90%. A process for producing the semiconducting ceramic material of the present invention and a thermistor containing the semiconducting ceramic material are also disclosed.