Porcelain composition for varistor and varistor
AssigneeMurata Manufacturing Co., Ltd.
InventorsSakyo Hirose, Akinori Nakayama, Kousuke Shiratsuyu
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Abstract
A varistor is provided which can be driven at a low voltage, has a small leak current, and can realize a high ESD resistance and a high surge resistance. The varistor is formed using a ceramic composition for a varistor which contains zinc oxide as a primary component and sub-components including praseodymium at a content of 0.05 to 3.0 atomic percent of the total, cobalt at a content of 0.5 to 10 atom percent of the total, at least one of potassium, sodium, and lithium at a total content of 0.005 to 0.5 atom percent of the total, at least one of aluminum, gallium, and indium at a total content of 2×10−5 to 0.5 atom percent of the total, and zirconium at a content of 0.005 to 5.0 atom percent of the total.
Claims19
A ceramic composition utilizable to form a varistor, comprising:
- zinc oxide as a primary component;
- and sub-components comprising praseodymium at a content of 0.05 to 3.0 atomic percent of the total, cobalt at a content of 0.5 to 10 atom percent of the total, at least one of potassium, sodium and lithium at a total content of 0.005 to 0.5 atom percent of the total, at least one of aluminum, gallium and indium at a total content of 2×10−5 to 0.5 atom percent of the total, and zirconium at a content of 0.1 to 5.0 atom percent of the total.
A varistor comprising a sintered body of sintered ceramic composition and a plurality of terminal electrodes on exterior surfaces of the sintered body, the ceramic composition sintered comprising zinc oxide as a primary component and sub-components which comprise praseodymium at a content of 0.05 to 3.0 atomic percent of the total, cobalt at a content of 0.5 to 10 atom percent of the total, at least one of potassium, sodium and lithium at a total content of 0.005 to 0.5 atom percent of the total, at least one of aluminum, gallium and indium at a total content of 2×10−5 to 0.5 atom percent of the total, and zirconium at a content of 0.1 to 5.0 atom percent of the total.
Dependencies are inferred from the claim text.