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Resistor Compositions

IP.com Disclosure Number: IPCOM000096815D
Original Publication Date: 1963-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 42K

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Block, ML: AUTHOR [+2]


This metal glaze resistor composition has a wide range of resistivities and excellent TCR characteristics.

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Resistor Compositions

This metal glaze resistor composition has a wide range of resistivities and excellent TCR characteristics.

The composition is prepared by oxidizing palladium black at 750 degrees C in air for about one hour. The oxidized palladium black is mixed with a preselected number of grams of cupric oxide per 100 grams of palladium oxide. Other forms of copper can be used. The mixture is milled for approximately one hour and fired at about 750 degrees C in air. The resulting palladium oxide doped with copper is combined with other elements to form compositions in the range comprised of 20% copper doped palladium oxide, 20% silver and 60% borosilicate glass or the like. The composition is distributed in an organic vehicle. The solid content of the composition is approximately 80% to facilitate screen deposition. The deposited resistor is fired at about 800 degrees C to form resistor elements having resistivities of the order of 6K ohms per square and TCR of about 75 PPM.

The particular resistivities and TCR for copper doped palladium oxide are shown in the graph.

Although palladium oxide is discussed, the material can be substituted wholly or in part by rhodium oxide. Likewise, although silver has been described, this can be replaced wholly or in part by other noble metals.

Copper II ions fill palladium II vacancies and account for the increase in composition resistivity. This is consistent with charge compensation in semiconducting compounds described...