Abstract
Owing to the low resistivity and small positive temperature coefficient of resistivity around room temperature of the YBa/sub 2/Cu/sub 3/O/sub 7-x/ superconductor, thick film resistor paste is prepared by utilizing YBa/sub 2/Cu/sub 3/O/sub 7-x/ as the functional phase of the resistor. Ag/sub 2/O and PbO are added to increase the density of the fired film and to achieve the resistivity distribution for practical applications. Sheet resistivities ranging from a few ohms per square to several megaohms per square, are obtained by adjusting the contents of YBa/sub 2/Cu/sub 3/O/sub 7-x/, Ag/sub 2/O, and PbO. Large negative temperature coefficients of resistivity are obtained for resistors with higher resistivity values. Since both YBa/sub 2/Cu/sub 3/O/sub 7-x/ and silver exhibit a positive temperature coefficient of resistivity, the negative temperature coefficient of resistivity is thus attributed to the addition of PbO. >
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