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Ceramic substrate of Na.sub.2 O and Nb.sub.2 O.sub.5 for magnetic metal thin film

Image Number 3 for United States Patent #4639400.

A ceramic composition particularly useful for use in thin film magnetic heads, the composition having the general formula:wherein the ratio x/y is at least 0.74 but less than 1.00, the composition having a coefficient of thermal expansion closely matching that of the magnetic alloy film with which it is used so as to prevent separation of the two upon changes in temperature.

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