dc Resistivity in the Nickel and Nickel Zinc Ferrite System

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  • L. G. Van Uitert
    Bell Telephone Laboratories, Inc., Murray Hill Laboratory, Murray Hill, New Jersey

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<jats:p>The dependence of the resistivities of nickel and nickel zinc ferrites prepared from high purity reagents upon composition and firing temperature has been studied.</jats:p> <jats:p>It has been determined that iron deficient nickel zinc ferrites are of much higher resistivity than iron deficient nickel or zinc ferrites.</jats:p> <jats:p>The iron deficient ferrites prepared, which were fired in oxygen below 1300°C and have Ni:Zn ratios greater than 3:7, show a positive thermoelectric voltage. Other compositions or materials fired above 1300°C have a negative thermoelectric voltage.</jats:p> <jats:p>The effect of excess iron upon resistivity is dependent upon the presence or absence of zinc at temperatures below 1300°C.</jats:p>

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