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Investigation Of The Stoichiometric And Structural Variables Which Affect Conductivity In Ferromagnetic Ceramic Materials For Use In Magnetic Circuits

Report Number: WADD TR 60-421
Author: Horn, F. H
Corporate Author: General Electric Co Schenectady N Y
Laboratory: Materials Central
Date of Publication: 1961-01
Pages: 14
Contract: AF 33(616)-6499
Project: 7080
Task: 70656
AD Number: AD0260988

This report deals with the development of the Czochralski method to growing single crystal iron ferrites of the high purity and crystalline soundness necessary to make progress in studies directed toward understanding the electrical properties of ferrites. Only reflectivity peaks have been observed from studies of the optical reflectivity and transmission of magnetite. Resistivity and thermoelectric power as a function of temperature are reported for magnetite. Hall effect studies are inconclusive. Discrepancies between previous data and those obtained here are noted. The thermal conductivity of magnetite has been measured as a function of temperature. The room temperature value is about 70 milliwatts, and an abrupt change is noted at the 120°K transition.

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