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

Item

Title
Investigation Of The Stoichiometric And Structural Variables Which Affect Conductivity In Ferromagnetic Ceramic Materials For Use In Magnetic Circuits
Description
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.
Date
1961
Index Abstract
Contrails and DTIC truncated
Photo Quality
Incomplete
Report Number
WADD TR 60-421
Creator
Horn, F. H
Corporate Author
General Electric Co Schenectady N Y
Laboratory
Materials Central
Extent
14
Identifier
AD0260988
AD0260988
Access Rights
OTS
Distribution Classification
1
Contract
AF 33(616)-6499
DoD Project
7080
DoD Task
70656
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
None
Report Availability
Full text available by request
Date Issued
1961-01
Abstract
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.
Type
report
Provenance
Lockheed Martin Missiles & Fire Control
Format
iii, 14 pages : ill. ; 28 cm.
Subject
Ferromagnetic Materials
Ceramic Materials
Crystals
Electrical Conductivity
Ferrites
Growth (Physiology)
Iron Compounds
Magnetic Materials
Magnetite
Oxides
Physical Properties
Single Crystals
Thermal Conductivity
Publisher
Wright-Patterson Air Force Base, OH : Wright Air Development Division, Air Research and Development Command, United States Air Force
Distribution Conflict
No