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Title
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Research And Development Services Leading To The Control Of Electrical Properties Of Materials For High Temperature Radomes
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Date
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1960
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Index Abstract
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Not Available
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Photo Quality
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Not Needed
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Report Number
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WADC TR 59-300 Part II
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Creator
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Atlas, Leon M.
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Nagao, Hikaru
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Corporate Author
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Armour Research Foundation
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Laboratory
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Materials Central
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Extent
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42
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Identifier
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AD0249785
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Access Rights
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ASTIA
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Distribution Classification
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1
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Contract
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AF 33(616)-5929
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DoD Project
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7371
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DoD Task
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73710
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DTIC Record Exists
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No
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Distribution Change Authority Correspondence
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ASD LTR
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Report Availability
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Full text available
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Date Issued
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1960-10
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Abstract
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Multiple regression methods show that impurity ions may be grouped in the following order of decreasing effect on the loss tangent of alumina ceramics: Si, Mg, Ti, Ca, Cr and Fe. Activation energies calculated at 500°C and 105 c/s correspond closely with the depth of traps at Si or Ti impurity sites. Polarization peaks in K'' vs frequency curves have been used to estimate the mobility of charge carriers in a-alumina at 11 to 15 cm2/volt sec. A self compensated dielectric containing 10% Ca TiO3 and 90% Al2O3 has been prepared with a constant value of k' between 25 and 250°C.
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PB Number
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PB163019
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AD Number
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AD-249 785
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Index In
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U.S. Government Research Reports, Vol. 38, No. 12, p. S-20
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Index Price
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$4.60
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Provenance
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Lockheed Martin Missiles & Fire Control
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Type
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report
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Format
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1 online resource
WADCTR59-300part02.pdf