Research And Development Services Leading To The Control Of Electrical Properties Of Materials For High Temperature Radomes

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Report Number: WADC TR 59-300 Part II
Author(s): Atlas, Leon M., Nagao, Hikaru
Corporate Author(s): Armour Research Foundation
Laboratory: Materials Central
Date of Publication: 1960-10
Pages: 42
Contract: AF 33(616)-5929
DoD Project: 7371
DoD Task: 73710
PB Number: PB163019
Identifier: AD0249785
AD Number: AD-249 785

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.

Provenance: Lockheed Martin Missiles & Fire Control

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