The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

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

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

Lockheed Martin Missiles & Fire Control
Download this report

(PDF, 1.72 MB, 42 pages)

Other options for obtaining this report

Via the Defense Technical Information Center (DTIC):
A record for this report, and possibly a full-image download of the report, exists at DTIC

Via National Technical Information Service:
This report may have been digitized and made freely available for public download, or made publicly available for purchase by the National Technical Information Service through their online database, the National Technical Reports Library

Indications of Public Availability
A PB Number, PB163019 , exists for this report, indicating public availability of the report at time of publication

No digital image of an index entry indicating public availability is currently available
There has been no verification of an indication of public availability from an inside cover statement

Related Reports

This report has the following parts/volumes: