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

Item

Title
Research And Development Services Leading To The Control Of Electrical Properties Of Materials For High Temperature Radomes
Date
1960
Index Abstract
Not Available
Photo Quality
Not Needed
Report Number
WADC TR 59-300 Part II
Creator
Atlas, Leon M.
Nagao, Hikaru
Corporate Author
Armour Research Foundation
Laboratory
Materials Central
Extent
42
Identifier
AD0249785
Access Rights
ASTIA
Distribution Classification
1
Contract
AF 33(616)-5929
DoD Project
7371
DoD Task
73710
DTIC Record Exists
No
Distribution Change Authority Correspondence
ASD LTR
Report Availability
Full text available
Date Issued
1960-10
Abstract
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.
PB Number
PB163019
AD Number
AD-249 785
Index In
U.S. Government Research Reports, Vol. 38, No. 12, p. S-20
Index Price
$4.60
Provenance
Lockheed Martin Missiles & Fire Control
Type
report
Format
1 online resource