AN INVESTIGATION OF THE THEORETICAL AND PRACTICAL ASPECTS OF THE THERMAL EXPANSION OF CERAMIC MATERIALS. Quarterly Progress Report, January 1, 1961-March 31, 1961
The thermal expansion coefflcients of 4 members of the homologous series of cubic rare earth oxides were measured, plotted against the openness ratios, and the molar volumes calculated for each oxide. Thermal expansion coefficients appeared to increase with decreasing openness ratio or molar volume in going from Sc/sub 2/O/sub 3/ to the true rare earth oxides, but within the sub-series of true rare earth oxides (Sm/sub 2/O/sub 3/ to Lu/sub 2/O/sub 3/), the expansion coefficient appeared to be nearly constant. Procedures used in estimating the precision and accuracy of expansion coefficient determination by x-ray diffraction were discussed. With Cu radiation, the estimated accuracy for most of the materials of interest is plus or minus 1.3 x 10/sup -7// deg C or less, over the range 25 to 1000 deg C. With Cr radiation, the estimated accuracy is plus or minus 1.4 x 10/sup -7// deg C, over the range 25 to 1200 deg C, and plus or minus 1.7 x 10/sup -7// deg C or less, over the range 25 to 1000 deg C. (auth)
- Research Organization:
- Cornell Aeronautical Lab., Inc., Buffalo
- NSA Number:
- NSA-16-016715
- OSTI ID:
- 4781763
- Report Number(s):
- CAL-PI-1273-M-10; AD-264974
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM
COPPER
DIFFRACTION
EFFICIENCY
ELECTRONICS
EXPANSION
GUIDANCE
HIGH TEMPERATURE
LATTICES
LUTETIUM OXIDES
MEASURED VALUES
MECHANICAL PROPERTIES
METALS, CERAMICS, AND OTHER MATERIALS
MOLECULES
NIOBIUM
NUMERICALS
OXIDES
RADIATIONS
RARE EARTHS
RE-ENTRY
REACTORS
REFRACTORIES
SAMARIUM OXIDES
SCANDIUM OXIDES
TABLES
TANTALUM
TEMPERATURE
USES
VOLUME
X RADIATION
ZIRCONIUM