ELASTIC CONSTANTS OF THORIUM SINGLE CRYSTALS IN THE RANGE 77-400 K

Journal Article · Thu Jan 01 04:00:00 EST 1959 · Journal of Applied Physics (U.S.)

DOI:https://doi.org/10.1063/1.1734971· OSTI ID:4280837

Armstrong, P E; Carlson, O N; Smith, J F

The elastic constants of thorium single crystals were deterimined at ultrasonic frequencies employing both resonance and pulse-echo techniques. The values at 300 deg K in units of 10/sup 11/ dyne/cm/sup 2/ are, C/sub 11/ =7.53, C/sub 12/= 4.89, and C/sub 44/ = 4.78. The constants C/sub 11/ and C/sub 44/ increase and C/sub 12/ decreases with decreasing temperature and extrapolate to 7.79, 4.82, and 5.13, respectively, at 0 deg K. The Cauchy relation C/sub 12/ = C/sub 44/ occurs, quite probably fortuitously, at 27l deg K. The anisotropy factor 2C/sub 44//(C/sub 11/-C/sub 12/) at room temperature is 3.6 which is comparable to the values for lead and gold. Calculated Poisson's ratios, sigma / sub 100/ and sigma /sub 111/, indicate a much stronger resi stance to contraction in the close-packed planes thin in the less densely packed (l00) planes. (auth)

• Research Organization: Iowa State Coll. Ames
• Sponsoring Organization: USDOE
• NSA Number: NSA-13-004866
• OSTI ID: 4280837
• Journal Information: Journal of Applied Physics (U.S.), Journal Name: Journal of Applied Physics (U.S.) Vol. Vol: 30; ISSN JAPIA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANISOTROPY
CONFIGURATION
CROSS SECTIONS
CRYSTALS
DENSITY
ELASTICITY
ELECTROSTATIC GENERATORS
ENERGY LEVELS
ENERGY RANGE
EQUATIONS
EVAPORATION
EXCITATION
FREQUENCY
GAMMA DETECTION
GAMMA RADIATION
GOLD
HELIUM 4
IMPURITIES
LATTICES
LEAD
MEASURED VALUES
NUCLEAR REACTIONS
NUMERICALS
PHYSICS AND MATHEMATICS
POISSON DISTRIBUTION
PROTON BEAMS
RESONANCE
SODIUM IODIDES
STATISTICS
TARGETS
TEMPERATURE
THALLIUM
THORIUM
TRITIUM
TUNGSTEN
ULTRASONICS
ZIRCONIUM