Polycrystalline gamma-plutonium’s elastic moduli versus temperature
Crystal structure of , viewed perspectively along , with origin chosen as . Cell shows Fddd-space-group (centrosymmetric, no. 70) and contains eight atoms with identical Wyckoff symmetry. At ambient pressure, no other metallic element shows this space group, a space group that occurs in many compounds.
Part of the resonance frequency spectrum of polycrystalline Pu shown near the low- and high-temperature ends of the -phase region of existence. The dashed line provides a guide to the eye to emphasize the size of the shift of the resonances with temperature.
Resonance frequencies versus temperature. All frequencies show a smooth linear decrease with increasing temperature. These fitted values were used in the computation routine to determine the elastic moduli.
RMS error of longitudinal elastic modulus and Chi-square error of shear and longitudinal elastic moduli versus moduli to test for fitting and isotropy errors. Note: RMS error has the same value for shear and longitudinal moduli.
Temperature dependence of bulk , shear , and longitudinal elastic moduli of .
Elastic moduli versus temperature of , , and Ga.
Temperature variation of Poisson’s ratio for . The line is a fit of Poisson’s ratio versus temperature. The parameters of the fit are given in the figure.
Poisson’s ratio versus temperature of aluminum: , , Ga, and Ga.
Parameters of the linear fits to the measurements of , , and of the form .
Parameters of the temperature fit for two elastic moduli of and a comparison with those for and Ga-stabilized for the temperature ranges indicated.
Logarithmic temperature derivatives for the elastic moduli of and a comparison with those for and Ga-stabilized for the temperature ranges indicated.
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