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Measurement of Atomic Elastic Constants by Pulsed Neutron Powder Diffraction

  • A. C. Lawson (a1), G. H. Kwei (a1), J. A. Goldstone (a1), B. Cort (a1), R. I. Sheldon (a1), E. Foltyn (a1), J. Vaninetti (a1), D. T. Eash (a1), R. J. Martinez (a1) and J. I. Archuleta (a1)...

Abstract

We have developed a technique for determining the atomic elastic constants from measurements of the Debye-Waller factors. The Debye-Waller factors are obtained by Rietveld refinement of time-of-flight neutron diffraction data and interpreted in terms of an atomic Debye-Waller temperature. The method is applicable to powders and to materials that must be encapsulated for safety or environmental reasons. We will illustrate our technique with applications to actinide metals, to metallic hydrides and to high-temperature superconductors.

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1 Willis, B. T. M. and Pryor, A. W., “Thermal Vibrations in Crystallography,” Cambridge University Press, London (1975).
2 Grimvall, G., “Thermophysical Properties of Materials,” North-Hoiland, Amsterdam (1986).
3 Von Dreele, R. B., Neutron Powder Diffraction, in “Modern Powder Diffraction,” D. L. Bish and J. E. Post, eds., Mineralogical Society of America, Washington (1989).
4 Larson, A. C. and Von Dreele, R. B. “General Structure Analysis System,” LAUR 86-748, Los Alamos National Laboratory (1986).
5 Lawson, A. C., Williams, A., Goldstone, J. A., Eash, D. T., Martinez, R. J., Archuleta, J. I., Martinez, D, J., Cort, B. and Stevens, M. F., Elastic Properties of Materials by Pulsed Neutron Diffraction, J. less-Common Metals 167: 353 (1991).
6 Lawson, A. C., Goldstone, J. A., Cort, B. and Diebolt, L., Debye-Waller Factors of Plutonium Metal, in: “LANSCE Experiment Reports, 1991 Run Cycle,” Los Alamos National Laboratory (to be published).
7 Goldstone, J. A., Lawson, A. C., Cort, B. and Foltyn, E., Low Temperature Study of Elemental Neptunium, in: “LANSCE Experiment Reports, 1991 Run Cycle,” Los Alamos National Laboratory (to be published).
8 Goldstone, J. A. and Lawson, A. C., Neutron Diffraction Study of Scandium Deuteride at Low Temperature, in: “LANSCE Experiment Reports, 1989 Run Cycle,” LA-11933-PR, Los Alamos National Laboratory (1990).
9 Fisk, Z. and Johnson, D. C., Isotope Effect in the Resistivity of Scandium Hydride, Phys. Lett. 53A:39(1975).
10 Kwei, G. H., Lawson, A. C. and Mostoller, M., Vibrational Properties and Atomic Debye Temperatures for La2CuO4 from Neutron Powder Diffraction, Physica C175: 135 (1991).

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