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Title:The velocity of sound in solid krypton
Author(s):Kupperman, David Sander
Doctoral Committee Chair(s):Simmons, R.O.
Department / Program:Physics
Subject(s):sound velocity
solid krypton
ultrasonic pulse-echo measurements
Abstract:Ultrasonic pulse-echo measurements have been carried out on specimens of solid krypton prepared in a rigid-tail helium cryostat. Values were obtained from polycrystalline specimens for longitudinal sound waves from 52 to 115 K and transverse sound waves from 95 to 115 K, and from a single crystal for longitudinal sound waves travelling in a nearly (110) direction from 94-114 K. Extrapolations to 0 K of polycrystalline velocities are consistent with previous deductions made from measurements of bulk modulus and heat capacity. The present velocity results are compared with model calculations based on m-6 Mie-Lennard~Jones pair potentials but there is only fair agreement. The adiabatic bulk modulus was obtained from the longitudinal and transverse polycrystalline velocities. The agreement between the model calculations and experimental values of the bulk modulus is again only fair. From. the:present bulk modulus values, the Gruneisen parameter of solid krypton was evaluated. From the longitudinal velocity in the nearly (110) direction and the polycrystalline velocities the second-order elastic constants were determined at 114 K. The difference c12 - c44 was also estimated at temperatures 0 K and near the triple point. From the difference between the present "lattice" compressibility results and other measurements of the "bulk" isothermal compressibility, the thermal vacancy concentration in solid krypton has been determined. The agreement with previous measurements of vacancies by direct means is good. An examination of all the data now available for solid krypton indicates that no single existing model describes successfully both the high and low temperature thermoelastic properties of this substance.
Issue Date:1970
Genre:Dissertation / Thesis
Rights Information:1970 David Sander Kupperman
Date Available in IDEALS:2011-07-27
Identifier in Online Catalog:6050638

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