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An ultrasonic interferometer for high-pressure research

Ahrens, Thomas J. and Katz, Samuel (1962) An ultrasonic interferometer for high-pressure research. Journal of Geophysical Research, 67 (7). pp. 2935-2944. ISSN 0148-0227. doi:10.1029/JZ067i007p02935.

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A new method in which ultrasonic interferometry is used to measure the pressure dependence of elastic constants and the density of solids has been applied to polycrystalline KCl to pressures of 36 kilobars. Simultaneous measurement of longitudinal and transverse wave velocities in a specimen of initial thickness of approximately 0.2 mm, compressed between two tungsten carbide anvils, yields the adiabatic pressure derivative of density, which is numerically integrated to give the pressure-density relation, permitting direct comparison with Bridgman's data. Densities obtained by the present method are within 0.7 per cent of Bridgman's throughout the pressure range studied. The 19.7-kb phase transition of KCl is marked by a 6 and 12 per cent increase in bulk and shear moduli, the former in good agreement with Bridgman. Extension of the present method to higher pressures and high temperatures and to a variety of materials appears feasible.

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Additional Information:Copyright 1962 by the American Geophysical Union. (Manuscript received March 3, 1962; revised April 10, 1962.) D. L. Arenberg, H. J. McSkimin, and D. G. Gisser, provided assistance in the design of the electronic circuitry. T. E. Davidson helped in the design of the pressure cell which was constructed by C. T. Premo. G. Lehmberg assisted in gathering data and performing calculations. The opportunity extended by Professor Francis Birch of carrying out some of the initial experiments at the Dunbar Laboratory, Harvard University, is gratefully acknowledged. This research was supported in part by the National Science Foundation under grants G-5240 and G-9374, the National Aeronautics and Space Administration under grant NsG-100-60, and the Research Grants Committee of Rensselaer Polytechnic Institute.
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Rensselaer Polytechnic Institute, Research Grants CommitteeUNSPECIFIED
Issue or Number:7
Record Number:CaltechAUTHORS:20141110-112952333
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Official Citation:Ahrens, T. J., and S. Katz (1962), An ultrasonic interferometer for high-pressure research, J. Geophys. Res., 67(7), 2935–2944, doi:10.1029/JZ067i007p02935.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51507
Deposited By: George Porter
Deposited On:10 Nov 2014 20:42
Last Modified:10 Nov 2021 19:12

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