Acoustical measurement of solid state non-linearity: Application to CsCdF3 and KZnF3 |
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| Authors: | M.A. Breazeale J. Philip A. Zarembowitch M. Fischer Y. Gesland |
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| Affiliation: | Department of Physics, The University of Tennessee, Knoxville, Tennessee 37996-1200, U.S.A.;University of Paris VI, Paris, France;University of Maine, Le Mans, France |
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| Abstract: | ![]()
Combination of the results of two sets of measurements on the same crystalline samples of CsCdF3 and KZnF3 has made possible the evaluation of the third-order elastic (TOE) constants of these two fluoroperovskites. In the first technique the hydrostatic pressure dependence of the velocity of ultrasonic waves of different propagation and polarization directions has been measured to determine three linear combinations of TOE constants. In the second technique the fundamental and the second harmonic amplitudes of an initially sinusoidal longitudinal ultrasonic wave of finite amplitude propagating along the principal directions have been measured to determine three other linear combinations. Combination of the two sets of data leads to the following room temperature values of the TOE constants (in units of 1012 dynes/cm2): | Sample | C111 | C112 | C114 | C166 | C123 | C456 | | CsCdF3 | ?13·2 | ?4·55 | ?3·12 | ?0·69 | +2·6 | ?3·8 | | KZnF3 | ?16·6 | ?4·75 | ?0·52 | ?1·79 | +3·2 | ?6·87 |
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