Resonant Ultrasound Spectroscopy in Small Specimens of Superionic Conductors

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(1) A technique of resonant ultrasound spectroscopy (RUS) has been established as a powerful alternative for the measurement of the ultrasonic properties of superionic conductors. The automatic measurement of resonant ultrasound spectrum has become possible by the computer control of the devices and data acquisition through the GPIB.Ceramic transducers with low Q-values were used to obtain accurate measurements of the resonant response of the sample under study.(2) The equation of motion for the isotropic sphere specimen have been solved analytically and the spectra of spheroidal and toroidal modes have been obtained. Its software was used to detemine the Lame's constant of a ceramic bearing, SIN.(3) The Fortran program in which resonance frequencies are calculated from an initial set of elastic constants were made for crystalline sample. The application of RUS method was intended for an ionic crystal, CsPbCL_3. The measurement, however, was not done because of fragility of this material, whereas the information obtained from NMR invetigation was published.(4) Since the RUS system for isotropic sphere materials have been accomplished in this research program, we are applying this method to the superionic conducting glass which is promising material as solid electrolyte of batteries.