Resonant Ultrasound Spectroscopy in Small Specimens of Superionic Conductors

(1)共振超声光谱(RUS)技术已被确立为测量快离子导体超声性质的一种强有力的替代方法。通过计算机控制装置和通过GPIB进行数据采集，实现了超声共振频谱的自动测量。采用低Q值的陶瓷换能器精确测量了被测样品的共振响应。(2)对各向同性球形样品的运动方程进行了解析求解，得到了球状和环状模式的频谱。利用其软件确定陶瓷轴承的拉梅常数SIN。(3)编制了晶态样品的Fortran程序，其中根据一组初始弹性常数计算共振频率。RUS方法应用于离子晶体CsPbCl3，但由于材料的脆性，没有进行测量，而是通过核磁共振研究获得了信息。(4)由于本研究项目已经完成了各向同性球形材料的RUS系统，我们正在将该方法应用于作为电池固体电解液的高离子导电玻璃。

(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.