Abstract
Propagation characteristics of surface waves on Ba(Ti0.95Zr0.05)O3 ceramics have been studied under various conditions. The Ba(Ti0.95Zr0.05)O3 ceramic has two second-phase transition temperatures, around 0 and 54 °C, and has a Curie temperature of 96 °C. The attenuation constant for surface wave propagation has a peak value in the vicinity of the phase transition temperature. The logarithmic decrement is nearly independent of frequency over the range 0.8–1.8 MHz. Also, the attenuation is nearly constant for the range of input voltage below 40 V, but increases rapidly beyond 40 V. It is concluded that for the input voltage with small amplitude, the attenuation due to the dielectric loss is predominant, but the attenuation due to the hysteresis mechanism increases for an input voltage above 40 V. Furthermore, it is found that at the second-phase transition temperature, the conversion efficiency of the transducer attains the peak value, while the propagation velocity takes a minimum value.
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