Abstract
The velocity of a surface acoustic wave (SAW) on the surface of Ti-diffused ZY-LiNbO3 is studied experimentally. A negative velocity-change maximum is observed on Ti-diffused +ZY-LiNbO3. The value of this change and the corresponding frequency depend on the diffusion conditions. Under certain diffusion conditions, the maximum negative velocity change appears at a frequency of less than 100 MHz, and its value reaches 5%, which is much larger than that of YZ-LiNbO3. As the frequency increases, the velocity change varies gradually from negative to positive values. However, the anomalous velocity change is not observed on Ti-diffused −ZY-LiNbO3. A plausible explanation for the anomalous velocity change on Ti-diffused +ZY-LiNbO3 is that an inversion layer of ferroelectric domains is formed by the diffusion of Ti into +ZY-LiNbO3.
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