• Lithium tantalate (LiTaO₃) crystals are multifunctional materials exhibiting excellent piezoelectric, ferroelectric, acousto‑optic and electro‑optic effects. They are widely used in resonators, filters, transducers, high‑frequency surface acoustic wave (SAW) devices and bulk acoustic wave devices.
• Specifically, LiTaO₃ is highly desirable for both sonar and optical applications due to its high electromechanical coupling coefficient and low acoustic attenuation. Typical cutting angles for SAW applications include 36° Y‑cut, 42° Y‑cut and X‑cut orientations.
• An innovative technology in LiTaO₃ production involves a reduction process that yields “black” wafers free from pyroelectric discharge, making them ideal for high‑frequency SAW applications.
• To produce these reduced wafers, LiTaO₃ crystals are chemically reduced under a controlled atmosphere. This process effectively eliminates the pyroelectric effect while preserving key material properties such as the Curie temperature and piezoelectric characteristics.
• The resulting black LiTaO₃ wafers not only neutralize electric charges but also exhibit significantly reduced optical transmittance.
• These black LiTaO₃ wafers offer distinct advantages, especially in applications where prevention of pyroelectric discharge and high‑frequency operation are critical. They are essential in advanced SAW devices, contributing to improved performance and reliability across various technical applications.