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Materials 2010, 3(12), 5236-5245; doi:10.3390/ma3125236

Review

Piezoelectric Materials Synthesized by the Hydrothermal Method and Their Applications

Takeshi Morita

Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8563, Japan

Received: 14 October 2010; in revised form: 11 November 2010 / Accepted: 30 November 2010 / Published: 9 December 2010

(This article belongs to the Special Issue Advances in Ferroelectric & Piezoelectric Materials)

Download PDF Full-Text [526 KB, uploaded 9 December 2010 16:04 CET]

Abstract: Synthesis by the hydrothermal method has various advantages, including low reaction temperature, three-dimensional substrate availability, and automatic polarization alignment during the process. In this review, powder synthesis, the fabrication of piezoelectric thin films, and their applications are introduced. A polycrystalline lead zirconate titanate (PZT) thin film was applied to a micro ultrasonic motor, and an epitaxial lead titanate (PbTiO₃) thin film was estimated as a ferroelectric data storage medium. Ferroelectric and piezoelectric properties were successfully obtained for epitaxial PbTiO₃ films. As lead-free piezoelectric powders, KNbO₃ and NaNbO₃ powders were synthesized by the hydrothermal method and sintered together to form (K,Na)NbO₃ ceramics, from which reasonable piezoelectric performance was achieved.

Keywords: hydrothermal method; PZT thin film; lead titanate; epitaxial film; lead-free piezoelectric ceramics

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