A New Material for High‐Temperature Lead‐Free Actuators. (14th June 2013)

• Record Type: Journal Article
• Authors: Kursumovic, Ahmed; Defay, Emmanuel; Lee, Oon Jew; Tsai, Chen‐Fong; Bi, Zhenxing; Wang, Haiyan; MacManus‐Driscoll, Judith L.
• Is Part Of: Advanced functional materials. Volume 23:Number 47(2013)
• Page Start: 5881
• Page End: 5886
• Publication Date: 2013-06-14
• Subjects: Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201300899
• Languages: English
• ISSNs: 1616-301X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Unimorph cantilevers are made from 0.5BaTiO₃‐0.5Sm₂O₃ (BTO‐SmO) self‐assembled vertical heteroepitaxial nanocomposite thin films, grown by PLD on (001) SrTiO₃ single crystal substrates. The films remain piezoelectric up to at least 250 °C without losing any actuation. The longitudinal piezoelectric coefficient, <italic>d</italic>₃₃, is ≈45 to 50 pm V⁻¹ measured from room temperature to 250 °C. The transverse piezoelectric coefficient, <italic>d</italic>₃₁, a key parameter of actuator performance, exceeds PZT (Pb_1–xZr_xTiO₃) films at &gt;200 pm V⁻¹. Since the <italic>d</italic>₃₁ coefficient was found to be positive, this opens up exciting new applications opportunities. The possible reasons for <italic>d</italic>₃₁ &gt; 0 are discussed in the light of 3D strain control in the nanocomposites.</p> </abstract>