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Investigation of high Curie temperature (1−x)BiSc1−yFeyO3–xPbTiO3 piezoelectric ceramics

J. Appl. Phys. 106, 084107 (2009); doi:10.1063/1.3253585

Published 29 October 2009

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I. Sterianou,1 D. C. Sinclair,1 I. M. Reaney,1 T. P. Comyn,2 and A. J. Bell2
1Department of Engineering Materials, The University of Sheffield, Sheffield S1 3JD, United Kingdom
2Institute for Materials Research, University of Leeds, Leeds LS2 9JT, United Kingdom
Ceramics around the morphotropic phase boundary (MPB) in the (1−x)BiSc1−yFeyO3–xPbTiO3 solid solution were fabricated. For y=0.5, ceramics were single phase, and piezoelectric coefficients (d33) and electromechanical coupling coefficients (kp) for MPB compositions were 300 pC/N and 0.49, respectively; a level of piezoelectric activity similar to that of hard, lead zirconate titanate compositions but with TC~60 °C higher at ~440 °C. For ceramics with y>=0.7, dielectric measurements in combination with diffraction contrast transmission electron microscopy revealed the existence of two ferroelectric phases for most PbTiO3 contents studied. The presence of two ferroelectric phases was associated with a decrease in piezoelectric activity and although raw materials costs for y=0.7 and 0.8 with respect to y=0 were significantly lower (less Sc2O3) and TC greater (~500 °C), d33 (~100  pC/N) and kp (0.18) were too low to be commercially useful for actuator applications. ©2009 American Institute of Physics
History: Received 29 May 2008; accepted 26 September 2009; published 29 October 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/084107/1
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KEYWORDS and PACS

Keywords
PACS
  • 81.05.Je
    Ceramics and refractories: fabrication, treatment, testing and analysis
  • 77.84.Dy
    Dielectric, piezoelectric, and ferroelectric niobates, titanates, tantalates, PZT ceramics, etc
  • 77.80.Bh
    Ferroelectric phase transitions and Curie point
  • 77.65.-j
    Piezoelectricity and electromechanical effects
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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