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Related Experiment Videos

Recent developments in high curie temperature perovskite single crystals.

Shujun Zhang1, Clive A Randall, Thomas R Shrout

  • 1Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA. soz1@psu.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|August 3, 2005
PubMed
Summary

Investigating relaxor-PT piezoelectric crystals reveals temperature limitations. Novel BiScO3-PbTiO3 crystals offer a wider usable temperature range for transducer applications due to high Curie temperatures and stable electromechanical properties.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Relaxor-piezoelectric single crystals are crucial for transducer applications.
  • Their operational temperature range is often limited by the rhombohedral-to-tetragonal phase transformation temperature (TR-T), which is lower than the Curie temperature (Tc).
  • Previous attempts to extend the temperature range of Pb(Zn1/3Nb2/3)O3--PbTiO3 (PZNT) and Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMNT) crystals through doping were largely unsuccessful.

Purpose of the Study:

  • To investigate the temperature behavior of various relaxor-PT piezoelectric single crystals.
  • To identify materials with improved temperature stability for transducer applications.
  • To explore novel crystal systems for enhanced performance.

Main Methods:

Related Experiment Videos

  • Investigated temperature dependence of piezoelectric properties in different relaxor-PT single crystal systems.
  • Analyzed phase transformation temperatures (TR-T) and Curie temperatures (Tc).
  • Evaluated electromechanical coupling coefficients (k33) as a function of temperature.

    • Main Results:

    • Pb(Yb1/2Nb1/2)O3-PbTiO3 (PYNT) crystals show high Tc (> 330°C) but limited TR-T (~160°C).
    • Novel BiScO3-PbTiO3 single crystals exhibit very high Tcs (> 400°C).
    • BiScO3-PbTiO3 crystals maintain high electromechanical coupling coefficients (k33 > 90%) up to ~350°C, close to their TR-T.

    Conclusions:

    • The operational temperature range of piezoelectric crystals is critically dependent on TR-T.
    • BiScO3-PbTiO3 single crystals demonstrate significant potential for high-temperature transducer applications due to their extended stable operating range.
    • Further research into BiScO3-PbTiO3 system could lead to advanced piezoelectric devices.