Synthesis of piezoelectric lead zirconate titanate
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Synthesis of Piezoelectric Lead Zirconate Titanate. Billy Woodford DREAM-REU Advisor: Dr. Wei-Heng Shih Mentor: Huidong Li. Outline. Background Intended Research Work To Date Future Work. Piezoelectricity.

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Synthesis of piezoelectric lead zirconate titanate

Synthesis of Piezoelectric Lead Zirconate Titanate

Billy Woodford

DREAM-REU

Advisor: Dr. Wei-Heng Shih

Mentor: Huidong Li


Outline
Outline

  • Background

  • Intended Research

  • Work To Date

  • Future Work


Piezoelectricity
Piezoelectricity

  • “Piezoelectricity is the ability of certain crystals to generate a voltage in response to applied mechanical stress1”

    1:http://en.wikipedia.org/wiki/Piezoelectric

  • Noncentrosymmetric structure makes this piezoelectric

  • d33 relates applied force to voltage along the parallel axis.

http://www.physikinstrumente.de


Background
Background

PZT is a ceramic which can exhibit piezoelectric properties

  • Conventional Synthesis Method:

  • Applications of piezoelectrics include:

    • High-voltage sources

    • Sensors

    • Actuators

    • Frequency Standards

    • Piezoelectric Motors

PbO + xZrO2 + (1-x)TiO2 Pb(ZrxTi1-x)O3


Intended research
Intended Research

  • Examine existing synthesis procedures

  • Develop new method of synthesis to promote more intimate mixing

  • Compare PZT samples synthesized by each method

  • Use best-possible PZT to tape-cast free standing thick-films, then characterize




Properties of interest
Properties of Interest

  • Density

    • Bulk, Apparent, Relative

  • Dielectric Properties

    • Dielectric Constant, Dielectric Loss

  • Piezoelectric Properties

    • d33 Constant


Washed vs unwashed
Washed vs. Unwashed

  • Washing found to:

    • Decrease density;

    • Decrease dielectric constant;

    • Decrease d33 constant;

    • Promote Pyrrochlore phase impurity

Top: Unwashed Samples

Bottom: Washed Samples


Density comparison
Density Comparison

Theoretical Density of perovskite PZT is 7.9 g/cm3


Future work
Future Work

  • Determine heat treatment for Method 3 procedure using Thermal Gravometric Analysis (TGA)

  • Compare properties across synthesis methods and sintering temperatures

  • Develop a procedure to tape-cast freestanding thick-film PZT


Acknowledgements
Acknowledgements

  • Dr. Wei-Heng Shih

  • Huidong Li

  • DREAM-REU

  • Ceramics Processing and Sensor Group


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