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Processing–Property Relations in Grain-Oriented Lead Metaniobate Ceramics Fabricated by Layered Manufacturing

Authors

  • Nader Marandian Hagh,

    Corresponding author
    1. Department of Ceramic and Materials Engineering, Rutgers University, Piscataway, New Jersey 08854
      †Author to whom correspondence should be addressed. e-mail: znmhagh@rci.rutgers.edu
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    • *Member, American Ceramic Society.

  • Kazuhiro Nonaka,

    1. Department of Ceramic and Materials Engineering, Rutgers University, Piscataway, New Jersey 08854
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    • Present address: National Institute of Advanced Industrial Science and Technology (AIST), Kyushu 807-1 Shuku-machi, Tosu, Saga 841-0052, Japan.

  • Mehdi Allahverdi,

    1. Department of Ceramic and Materials Engineering, Rutgers University, Piscataway, New Jersey 08854
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    • *Member, American Ceramic Society.

  • Ahmad Safari

    1. Department of Ceramic and Materials Engineering, Rutgers University, Piscataway, New Jersey 08854
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    • *Member, American Ceramic Society.


  • D. Damjanovic—contributing editor

  • Supported by ONR under project No. N00014-00-1-0626 and Howatt Foundation.

†Author to whom correspondence should be addressed. e-mail: znmhagh@rci.rutgers.edu

Abstract

Highly grain-oriented lead metaniobate (PbNb2O6; PN) ceramics were prepared by a layered manufacturing (LM) process. This process has enabled us to obtain a net-shaped piezoelectric ceramic component with grain orientation of f∼89%, and improvement in electromechanical properties. The LM feedstock (filament) includes equiaxed (matrix; 90 vol%) and anisometric PN templates (10 vol%), both dispersed uniformly in a thermoplastic binder. The needle-like PN templates were synthesized by molten salt synthesis technique, while the equiaxed PN powder was prepared by conventional ceramic processing methods. The processing conditions were studied and optimized to obtain orthorhombic phase fine powder and anisometric templates.

Samples were obtained through layer-by-layer deposition of the filament through a small diameter (500 μm) nozzle. After binder removal, the PN samples were sintered in a temperature range of 1150°–1300°C for 1 h. SEM observation revealed strong grain orientation perpendicular to the deposition direction. Relative permittivity at the Curie point (Tc: 560°C) was 18 100 and 14 600 for the LM and random polycrystalline samples, respectively. Improved properties in piezoelectric figure of merit by 71%, d33 by 23%, and g33 by 31% were observed in the grain-oriented samples. Remnant polarization also showed about 80% improvement, increasing from 4.5 to 8.1 μC/cm2 for the grain-oriented LM samples.

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