Processing and electromechanical properties of (Bi0.5Na0.5)(1-1.5x)LaxTiO 3 ceramics

Aree Herabut, Ahmad Safari

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Abstract

Bismuth sodium titanate (Bi0.5Na0.5TiO3, BNT) with 0-6 at. % lanthanum was prepared by the conventional mixed oxide method. Each composition was calcined at 800-900°C for 2-5 h to form a pure perovskite phase. Green pellets were sintered at 1050-1150°C for 1-4 h to obtain dense ceramics with at least 95% of theoretical density. X-ray diffraction (XRD) showed phase distortion as lanthanum was added to this system. Meanwhile, a small amount of La was found to affect the grain size and had an influence on the poling conditions and electrical properties. The BNT-based composition with 1 at.% La doping provided a dielectric constant (K) of 560, a piezoelectric charge constant (d33) of 92 pC/N, and a hydrostatic piezoelectric coefficient (dh) of 72 pC/N.

Original languageEnglish (US)
Pages (from-to)2954-2958
Number of pages5
JournalJournal of the American Ceramic Society
Volume80
Issue number11
DOIs
StatePublished - Jan 1 1997

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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