Dielectric and piezoelectric properties of PZT ceramics doped with strontium and lanthanum

Kalem V., ÇAM İ., Timucin M.

CERAMICS INTERNATIONAL, vol.37, no.4, pp.1265-1275, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 37 Issue: 4
  • Publication Date: 2011
  • Doi Number: 10.1016/j.ceramint.2010.12.003
  • Journal Name: CERAMICS INTERNATIONAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1265-1275
  • Keywords: Dielectric properties, Piezoelectric properties, PSLZT, ZIRCONATE-TITANATE CERAMICS, ELECTROMECHANICAL PROPERTIES, PLZT CERAMICS, GRAIN-GROWTH, LA, MICROSTRUCTURE, ADDITIVES, BEHAVIOR, SIZE, SR
  • Middle East Technical University Affiliated: Yes

Abstract

PZT based piezoelectric ceramics obtained by doping with various levels of Sr2+ and La3+, designated as PSLZT, were prepared by conventional processing techniques. The effects of Sr2+ and La3+ additions, and that of the Zr/Ti ratio on microstructure, on phase constitution, and on the dielectric and piezoelectric properties were investigated. XRD data revealed that all PSLZT compositions had perovskite structure in which increasing Sr and/or decreasing Zr/Ti ratio increased the tetragonality. In PSLZT ceramics the morphotropic phase boundary (MPB) appeared as regions extending from Zr/Ti ratio of 52/48 to 58/42. Among all compositions studied, the PSLZT ceramic having 5 at% Sr2+ and 1 at% La3+ with a Zr/Ti ratio of 54/46 exhibited a peak piezoelectric strain coefficient of d(33) = 640 pC/N with attending dielectric and electromechanical parameters K-33(T) = 1800, k(p) = 0.56, Q(m) = 70, and tan delta = 1.55%. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.