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Polymorphic phase transition and piezoelectric properties of (Ba1− xCax)(Ti0.9Zr0.1)O3lead-free ceramics

Authors
Journal
Physica B Condensed Matter
0921-4526
Publisher
Elsevier
Publication Date
Volume
405
Issue
21
Identifiers
DOI: 10.1016/j.physb.2010.08.028
Keywords
  • Lead-Free Ceramics
  • Ferroelectrics
  • Dielectrics
  • Phase Transitions

Abstract

Abstract Lead-free (Ba 1− x Ca x )(Ti 0.9Zr 0.1)O 3 ( x=0.12–0.18) (BCZT) ceramics were prepared successfully using a solid-state reaction technique. The polymorphic phase transitions (PPT) from rhombohedral to orthorhombic phase around room temperature were identified in the composition range 0.14< x<0.18. The samples at x=0.16, showing coexistence of rhombohedral and orthorhombic phase, exhibit enhanced piezoelectric and dielectric properties of d 33=328 pC/N, k p=37.6% and ε′=4800. With the increase of Ca content, the polymorphic phase transitions shift to lower temperature and cannot be observed above room temperature at x≥0.18.

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