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Phase transition-induced high electromechanical activity in [(K0.5Na0.5)1− xLix](Nb0.8Ta0.2)O3lead-free ceramic system

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
480
Issue
2
Identifiers
DOI: 10.1016/j.jallcom.2009.01.111
Keywords
  • Electromechanical Activity
  • Lead-Free Ceramics
  • Morphotropic Phase Boundary (Mpb)
  • Phase Transition

Abstract

Abstract A high electromechanical activity is observed in the [(K 0.5Na 0.5) 1− x Li x ](Nb 0.8Ta 0.2)O 3 ( x = 0, 0.02, and 0.03) lead-free ceramic system at and around the orthorhombic ( O)–tetragonal ( T) phase transition temperature ( T O– T ). This activity is found to originate from an O– T phase transition region at ambient temperature rather than a classical morphotropic phase boundary (MPB) region intrinsic in the Pb(Zr 1− x Ti x )O 3 (PZT) lead-based ceramic system. Li modification enables a large decrease in T O– T instead of constituting a classical MPB. In contrast to the nearly temperature-independent classical MPB behavior in the PZT system, the strong temperature-dependent phase transition behavior in the system may impose a challenge to temperature demanding applications.

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