K 0.44,Na 0.52,Li 0.04)(Nb 0.84,Ta 0.10,Sb 0.06)O 3 ferroelectric ceramics

Ahmad Safari, Maryam Abazari, Kian Kerman, Nader Marandian-Hagh, E. Koray Akdoǧan

Research output: Contribution to journalArticle

18 Scopus citations


Recent progress in (K 0.44,Na 0.52,Li 0.04)O 3-based ceramics (KNN) with special emphasis on (K 0.44,Na 0.52,Li 0.04) (Nb 0.84, Ta 0.10,Sb 0.06)O 3 (KNN-LT-LS) is reviewed concisely. The base KNN and its compositional derivatives are analyzed in terms of dopant-property relationships, which are then extended to the ternary derivatives. The effects of processing conditions such as humidity, precursor purity, and oxygen partial pressure during sintering are elaborated on from a phenomenological perspective. It is also shown that the spontaneous polarization is sensitive to the processing route chosen for synthesis (mixed oxide versus perovskite routes). Special attention is devoted to the discussion of the morphotropic phase boundary (MPB) dilemma in the KNN-LT-LS system, where it is shown that the origin of high piezoelectric activity is actually due to a polymorphic transition at room temperature. It is shown that prototype transducers based on pure and 1 mol% Ba 2+ doped KNN-LT-LS exhibit performance metrics comparable to those fabricated using PZT-5H. Overall, KNN- LT-LS ceramics show great promise for lead-free applications, although issues such as temperature dependence of properties and strong sensitivity to processing conditions remain as the 2 major challenges.

Original languageEnglish (US)
Article number5183585
Pages (from-to)1586-1594
Number of pages9
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Issue number8
StatePublished - Aug 1 2009

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Electrical and Electronic Engineering
  • Acoustics and Ultrasonics

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