Property-processing relationship in lead-free (K, Na, Li) NbO 3-solid solution system

Nader Marandian Hagh, B. Jadidian, A. Safari

Research output: Contribution to journalArticlepeer-review

131 Scopus citations

Abstract

There has been a significant driving force to eliminate the utilization, recycling, and disposal of ferroelectric ceramics with high content of toxic element (Pb). Recently, the ternary system of KNN-LT-LS has proven to be an outstanding lead-free piezoceramic with properties almost comparable to their lead-based counterpart, PZT. This study reports the effect of various processing conditions on the electromechanical properties of (K0.44Na 0.52Li0.04)(Nb0.84Ta0.10Sb 0.06)O3 system. This includes powder processing, humidity, and exposure to oxygen rich environment during sintering. The Perovskite and Mixed-Oxide methods are used to prepare the stoichiometric powders. It will be shown that both processing methods are notably sensitive to the moisture of as received raw materials and the humidity of environment. Optimum results are obtained when the raw materials undergo a pre-heat treatment followed by formulating the desired composition in an inert atmosphere. The highest electromechanical properties are achieved when the ceramics are completely exposed to oxygen with a high flow rate. Sintered at 1150 °C for 1 h with an oxygen flow rate of 180 cm3/min, the KNN-LT-LS ceramics prepared by Perovskite and Mixed-Oxide routes have d 33∈≥∈300 pC/N, εT33 = 1865, tan δ∈=∈0.02, k 33∈=∈0.65.

Original languageEnglish (US)
Pages (from-to)339-346
Number of pages8
JournalJournal of Electroceramics
Volume18
Issue number3-4
DOIs
StatePublished - Aug 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

Keywords

  • Lead-free piezoelectrics
  • Processing-property relationship in ferroelectrics
  • Sodium potassium niobate

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