Giant strain response with low hysteresis in potassium sodium niobate based lead-free ceramics

Lixiang Yu, Hao Xi, Zhenglei Yu, Yunfei Liu, Yinong Lyu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

In this work, the relationships between the composition-driven phase boundary, ferroelectricity and strain properties of the (1-x)(K0.48Na0.52)(Nb1-ySby)O3-xBi0.5(Na0.82K0.18)0.5ZrO3 (abbreviated as (1-x)KNN1-ySy-xBNKZ) ceramics were investigated. A giant electric field-induced strain of 0.3% (d33 = 750 p.m./V) and a low hysteresis (16.4%) were obtained in the 0.97KNN0.98S0.02-0.03BNKZ ceramics. The giant strain is attributed to the enhanced piezoelectricity induced by the appearance of the O-T phase boundary and the electric-field-induced phase transition from the relaxor phase to the ferroelectric phase. Furthermore, the 0.97KNN0.98S0.02-0.03BNKZ ceramics exhibit good thermal stability in the temperature range from 25 °C to 150 °C. Hence, this work can promote the practical applications of KNN-based lead-free piezoelectric ceramics in highly sensitive and precise piezoelectric actuators.

Original languageEnglish
Pages (from-to)14675-14683
Number of pages9
JournalCeramics International
Volume45
Issue number12
DOIs
StatePublished - 15 Aug 2019

Keywords

  • Giant strain
  • Low hysteresis
  • Potassium-sodium niobate
  • Thermal stability

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