Role of oxygen vacancy defects in piezoelectric thermal stability characteristics of Mn-doped (K,Na,Li)NbO3 piezoceramics

Hee Seung Ma, Min Ku Lee, Byung Hoon Kim, Kyu Hyun Park, Jin Ju Park, Sang Hyeop Lee, Yun Gi Jeong, Kwi Il Park, Chang Kyu Jeong, Gyoung Ja Lee

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Piezoelectric thermal stability characteristics of (K,Na,Li)NbO3 ceramics were investigated with a particular focus on the role of oxygen vacancy defects, by excluding the lattice distortion or microstructural effects with the help of a low level of Mn doping (less than 1.0 mol%). Benefiting from the reduction of intrinsic oxygen vacancy defects, controlled Mn doping (0.25 mol%) could achieve excellent ferroelectric/piezoelectric activity and superior thermal aging resistance. Beyond this doping level, however, the defect dipoles combined with extrinsic oxygen vacancies, although advantageous to the hardening effect, deteriorated the piezoelectric thermal stability and aging resistance including room-temperature properties. The thermal dissociation and migration of oxygen-vacancy-associated defect dipoles were considered mainly responsible for negating the ability to restore the initial poled domain state with defect-dipole-induced polarization. Results demonstrated the importance of keeping the intrinsic and extrinsic oxygen vacancy levels as low as possible for lead-free (K,Na)NbO3 systems with more thermally stable domain structure.

Original languageEnglish
Pages (from-to)27803-27815
Number of pages13
JournalCeramics International
Volume47
Issue number19
DOIs
StatePublished - 1 Oct 2021

Keywords

  • (K,Na)NbO-Based ceramics
  • Doping
  • Lead-free piezoelectrics
  • Manganese
  • Oxygen vacancy defects

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