Precipitation Hardening in Ferroelectric Ceramics

Changhao Zhao, Shuang Gao, Tiannan Yang, Michael Scherer, Jan Schultheiß, Dennis Meier, Xiaoli Tan, Hans Joachim Kleebe, Long Qing Chen, Jurij Koruza*, Jürgen Rödel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Domain wall motion in ferroics, similar to dislocation motion in metals, can be tuned by well-concepted microstructural elements. In demanding high-power applications of piezoelectric materials, the domain wall motion is considered as a lossy hysteretic mechanism that should be restricted. Current applications for so-called hard piezoelectrics are abundant and hinge on the use of an acceptor-doping scheme. However, this mechanism features severe limitations due to enhanced mobility of oxygen vacancies at moderate temperatures. By analogy with metal technology, the authors present here a new solution for electroceramics, where precipitates are utilized to pin domain walls and improve piezoelectric properties. Through a sequence of sintering, nucleation, and precipitate growth, intragranular precipitates leading to a fine domain structure are developed as shown by transmission electron microscopy, piezoresponse force microscopy, and phase-field simulation. This structure impedes the domain wall motion as elucidated by electromechanical characterization. As a result, the mechanical quality factor is increased by ≈50% and the hysteresis in electrostrain is suppressed considerably. This is even achieved with slightly increased piezoelectric coefficient and electromechanical coupling factor. This novel process can be smoothly implemented in industrial production processes and is accessible to simple laboratory experimentation for microstructure optimization and implementation in various ferroelectric systems.

Original languageEnglish
Article number2102421
JournalAdvanced Materials
Volume33
Issue number36
DOIs
Publication statusPublished - 7 Sep 2021
Externally publishedYes

Keywords

  • dielectrics
  • electromechanical hardening
  • ferroelectrics
  • mechanical quality factor
  • precipitation

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Fields of Expertise

  • Advanced Materials Science

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