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  4. Perovskite/metal (Bi0.5Na0.5TiO3-BaTiO3/Ag) lead-free composite ceramics featuring enhanced depolarization temperature
 
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2023
Journal Article
Title

Perovskite/metal (Bi0.5Na0.5TiO3-BaTiO3/Ag) lead-free composite ceramics featuring enhanced depolarization temperature

Abstract
The thermal stability of Bi0.5Na0.5TiO3-based piezoelectrics is one of the most critical metrics for practical applications. Finite element method (FEM) calculations estimate that incorporating Ag into the perovskite 0.94Bi0.5Na0.5TiO3–0.06BaTiO3 (BNT-6BT) matrix will generate increased tensile stress during the cooling process from sintering temperatures due to the large mismatch in the thermal expansion coefficient. Thus, we propose a strategy to improve the depolarization temperature (Td) by introducing Ag into the representative BNT-6BT and forming perovskite/metal (BNT-6BT/100xAg) composite ceramics. Td of the composite with x = 0.06 is improved to 145 °C without the degradation of piezoelectric response, which is approximately 45 °C higher than the prototype BNT-6BT. Comparative experiments demonstrate that the increase in Td stems from the synergistic effect of residual thermal stress, colossal grain size (above 200 μm), and oxygen vacancies. The present study provides an effective method to improve the thermal stability of BNT-based ceramics and can be also extended to other systems.
Author(s)
Luo, Huajie
University of Science and Technology Beijing, China
Tang, Shiyu
School of Materials Science and Engineering, Beijing Institute of Technology
Sun, Zheng
University of Science and Technology Beijing, China
Zhang, Yueyun
University of Science and Technology Beijing, China
Yao, Yonghao
University of Science and Technology Beijing, China
Zheng, Huashan
Condensed Matter Science and Technology Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin, China
Yang, Jikun
University of Science and Technology Beijing, China
Ren, Yang
City University of Hong Kong  
Tang, Mingxue
Beijing University of Science and Technology
Huang, Houbing
School of Materials Science and Engineering, Beijing Institute of Technology
Liu, Hui
University of Science and Technology Beijing, China
Hinterstein, Jan Manuel
Fraunhofer-Institut für Werkstoffmechanik IWM  
Chen, Jun
University of Science and Technology Beijing, China
Journal
Acta Materialia  
Project(s)
BNT-BT als zukünftige bleifreie Funktionswerkstoffe für PTCR-, Aktor- und Sensoranwendungen
Attract
Funder
Deutsche Forschungsgemeinschaft  
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.  
DOI
10.1016/j.actamat.2023.119024
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • Barium titanate

  • Depolarization

  • Sintering

  • Thermal expansion

  • Thermodynamic stability

  • Composite ceramic

  • Cooling process

  • Critical metrics

  • Depolarization temperature

  • Lead-Free

  • Piezoelectric

  • Sintering temperatures

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