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Journal of Inorganic Materials

Journal of Inorganic Materials >

2025 , Vol. 40 >Issue 5: 545 - 551

DOI: https://doi.org/10.15541/jim20240244

Defect Dipole Thermal-stability to the Electro-mechanical Properties of Fe Doped PZT Ceramics

  • SUN Yuxuan ,
  • WANG Zheng ,
  • SHI Xue ,
  • SHI Ying ,
  • DU Wentong ,
  • MAN Zhenyong ,
  • ZHENG Liaoying ,
  • LI Guorong
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  • 1. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
    2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
SUN Yuxuan (1999-), female, Master candidate. E-mail: sunyuxuan21@mails.ucas.ac.cn
LI Guorong, professor. E-mail: grli@mail.sic.ac.cn

Received date: 2024-05-14

  Revised date: 2024-09-24

  Online published: 2024-11-29

Supported by

National Natural Science Foundation of China(U2241242);National Key R&D Program of China(2023YFB3812000);National Key R&D Program of China(2021YFA0716502)

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Abstract

The accepted doping ion in Ti4+-site of PbZryTi1-yO3 (PZT)-based piezoelectric ceramics is a well-known method to increase mechanical quality factor (Qm), since the acceptor coupled by oxygen vacancy becomes defect dipole, which prevents the domain rotation. In this field, a serious problem is that generally, Qm decreases as the temperature (T) increases, since the oxygen vacancies are decoupled from the defect dipoles. In this work, Qm of Pb0.95Sr0.05(Zr0.53Ti0.47)O3 (PSZT) ceramics doped by 0.40% Fe2O3 (in mole) abnormally increases as T increases, of which the Qm and piezoelectric coefficient (d33) at room temperature and Curie temperature (TC) are 507, 292 pC/N, and 345 ℃, respectively. The maximum Qm of 824 was achieved in the range of 120-160 ℃, which is 62.52% higher than that at room temperature, while the dynamic piezoelectric constant (d31) was just slightly decreased by 3.85%. X-ray diffraction (XRD) and piezoresponse force microscopy results show that the interplanar spacing and the fine domains form as temperature increases, and the thermally stimulated depolarization current shows that the defect dipoles are stable even the temperature up to 240 ℃. It can be deduced that the aggregation of oxygen vacancies near the fine domains and defect dipole can be stable up to 240 ℃, which pins domain rotation, resulting in the enhanced Qm with the increasing temperature. These results give a potential path to design high Qm at high temperature.

Key words： defect dipole; temperature characteristic; oxygen vacancy; electro-mechanical property; mechanical quality factor; hardening doping

Cite this article

SUN Yuxuan , WANG Zheng , SHI Xue , SHI Ying , DU Wentong , MAN Zhenyong , ZHENG Liaoying , LI Guorong . Defect Dipole Thermal-stability to the Electro-mechanical Properties of Fe Doped PZT Ceramics[J]. Journal of Inorganic Materials, 2025 , 40(5) : 545 -551 . DOI: 10.15541/jim20240244

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