Enhanced Electrical Properties of Lead-Free Piezoelectric KNLN-BZ-BNT Ceramics With the Modification of Sm3+ Ions

These results show the Sm3+-modified KNLN-BZ-BNT ceramics are good for further applications even under high temperature

Yi Quan; Lingyan Wang; Wei Ren; Jinyan Zhao; Jian Zhuang; Kun Zheng; Zhe Wang; Tomoaki Karaki; Zhishui Jiang; Li Wen

2021

Scholarcy highlights

  • In recent years, environmental problems are a major concern in the whole world
  • The lowest and highest Pmax appeared in the un-doped and 0.1 mol % Sm3+ ion–doped KNLN-BZ-BNT ceramics, respectively
  • The highest d33 and d33* are 325 pC/N and 384 pm/V, respectively. These results indicate that the 0.3 mol% Sm3+ addition is the most effective way to improve the piezoelectric response of KNLN-BZ-BNT ceramics
  • To investigate the thermal stability of the Sm3+-doped KNLN-BZ-BNT ceramics, the temperature dependence of unipolar strain and polarization–electrical field loops is shown in Figures 5A,B, respectively
  • The best performances appeared in the sample with 0.3 mol% Sm3+ ions, showing a d33 of 325 pC/N, a d33* of 384 pm/V, a Pr of 11.19 μC/ cm2, and a high strain of 0.114% at 30 kV/cm
  • It can be found that the normalized d33* of the sample decreased less than 20% when the temperature raised from 30 to 180oC, which is better than that in the PZT-5H ceramics
  • The d33* values decreased less than 20% when the temperature raised from 30 to 180oC. These excellent results show the Sm3+-modified KNLN-BZ-BNT ceramics are good for further applications even under high temperature

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