한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제56권6호
  • /
  • Pages.380-385
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  • 2023
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
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Pyroelectricity of BaTiO3-doped PMNT ferroelectric system for pyroelectric sensor

  • 투고 : 2023.11.26
  • 심사 : 2023.12.14
  • 발행 : 2023.12.31
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초록

In this study, an MPB PMNT system containing 0.05 to 0.10 wt.% BaTiO3 was synthesized using a traditional chemical method and its pyroelectricity was investigated. Pyroelectricity, dielectricity, and ferroelectricity of the synthesized BaTiO3-PMNT system were analyzed by heat treatment at 1240~1280 ℃ for 4 hours to evaluate its applicability as a pyroelectric sensor. Unlike the simple ABO3 ferroelectric, the BaTiO3-doped PMNT system exhibited phase transition characteristics over a wide temperature range typical of complex perovskite structures. Although no dramatic change could be confirmed depending on the amount of BaTiO3 added, stable pyroelectricity was maintained near room temperature and over a wide temperature range. When the amount of BaTiO3 added increased from 0.05BaTiO3-PMNT to 0.10BaTiO3-PMNT, the electric field slightly increased from 5.00×103 kV/m to 6.75×103 kV/m, and the maximum value of remanent polarization slightly increased from 0.223 C/m2 to 0.234 C/m2. The pyroelectric coefficients of 0.05BaTiO3-PMNT and 0.10BaTiO3- PMNT at room temperature were measured to be ~0.0084 C/m2K and ~0.0043 C/m2K, respectively. The relaxor ferroelectric properties of the BaTiO3-PMNT system were confirmed by analyzing the plot of Kmax/K versus (T-Tmax)γ. The BaTiO3-doped MPB PMNT system showed a distinct pyroelectric performance index at room temperature, and the values were Fv ~ 0.0362 m2/C, Fd ~ 0.575×10-4 Pa-1/2.

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참고문헌

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