고온 진동 센서용 BiFeO3-BaTiO3 압전세라믹의 나노 BaTiO3 모분말 도입에 따른 화학적 불균일성 및 압전 특성 연구 (Effect of Nano-BaTiO3 Raw Powder on Chemical Heterogeneity and Piezoelectric Properties of BiFeO3-BaTiO3 Ceramics for High-temperature Vibration Sensor)

서지정보

· 발행기관 : 한국소음진동공학회
· 수록지 정보 : 한국소음진동공학회논문집 / 32권 / 6호 / 588 ~ 600페이지
· 저자명 : 박규현, 이경자, 이민구

초록

1mol% MnO2-doped 0.7BiFeO3-0.3BaTiO3 (BFO-BTO) piezoceramics were synthesized through a conventional solid-state method, using nano-sized BaTiO3 raw powders. In the application of the nano-BaTiO3 raw powders, the phase structure, chemical heterogeneity, microstructure, ferroelectric, and piezoelectric properties significantly changed, compared to the application of conventional micron-sized BaCO3 and TiO2 raw powders. The sintered BFO-BTO piezoceramics showed a reduced chemical heterogeneity and strong ferroelectric nature, whereas the counterparts using the conventional micron-sized raw powders typically exhibited a core-shell structure with a high degree of chemical heterogeneity, causing a relaxor characteristic. In addition, the piezoceramics sintered using the nano-sized BaTiO3 exhibited greater piezoelectric, ferroelectric and insulating properties, compared to those of ceramics sintered using the conventional micron-sized raw powders. The property enhancements of the BFO-BTO piezoceramics were attributed to the effects of reduced chemical heterogeneity, large grain size, low leakage current and the formation of appropriate morphotropic phase boundary. Finally, the achieved high TC of 519.1°C and excellent thermal aging resistance of d33 up to 480°C indicate great potential for use in high-temperature environments.

영어초록

1mol% MnO2-doped 0.7BiFeO3-0.3BaTiO3 (BFO-BTO) piezoceramics were synthesized through a conventional solid-state method, using nano-sized BaTiO3 raw powders. In the application of the nano-BaTiO3 raw powders, the phase structure, chemical heterogeneity, microstructure, ferroelectric, and piezoelectric properties significantly changed, compared to the application of conventional micron-sized BaCO3 and TiO2 raw powders. The sintered BFO-BTO piezoceramics showed a reduced chemical heterogeneity and strong ferroelectric nature, whereas the counterparts using the conventional micron-sized raw powders typically exhibited a core-shell structure with a high degree of chemical heterogeneity, causing a relaxor characteristic. In addition, the piezoceramics sintered using the nano-sized BaTiO3 exhibited greater piezoelectric, ferroelectric and insulating properties, compared to those of ceramics sintered using the conventional micron-sized raw powders. The property enhancements of the BFO-BTO piezoceramics were attributed to the effects of reduced chemical heterogeneity, large grain size, low leakage current and the formation of appropriate morphotropic phase boundary. Finally, the achieved high TC of 519.1°C and excellent thermal aging resistance of d33 up to 480°C indicate great potential for use in high-temperature environments.

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