High-Power Piezoelectric Characteristics of Sr₂Bi₄Ti₅O₁₈-Ca₂Bi₄Ti₅O₁₈-Based Ferroelectric Ceramics

Abstract:

The high-power piezoelectric characteristics of lead-free piezoelectric ceramics, based on a bismuth layer-structured ferroelectric, MnCO₃-doped (Sr_0.7Ca_0.3)₂Bi₄Ti₅O₁₈ (abbreviated as SCBT0.3 + Mn x wt%), were studied. SCBT0.3 + Mn x wt% lead-free ceramics showed an extremely high mechanical quality factor (Q_m) of more than 3000 in the (33) vibration mode under small-amplitude vibration. The high-power piezoelectric characteristics of SCBT0.3 + Mn x wt% were measured using the high-power measurement method based on frequency sweep driving under a constant voltage condition. It was found that the vibration velocity v_0-p of SCBT0.3 + Mn 0.2 wt% linearly increased up to approximately 3.0 m/s. Therefore, the Mn-doped SCBT0.3-based ceramics are a promising candidate for lead-free high-power applications.

• Periodical: Key Engineering Materials (Volume 485)
• Pages: 93-96
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.485.93
• Online since: July 2011
• Authors: Yoji Noumura, Shigeki Sato, Yuji Hiruma, Hajime Nagata, Tadashi Takenaka
• Keywords: Bismuth Layer-Structured Ferroelectrics, High-Power Characteristics, Lead-Free Piezoelectric Ceramic, Mechanical Quality Factor, Sr₂Bi₄Ti₅O₁₈-Ca₂Bi₄Ti₅O₁₈, Vibration Velocity

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