Nonlinear Behavior and High-Power Properties of (Bi,Na,Ba)TiO₃ and (Sr,Ca)₂NaNb₅O₁₅ Piezoelectric Ceramics

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概要

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• The nonlinear behaviors and high-power properties of two lead-free piezoelectric ceramics --- (Bi_1/2Na_1/2)_0.85Ba_0.15Ti_0.98Mn_0.02O₃ (BNBTM) and Sr_1.9Ca_0.1NaNb₅O₁₅ (SCNN) --- were clarified by comparison of their mechanical characteristics using the continuous driving method. BNBTM ceramics exhibited jump phenomena with constant-voltage driving that were similar to those found in Pb(Zr,Ti)O₃-based (PZT) ceramics. The jump phenomena of SCNN ceramics produced mirror-reversed images relative to those of BNBTM ceramics. Their nonlinear behaviors were caused by the soft-spring effect and hard-spring effect, respectively. Among the piezoelectric materials, SCNN ceramics possess notable elastic properties. With increasing vibration velocity, their rise in temperature was lower than that of PZT ceramics; in particular, the temperature of SCNN ceramics was lower than that of BNBTM ceramics. The quality factor of BNBTM ceramics gradually decreased and that of SCNN ceramics showed a broad peak. The degradation of the quality factor was thus limited, resulting in a gradual increase in the equivalent mechanical resistance.

• 2011-09-25

著者

• Hirose Seiji

  Yamagata Univ. Yamagata Jpn

• Mizuno Youichi

  Taiyo Yuden Co. Ltd. Gunma Jpn

• Hirose Seiji

  Yamagata University, Yonezawa, Yamagata 992-8510, Japan

• Doshida Yutaka

  Taiyo Yuden Co., Ltd., Takasaki, Gunma 370-3347, Japan

• Shimizu Hiroyuki

  Taiyo Yuden Co., Ltd., Takasaki, Gunma 370-3347, Japan

• Itoh Keita

  Yamagata University, Yonezawa, Yamagata 992-8510, Japan

• Tamura Hideki

  Tohoku Institute of Technology, Sendai 982-8577, Japan

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