Temperature Dependences of Resonance Frequency on SrBi₂Nb₂O₉–Bi₄Ti₃O₁₂ Ceramics

Abstract

Temperature dependences of piezoelectric properties on mixed bismuth layer-structured ferroelectrics (BLSFs), SrBi₂Nb₂O₉-Bi₄Ti₃O₁₂ (SBN-BIT), were studied for resonator applications, aiming to have a low temperature coefficient of resonance frequency (TC-f). The SBN-BIT ceramic exhibited double dielectric anomaly peaks at 250 and 706°C from the measurement of temperature dependences of dielectric properties. We confirmed that the temperature dependences of resonance frequency also had anomaly peak at the first phase transition temperature, indicating the minimum TC-f value. In particular, the TC-f values of the (t) mode indicated −52.3 ppm/°C for the temperature range below 250°C and +4.7 ppm/°C above 250°C, which is very close to 0 ppm/°C. Moreover, it was clarified that a grain orientation was very effective for improving the TC-f values.

Keywords:

• Mixed-bismuth layer-structured ferroelectrics
• grain orientation
• piezoelectric properties
• temperature coefficient of resonance frequency

Acknowledgments

The authors would like to thank TOHO TITANIUM CO., LTD. for providing high purity titanium oxide powder. This work was partially supported by a Grant-in-Aid from the Murata Science Foundation.