Temperature Dependences of Dielectric, Elastic and Piezoelectric Properties of KIO3 Single Crystals Associated with the Successive Phase Transitions.

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  • Maeda Masaki
    Department of Electrical and Computer Engineering, Nagoya Institute of Technology, Gikiso–cho, Showa–ku, Nagoya, Aichi 466–8555
  • Takagi Masayoshi
    Department of Electrical and Computer Engineering, Nagoya Institute of Technology, Gikiso–cho, Showa–ku, Nagoya, Aichi 466–8555
  • Suzuki Ikuo
    Department of Electrical and Computer Engineering, Nagoya Institute of Technology, Gikiso–cho, Showa–ku, Nagoya, Aichi 466–8555

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  • Temperature Dependences of Dielectric, Elastic and Piezoelectric Properties of KIO<sub><b>3</b></sub>Single Crystals Associated with the Successive Phase Transitions

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Abstract

Pottasium iodate, KIO3, belongs to the perovskite structure and undergoes successive phase transitions at T1= 212°C, T2= 72.5°C, T3=-15°C, T4=-160°C and T5=-240°C, respectively. The temperature dependences of the dielectric, elastic and piezoelectic properties have been measured in the temperature range from -263°C to 330°C. The superionic conductivity was found in the temperature range above T2. Pronounced dielectric dispersions in the frequency range below 10 kHz were observed around -160°C and -240°C and the data were analyzed by fitting to the Davidson-Cole and Havriliak-Negami dispersion formulas, respectively. Both dielectric anomalies are ascribed to the orientaional glass-transitions. The piezoelectric and elastic properties have been investigsated by the resonance-antiresonance method. The piezoelectric and elastic anomalies were observed at T2 and T3.

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