Depolarization Temperature Shift of Li0.08Na0.92NbO3 Lead-Free Piezoelectric Ceramics by High-Electric-Field Poling

概要

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The increase in depolarization temperature induced by the poling of (LixNa1-x)NbO3 ceramics having an Li concentration of $x = 0.08$ (LNN8) was studied. Initially, the Curie temperature $T_{\text{C}}$ was measured to be approximately 300 °C, and it increased after the application of poling at high electric fields; this increase in Curie temperature depended on the poling conditions employed. When poling was performed at 120 °C at an electric field of 5 kV/mm for 5 min, there was no change in $T_{\text{C}}$ and the depolarization temperature was slightly lower than $T_{\text{C}}$. However, both these temperatures increased up on poling at a higher electric field. The X-ray diffraction patterns obtained suggested that the domain volumes of the ceramics were altered by poling at a high electric field and that this structural change caused a change in depolarization temperature.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2008-09-25