Li添加ZnO強誘電性セラミックスの極性軸配向試料の作製

概要

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A new method for the synthesis of Li-doped ZnO ferroelectric ceramics specimen with highly oriented polar axis is developed. In this method the ceramics specimen of Li-doped ZnO prepared by SPS (Spark Plasma Sintering) system was crushed and powdered for 2 to 4 hours and then hardened into a pellete form by applying a pressure of 70kN and heat-treated at 800℃ for 24hr. X-ray diffraction measurements were proceeded in order to check the degree of preferred orientation of the polar c-axis and it was confirmed that the newly developed specimen has highly oriented polar c-axis.The dielectric constant vs. temperature characteristics of the new specimen were measured at a temperature range of 293-503K at 1, 10 and 100kHz. A dielectric anomaly was observed at about 415K, that is nearly the same temperature at which secondary dielectric anomaly of Li-doped ZnO prepared by SPS system exists. D-E hysteresis loops of the specimen were measured by using Sawyer-Tower circuit.
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