Li添加ZnOの強誘電性相転移に及ぼす水蒸気処理の影響

概要

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Ferroelectric phase transitions in Li-doped ZnO and effects of the steam treatment were studied. Ferroelectric phase transitions were investigated by temperature dependence of dielectric constant and observation of D-E hysteresis loop. With the number of the steam treatment, the dielectric-anomaly peak increases then decreases. The surface of specimen deteriorated by the steam treatment was observed by using a scanning electron microscope. A lot of precipitations were found. By X-ray diffraction measurement on the precipitations, the diffraction pattern of Zn(OH)_2 were obtained. It is considered that Zn(OH)_2 is formed in water drop with the steam treatment. D-E hysteresis loops were measured by using an improved Sawyer-Tower circuit. Faint D-E hysteresis loop has been observed in this study. It is revealed that the D-E hysteresis loop becomes clear as the intensity of (002)_<ZnO> diffraction peak becomes stronger.
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