硫酸グリシン単結晶の育成,分域構造および放射線照射効果

抄録

Crystals of glycine sulfate are grown in ferroelectric and paraelectric temperature ranges by circulating method, by slowly cooling method and as b-plate. Changes of domain structure by poling and annealing are investigated. The crystals prepared in ferroelectric phase tend to assume multidomain structure in time, while those prepared in paraelectric phase do not. Addition of metallic ions to mother solution such as Fe, Cr, Cd, Mg and Cu, changes the crystal habit, and the grown crystals show some anomalies in dielectric hysteresis loop. The coersive field increases and there appears a biasing field. The effects of irradiation of β rays on the domain structure and the hysteresis loop are observed. The polarization is apt to resume the direction in which the crystal was polarized when irradiated and, therefore, a biased or double hysteresis loop appears. The shape of the double loop and the mechanism of its appearance are discussed.