利用本实验室生长的红外非线性晶体材料AgGaGeS_4(AGGS),常温下进行腐蚀实验并观察畴结构,测试了不同频率、电压下晶体的电滞回线以及同一电压下不同频率介质的电容值.腐蚀图像显示出畴结构,畴尺寸5～10 μm左右,证实AGGS为一热释电晶体.然而,室温下的电滞回线变形为一近似椭圆,介质电容与电场频率关系表现出强色散特性.本文对这一现象进行了系统分析,最后提出了进一步探索AGGS铁电性质的具体建议.
Nonlinear crystal material AgGaGeS_4(AGGS) was obtained by our laboratory via Bridgman method, the as-prepared AGGS crystal were characterized with chemical corrosion and dielectricity were studied by dielectric hysteresis. The corrosion figures show domain structure existing in AGGS crystals with the size 5 μm to 10 μm, which indicate that AGGS is a pyroelectric crystal. However, the dielectric hysteresis loop test resulted in distorted elliptixcal figures, the relationship between dielectric permittivity and the frequency was characterized by a strong dispersion in the dielectric permittivity measurements. In order to definitely determine if the AGGS crystal is classified as a ferroelectric material, then can be made in the form of the periodic poled configuration, further experiment schedules were proposed.
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