掺杂TGS晶体的生长及热释电性能研究

Study on Growth and Property of Heavy Rare Earth Dy^(3+) Doped TGS Crystals

选择重稀土离子Dy3+为掺杂阳离子,DL-丙氨酸与L-谷氨酸部分取代甘氨酸分子,生长了不同掺杂配比的TGS晶体。生长和测试实验表明,掺杂TGS晶体较纯TGS晶体易于生长。将掺杂晶体生长溶液的pH值控制在1~4,可改变掺杂晶体的结晶习性。用ICP发射光谱测试了掺杂晶体中稀土元素的含量,用X射线粉末衍射法测定了晶格参数,结果表明:元素已进入晶体,晶格参数稍有变化,但掺杂晶体的对称性仍为C2-2。通过测量掺杂晶体的电滞回线,得到了内偏压场,还测量了各样品的热释电系数、自发极化强度,作了温度曲线,并分析了各掺杂剂对提高热释电性能和锁定极化的作用。结果表明:是有应用前景的热释电材料。

By choosing heavy rare earth Dy^3＋ as doping cation, and through DL-alamine and L-glulamatie acid partially substituting for glyeine moleeulars, several doped TGS crystals were successfully grown. The growth experiments and the measured results indieat that the growth of doped TGS crystals are easier than pure TGS. When the pH value of the growth solution for doped crystals is kept between 1 and 4, the growth habit of doped crystals is changed. The amount of rare earth elements in doped crystals is tested using ICP emission spectrum method. The lattice parameters are measured using X-ray powder diffraction method. The results show that the elements have entered into the crystals. But the symmertry remains C2- 2 . Through the measurement of ferroeleetric hysteresis loops of the doped crystals, the inner bias field is received. The temperature dependence curve of pyroeleetfie coefficient, spontaneous polarization are measured. The influence of various dopants on the pyroeleetrie property and polarization restraint is analyzed, the results show that this series of TGS are excellent pyroelectrie materials.