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首页> 外文期刊>Journal of Crystal Growth >Characterization of phosphoric acid doped TGS single crystals
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Characterization of phosphoric acid doped TGS single crystals

机译:磷酸掺杂TGS单晶的表征

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摘要

Single crystals of phosphoric acid (H_3PO_4) doped triglycine sulfate (TGSP) are grown from aqueous solution containing 10-50mol% of H_3PO_4. Large sized crystals of dimension (70 mm x 40 mm x 25 mm) suitable for IR detector applications are obtained with 20 mol% of H_3PO_4. They exhibit elongated domains, and the domain density is higher than in undoped TGS crystals. FT-IR analysis indicates the presence of both zwitter and glycinium ions in the doped TGSP crystals, which is due to the low incorporation of H_3PO_4 into the TGS crystal lattice. The dielectric properties TGSP crystals measured in the temperature range 27-65℃ and in frequency range 102-105 Hz show a broad transition, and the peak dielectric constant values are reduced with increasing H_3PO_4 concentration. Hysteresis loops with high coercive fields are observed up to 20 mol% of H_3PO_4. At a higher concentration, double loops are observed due to the polarization switching inhibition by H_3PO_4 molecules. Dopant concentration is found to have a marginal influence on the spontaneous polarization of the TGSP crystals.
机译:从含有10-50mol%的H_3PO_4的水溶液中生长磷酸(H_3PO_4)掺杂的三甘氨酸硫酸盐(TGSP)的单晶。用20摩尔%的H_3PO_4获得适合红外探测器应用的尺寸(70毫米x 40毫米x 25毫米)的大尺寸晶体。它们显示出细长的畴,并且畴密度比未掺杂的TGS晶体高。 FT-IR分析表明在掺杂的TGSP晶体中同时存在两性离子和甘氨酸离子,这是由于H_3PO_4在TGS晶格中的掺入量较低。在27-65℃的温度范围和102-105 Hz的频率范围内测得的TGSP晶体的介电​​性能表现出较宽的跃迁,并且随着H_3PO_4浓度的增加,介电常数峰值减小。观察到高达20 mol%的H_3PO_4具有高矫顽场的磁滞回线。在较高的浓度下,由于H_3PO_4分子的极化切换抑制作用,观察到双环。发现掺杂剂浓度对TGSP晶体的自发极化具有边际影响。

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