Department of Physics with Computer Applications, LRG Government Arts College for Women, Tiruppur 641604, Tamilnadu, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2012 Jun;91:370-4. doi: 10.1016/j.saa.2012.01.067. Epub 2012 Feb 4.
Single crystals of potassium acid phthalate (KAP) have been grown from aqueous solution by slow evaporation technique by adding l-alanine (LA), glycine (Gly) and l-tyrosine (LT) as additives. Powder X-ray diffraction studies confirmed the phase formation and amino acids doping into KAP crystals. The optical absorption studies reveal that the LA doped crystals possess less absorption of visible ray than the pristine, Gly and LT doped KAP crystals. Optical transmission is found to be low in LT doped KAP than in all the other crystals. TG-DTA studies show the decomposition temperatures to be 255 °C, 232 °C, 258 °C and 264 °C for pure, LA, Gly and LT doped KAP crystals respectively. SHG efficiency of LA doped KAP crystal was found to be 1.1 times (31 mV for KDP and 34 mV for LA doped KAP) that of potassium dihydrogen phosphate (KDP) crystal. This is much higher when compared to that of undoped KAP crystal (12mV). The grown crystals were also subjected to FTIR, microhardness and dielectric studies.
从水溶液中通过缓慢蒸发技术生长出邻苯二甲酸氢钾（KAP）的单晶体，并添加 l-丙氨酸（LA）、甘氨酸（Gly）和 l-酪氨酸（LT）作为添加剂。粉末 X 射线衍射研究证实了相形成和氨基酸掺杂到 KAP 晶体中。光学吸收研究表明，与原始晶体、Gly 和 LT 掺杂的 KAP 晶体相比，LA 掺杂的晶体对可见光的吸收较少。LT 掺杂的 KAP 晶体的光透过率比所有其他晶体都低。TG-DTA 研究表明，纯 KAP、LA、Gly 和 LT 掺杂的 KAP 晶体的分解温度分别为 255°C、232°C、258°C 和 264°C。LA 掺杂的 KAP 晶体的 SHG 效率是磷酸二氢钾（KDP）晶体的 1.1 倍（KDP 晶体为 31 mV，LA 掺杂的 KAP 晶体为 34 mV）。与未掺杂的 KAP 晶体（12 mV）相比，这要高得多。还对生长的晶体进行了傅里叶变换红外光谱（FTIR）、显微硬度和介电研究。
