Department of Physics, St. Mary's College, Thoothukudi-628 001, Tamilnadu, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Oct 15;81(1):270-5. doi: 10.1016/j.saa.2011.06.009. Epub 2011 Jun 28.
Phosphoric acid admixtured L-alanine (PLA) single crystals were grown successfully by solution method with slow evaporation technique at room temperature. Crystals of size 18 mm×12 mm×8 mm have been obtained in 28 days. The grown crystals were colorless and transparent. The solubility of the grown samples has been found out at various temperatures. The lattice parameters of the grown crystals were determined by X-ray diffraction technique. The reflection planes of the sample were confirmed by the powder X-ray diffraction study and diffraction peaks were indexed. Fourier transform infrared (FTIR) studies were used to confirm the presence of various functional groups in the crystals. UV-visible transmittance spectrum was recorded to study the optical transparency of grown crystal. The nonlinear optical (NLO) property of the grown crystal was confirmed by Kurtz-Perry powder technique and a study of its second harmonic generation efficiency in comparison with potassium dihydrogen phosphate (KDP) has been made. The mechanical strength of the crystal was estimated by Vickers hardness test. The grown crystals were subjected to thermo gravimetric and differential thermal analysis (TG/DTA). The dielectric behavior of the sample was also studied.
采用溶液法-室温缓慢蒸发法成功生长出掺磷酸的 L-丙氨酸（PLA）单晶体。在 28 天内获得了尺寸为 18mm×12mm×8mm 的无色透明晶体。研究了晶体在不同温度下的溶解度。通过 X 射线衍射技术确定了晶体的晶格参数。通过粉末 X 射线衍射研究确定了样品的反射面，并对衍射峰进行了标定。傅里叶变换红外（FTIR）研究用于确认晶体中存在的各种官能团。记录了紫外-可见透射光谱以研究生长晶体的光学透明度。通过 Kurtz-Perry 粉末技术确认了生长晶体的非线性光学（NLO）性质，并与磷酸二氢钾（KDP）进行了比较，研究了其二次谐波产生效率。通过维氏硬度试验估计了晶体的机械强度。对生长晶体进行了热重分析和差热分析（TG/DTA）。还研究了样品的介电性能。
