Department of Physics, Periyar University, Salem 636011, TN, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2010 Sep 1;76(5):490-5. doi: 10.1016/j.saa.2010.04.008. Epub 2010 May 7.
Single crystals of the organic nonlinear material gamma-glycine have been grown in the presence of phosphoric acid by slow-evaporation method. The crystal structure is confirmed by X-ray powder diffraction method. The thermal stability and decomposition of the sample have been studied by thermal analysis. The result shows that the transition temperature, i.e. transition from gamma- to alpha-glycine is enhanced from 165 degrees C to 191 degrees C. The modes of vibrations of different molecular groups present in glycine have been identified by spectral analyses. The transmittance spectrum of gamma-glycine crystal shows that the lower UV cut-off wavelength lies at 230nm. Second harmonic generation (SHG) conversion efficiency has been estimated as 125mV and the output power by the crystal was 1.3 times that of potassium dihydrogen phosphate (KDP) crystal. The dielectric and microhardness measurements have been carried out on the gamma-glycine crystal.
在磷酸存在下，通过缓慢蒸发法生长出有机非线性材料γ-甘氨酸的单晶。通过 X 射线粉末衍射法确定了晶体结构。通过热分析研究了样品的热稳定性和分解。结果表明，从γ-到α-甘氨酸的转变温度从 165°C 提高到 191°C。通过光谱分析确定了甘氨酸中不同分子基团的振动模式。γ-甘氨酸晶体的透过率光谱表明，较低的紫外截止波长位于 230nm 处。估计二次谐波产生 (SHG) 转换效率为 125mV，晶体的输出功率是磷酸二氢钾 (KDP) 晶体的 1.3 倍。对γ-甘氨酸晶体进行了介电和显微硬度测量。
