Structural, spectral, thermal, dielectric, mechanical and optical properties of urea l-alanine acetate single crystals
作者:D. Jaikumar、S. Kalainathan、G. Bhagavannarayana
DOI:10.1016/j.physb.2010.02.053
日期:2010.5
and differential thermal analysis (DTA). Dielectric measurements reveal that the grown crystals have very low dielectric loss. The mechanical behavior was studied by Vickers microhardness test. The grown crystals were found to be transparent in the entire visible region. Preliminary measurement using Kurtz powder technique with Nd-YAG laser light of wavelength 1064 nm indicates that their second harmonic
摘要 一种新的有机非线性光学晶体, 尿素-丙氨酸乙酸酯 (ULAA) 通过溶液生长采用慢冷技术生长, 旨在改善 l-丙氨酸晶体的性能。尿素和 l-丙氨酸材料以 1:4 的摩尔比混合。测定溶解度和亚稳区宽度。单晶XRD分析表明,ULAA的晶格为正交晶系,原始晶格,晶胞参数a =5.7971 A,b =6.0391 A,c =12.3276 A,空间群为P2 1 2 1 2 1 (D 2 4 )。进行高分辨率 X 射线衍射 (HR-XRD) 分析以研究它们的结晶完整性。记录FTIR光谱以确定官能团的存在,并通过1 H NMR光谱确认分子结构。从质谱分析了ULAA的化合物形成比例。已使用热重 (TG) 和差热分析 (DTA) 研究了生长晶体的热强度。介电测量表明,生长的晶体具有非常低的介电损耗。通过维氏显微硬度试验研究了力学行为。发现生长的晶体在整个可见区域都是透明的。使用 Kurtz 粉末技术和波长为