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首页> 外文期刊>Physica, B. Condensed Matter >Structural, spectral, thermal, dielectric, mechanical and optical properties of urea L-alanine acetate single crystals
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Structural, spectral, thermal, dielectric, mechanical and optical properties of urea L-alanine acetate single crystals

机译：尿素L-丙氨酸乙酸酯单晶的结构，光谱，热，介电，机械和光学性质

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摘要

A new organic nonlinear optical crystal, urea L-alanine acetate (ULAA) has been grown by solution growth using slow cooling technique with the vision to improve the properties of the L-alanine crystals. Urea and L-alanine material were mixed in the molar ratio 1:4. Solubility and metastable zone width were determined. Single crystal XRD analyses revealed that the crystal lattice of ULAA is orthorhombic ;system, primitive lattice with cell parameters a=5.7971 angstrom, b=6.0391 angstrom, c=12.3276 angstrom with space group P2(1)2(1)2(1) (D-2(4)). High-resolution X-ray diffraction (HR-XRD) analysis was carried out to study their crystalline perfection. FTIR spectrum was recorded to identify the presence of functional groups and molecular structure was confirmed by H-1 NMR spectrum. From the mass spectrum, the ratio of compound formation of ULAA was analyzed. Thermal strength of the grown crystal has been studied using thermo-gravimetric (TG) 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 generation (SHG) efficiency is roughly equal to that of pure KDP.
机译：一种新型有机非线性光学晶体，尿素L-丙氨酸乙酸酯（ULAA）通过溶液生长使用缓慢冷却技术生长，旨在改善L-丙氨酸晶体的性能。将尿素和L-丙氨酸材料以1：4的摩尔比混合。确定了溶解度和亚稳区宽度。单晶XRD分析表明ULAA的晶格是正交晶系;单元参数为a = 5.7971埃，b = 6.0391埃，c = 12.3276埃，空间群为P2（1）2（1）2（1）的原始晶格。 （D-2（4））。进行了高分辨率X射线衍射（HR-XRD）分析，以研究其晶体完整性。记录FTIR光谱以鉴定官能团的存在，并且通过H-1 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。通过维氏显微硬度测试研究了机械性能。发现生长的晶体在整个可见光区域是透明的。使用Kurtz粉末技术对波长为1064 nm的Nd-YAG激光进行的初步测量表明，其二次谐波生成（SHG）效率与纯KDP大致相等。

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