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首页> 外文期刊>Crystal growth & design >Isostructural Cd3E2 (E = P, As) microcrystals prepared via a hydrothermal route
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Isostructural Cd3E2 (E = P, As) microcrystals prepared via a hydrothermal route

机译：通过水热法制备的同构Cd3E2（E = P，As）微晶

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Cd3P2 and alpha ''-Cd3As2 microcrystals were hydrothermally synthesized at 180 degrees C in aqueous ammonia. Their powder X-ray diffraction patterns were indexed to an isostructural tetragonal lattice with a = 8.7360 angstrom. b = 12.2953 angstrom for Cd3P2) and a = 8.9843 angstrom, b = 12.6550 angstrom for Cd3As2 (alpha ''-, metastable phase) with good reliability (instead of the stable phase (alpha-Cd3As2). Transmission and scanning electron microscopy (TEM, SEM) images showed that Cd3P2 crystallized as octahedral microcrystals of 100-500 nm with I 10 11 cleavage planes, and alpha ''-Cd3As2 crystallized as fine nanocrystals (20 rim), which assembled into secondary spherical particles of 100 nm. X-ray photoelectron spectroscopy (XPS) showed that the as-prepared hydrothermal products were pure Cd3E2 (E = P, As) without obvious surface oxidation or hydrolysis. Cd3P2 octahedral microcrystals showed three Raman peaks at 250.7, 300.8, and 599.1 cm(-1), and alpha ''-Cd3As2 nanocrystals showed two broad and red-shifted peaks at 189 and 244.5 cm(-1), both of which were different from their bulk counterparts. Their optical absorption spectra were characterized, and alpha ''-Cd3As2 nanocrystals showed an obvious blue-shift of the absorption onset.
机译：Cd3P2和α'-Cd3As2微晶是在180℃下在氨水中水热合成的。他们的粉末X射线衍射图被标为a = 8.7360埃的同构四方晶格。对于Cd3P2，b = 12.2953埃），对于a = 8.9843埃，对于Cd3As2（α--，亚稳相），b = 12.6550埃，具有良好的可靠性（而不是稳定相（alpha-Cd3As2）。）透射和扫描电子显微镜（TEM） ，SEM）图像显示Cd3P2结晶为100-500 nm的八面体微晶，具有I 10 11裂解平面，而α''-Cd3As2结晶为细纳米晶体（20边缘），组装成100 nm的次级球形颗粒。射线光电子能谱（XPS）显示，所制备的水热产物为纯Cd3E2（E = P，As），没有明显的表面氧化或水解; Cd3P2八面体微晶在250.7、300.8和599.1 cm（-1）处显示三个拉曼峰。 ，和α''-Cd3As2纳米晶体在189和244.5 cm（-1）处显示两个宽峰和红移峰，这两个峰与体相峰不同。它们的光吸收光谱得到了表征，并且α''-Cd3As2纳米晶体呈现明显的蓝色吸收开始的位移。

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