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The structures of Ga_3N, GaN_3, Ga_3N_2 and Ga_2N_3 clusters are studied using the full-potential linear-muffin-tin-orbital molecular dynamics (FP-LMTO MD) method. Four structures for Ga_3 N, five structures for GaN_3, nine structures for Ga_3N_2 and nine structures for Ga_2N_3 have been obtained. The most stable structures of these clusters are planar ones. A strong dominance of the N--N bond over the Ga--N and Ga--Ga bonds appears to control the structural skeletons, supporting the previous result obtained by Kandalam and co-workers. The most stable structures of these small GaN clusters displayed semiconductor-like properties through the calculation of the HOMO-LUMO gaps. 相似文献
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全势能线性Muffin-Tin轨道组合分子动力学方法及其在半导体团簇结构计算中的应用 总被引:1,自引:0,他引:1
研究原子团簇的结构及其与之相关的物理和化学的性质是当前国际上一个活跃的研究前沿.全势能线性Muffin-Tin轨道组合法是目前国际上最先进的第一性原理分子动力学方法之一.本文简要地阐述了全势能线性Muffin-Tin轨道组合法的原理,以及本研究小组用此方法在半导体原子团簇结构研究中的部分结果. 相似文献
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用局域密度泛函近似下的全势能线性Muffin-Tin轨道组合分子动力学方法对氮化镓小团簇GanNn(n=2~6)的结构和能量进行了计算,并和已有的报道进行了比较.除Ga2N2外,获得了所有上述团簇的新的最稳定结构.最稳定结构中存在着N2单元或N3单元或两者兼有,表明N-N键在GanNn(n=2~6)团簇的形成中起着决定性的作用.同时,对上述团簇的HOMO-LUMO能量间隔进行了计算.HOMO-LUMO能量间隔为1.601~2.667eV,表明上述团簇将显示像半导体一样的性质. 相似文献
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The structures and energies of a Ga4N4 cluster have been calculated using a full-potential linear-muffin-tin-orbital molecular-dynamics (FP-LMTO MD) method. We obtained twenty-four structures for a Ga4N4 cluster. The most stable structure we obtained is a C8 three-dimensional structure, the energy of which is lower than that of the C2v symmetry structure proposed by Kandalam et al. [J. Phys. Chem. B106 (2002) 1945] The calculated results show that the isomer with an N3 subunit is preferred, supporting the previous result made by Kandalam et al,We found that the most stable structure of Ga4N4 clusters presented semiconductor-like properties through the calculation of the density of states. 相似文献
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利用2-呋喃甲醛与水杨酰肼缩合成一种含有呋喃环的新型芳酰腙2-呋喃甲醛缩水杨酰腙L,将L与MnCl2·4H2O在乙醇-丙酮体系中反应得配合物MnL2Cl2,对配合物进行Ⅹ-射线单晶衍射、Ⅹ-射线粉末衍射、元素分析、核磁共振、红外光谱、紫外光谱、热重分析、荧光光谱表征.结构分析表明配合物MnL2Cl2呈现扭曲八面体构型,属于单斜晶系,空间群P2/c,晶胞参数a=0.8225(8) nm,b=1.9079(17) nm,c=1.8638 (14) nm,β=115.40(3)°,V=2.642(4) nm3,Z=4.配合物分子通过分子间氢键和苯环面对面π…π作用力形成二维链状结构,继而在层与层之间通过边对面π…π作用力构成三维层状超分子结构.热重分析表明,该配合物有较高的热稳定性;荧光光谱显示配体形成配合物后荧光性明显增强. 相似文献