排序方式: 共有6条查询结果,搜索用时 31 毫秒
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采用热蒸发法在氧化铟锡玻璃上制备三氧化钼(MoO3)纳米带薄膜。通过扫描电镜、X射线衍射、红外光谱分析了纳米带的表面形貌及结构,通过紫外-可见-近红外光谱以及光致发光谱分析了电致变色前后纳米带光学性能以及缺陷分布情况。结果表明:纳米带的光学带隙为3.36eV,变色前纳米带内部就存在着部分由晶格畸变和氧空位产生的+5价Mo离子;变色后,注入的Li+和e-使材料内部的[MoO6]八面体发生新的畸变,产生新的Mo5+。电子在+6价和+5价的Mo离子间发生迁移而导致着色。 相似文献
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Atomic bonding and mechanical properties of Al-Mg-Zr-Sc alloy 总被引:5,自引:0,他引:5
The valence electron structures of AI-Mg alloy with minor Sc and Zr were calculated according to the empirical electron theory(EET) in solid. The results show that because of the strong interaction of AI atom with Zr and Sc atom in melting during solidification, the Al3 Sc and Al3 (Sc1-xZrx) particles which act as heterogeneous nuclear are firstly crystallized in alloy to make grains refine. In progress of solidification, the Al-Sc, Al-Zr-Sc segregation regions are formed in solid solution matrix of Al-Mg alloy owing to the strong interaction of Al atom with Zr, Sc atoms in bulk of alloy, so in the following homogenization treatment, the finer dispersed Al3Sc and Al3 (Sc1-xZrx) second-particles which are coherence with the matrix are precipitated in the segregation region. These finer secondparticles with the strong Al—Zr, Al—Sc covalent bonds can strengthen the covalent bonds in matrix of the alloy, and also enhance the hardness and strength of Al-Mg alloy. Those finer second-particles precipitated in interface of sub-grains can also strengthen the covalence bonds there, and effectively hinder the interface of sub grains from migrating and restrain the sub-grains from growing, and cause better thermal stability of Al-Mg alloy. 相似文献
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Al-Cu合金亚稳相的价电子结构分析 总被引:13,自引:5,他引:8
应用固体电子理论(EET),对A1-Cu合金时效析出的若干亚稳相的价电子结构进行计算。结果表明,在时效初期,θ”相中Cu原子处于第七杂阶,比金属Cu的原子杂阶低,而最靠近Cu原子的A1原子则处于第五杂阶;由θ”相溶解形成相θ’时,Al原子处于第四杂阶,而Cu原子状态发生较大变化,从基体的第九杂阶上升到第十三杂阶,使得Cu原子的共价电子数有较大幅度的提高,因此形成的θ’亚稳相的最强共价键较θ”亚稳相的要强l倍,这就从价电子结构层次上解释了θ”和θ’亚稳相的热稳定性。 相似文献
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