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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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相关实验视频

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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
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H型Ce2[Si2O7] 类型的电池,它可以在电池中使用.

Ralf Jules Christian Locke1, Maria Weis1, Thomas Schleid1

  • 1Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.

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概括
此摘要是机器生成的。

滴 (III) 氧化酸盐,Ce2[Si2O7],被发现是一种具有H型结构的副产品. 这种化合物与H-La2[Si2O7]同型,具有独特的协调和单位.

关键词:
是最重要的元素之一.晶体结构 晶体结构这是同类型的特征.氧化二酸盐是一种氧化酸盐.稀土金属是一种稀土金属.

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科学领域:

  • 无机化学 无机化学
  • 固态化学 固态化学
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 化合物在各种应用中至关重要,包括催化和材料科学.
  • 了解酸的结构多样性对于开发新材料至关重要.
  • 之前的研究已经探索了各种氧化和酸盐结构.

研究的目的:

  • 描述二(III) 氧化二酸盐 (Ce2[Si2O7]) 的晶体结构.
  • 为了研究这种新型化合物中离子的协调环境.
  • 为了比较结构与同类型的 lanthanum化合物.

主要方法:

  • 使用单晶X射线衍射来确定晶体结构.
  • 化学合成是使用化片进行的.
  • 结构分析涉及确定协调多面体和酸盐单位.

主要成果:

  • 作为一种副产品,二 (III) 氧化酸盐 (Ce2[Si2O7]) 被合成.
  • 该化合物结晶成H型结构,同型为H-La2[Si2O7].
  • 四个不同的Ce (III) 离子表现出各种协调几何形状 (扭曲的正方形反镜,封顶和双封顶的正方形反镜).
  • 四个独特的原子是分离的[Si2O7](6-) 单元的一部分.

结论:

  • 发现Ce2[Si2O7]扩大了已知的酸的结构化学.
  • 离子的协调多样性凸显了这种结构的适应性.
  • 进一步的研究可能会探索这种材料的特性和潜在应用.