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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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Yafei Li1, Zhen Zhou, Yongsheng Chen

  • 1Institute of New Energy Material Chemistry, Institute of Scientific Computing, Nankai University, Tianjin 300071, People's Republic of China.

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|June 3, 2009
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The stability of wurtzite nanostructures depends on material and structure. Single-walled nanotubes (SWNTs) are stable for BN and C, while faceted nanotubes and nanowires are preferred for AlN, GaN, ZnO, ZnS, and Si.

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Area of Science:

  • Computational materials science
  • Condensed matter physics
  • Nanotechnology

Background:

  • Investigating the stability of various one-dimensional (1D) and two-dimensional (2D) nanostructures is crucial for understanding their potential applications.
  • Wurtzite materials exhibit diverse atomic bonding configurations, influencing their structural stability.

Purpose of the Study:

  • To investigate the relative stability of one-dimensional (1D) crystalline nanowires, faceted nanotubes, and single-walled nanotubes (SWNTs) for various wurtzite materials.
  • To explore the influence of size and atomic composition on the energetic preferences of different nanostructure types.

Main Methods:

  • First-principles density functional theory (DFT) computations were employed to calculate the energies of different nanostructures.
  • Comparative analysis of the stability of SWNTs, faceted nanotubes, nanowires, and 2D single layers was performed for several wurtzite materials.

Main Results:

  • For Boron Nitride (BN) and Carbon (C), SWNTs are consistently more stable than sp(3)-dominated faceted nanotubes and nanowires, irrespective of diameter.
  • For Aluminum Nitride (AlN), Gallium Nitride (GaN), Zinc Oxide (ZnO), Zinc Sulfide (ZnS), and Silicon (Si), faceted nanotubes and nanowires are energetically favored over SWNTs.
  • Silicon Carbide (SiC) SWNT stability is diameter-dependent, being more stable than thinner faceted structures but less stable than thicker ones, suggesting coexistence.

Conclusions:

  • The relative stability of wurtzite nanostructures is determined by a balance between sp(2) and sp(3) atomic hybridization, influenced by atomic radius and electronegativity differences.
  • The findings highlight the material-specific nature of nanostructure stability, guiding the selection of appropriate structures for specific applications.
  • Coexistence of different nanostructure types, like SiC SWNTs and faceted structures, is possible under certain conditions.