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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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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
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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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Layer-Stacking Sequence Governs Ion-Storage in Layered Double Hydroxides.

Tomohito Sudare1, Mizuki Ueda2, Takuro Yamaguchi2

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The stacking sequence of layered double hydroxides (LDHs) significantly impacts nitrate storage. The 2H1 polytype offers 400% greater nitrate storage capacity than the 3R1 polytype due to its softer lattice structure.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Inorganic Chemistry

Background:

  • Layered materials offer tunable ion transport and storage via host-ion interactions.
  • The influence of stacking sequence on anion storage in layered materials is less understood compared to cation storage.

Purpose of the Study:

  • To investigate the role of layer-stacking sequence in governing nitrate storage properties of layered double hydroxides (LDHs).
  • To elucidate the mechanisms behind varying nitrate storage capacities in different LDH polytypes.

Main Methods:

  • Synthesis and characterization of different LDH polytypes.
  • Quartz crystal microbalance with dissipation monitoring (QCM-D) for in-situ analysis.
  • Multimodal *ex situ* experiments to analyze structural changes.

Main Results:

  • The 2H1 polytype of LDHs exhibits a 400% higher nitrate storage capacity compared to the 3R1 polytype.
  • The enhanced capacity of 2H1 is attributed to its soft lattice, accommodating nitrate with minimal expansion.
  • The rigid lattice of the 3R1 polytype requires significant expansion, hindering nitrate storage.

Conclusions:

  • Layer-stacking sequence is a critical factor in determining nitrate storage in LDHs.
  • The soft lattice structure of the 2H1 polytype is advantageous for efficient anion storage.
  • Findings provide insights for designing materials with tailored anion-host interactions for energy storage applications.