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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.
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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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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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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Buckle-Layered, Decorated Square-Kagome System KCu7BiO4(SO4)5.

Larisa V Shvanskaya1,2, Tatiana D Bushneva1, Dmitriy A Chareev3

  • 1Moscow State University, Moscow 119991, Russia.

Inorganic Chemistry
|December 18, 2025
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Summary
This summary is machine-generated.

We synthesized KCu7BiO4(SO4)5, a new decorated square-kagome material. This compound exhibits complex magnetic behavior with long-range order at 12 K, indicating significant magnetic frustration.

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Magnetism

Background:

  • The family of decorated square-kagome systems is limited, with few known natural or synthetic examples.
  • Understanding the structure-property relationships in these systems is crucial for discovering new magnetic materials.

Purpose of the Study:

  • To synthesize and characterize a novel buckle-layered compound, KCu7BiO4(SO4)5.
  • To investigate the crystal structure and magnetic properties of this new material.
  • To explore the magnetic interactions within the square-kagome network.

Main Methods:

  • Gas-transport synthesis for material preparation.
  • X-ray diffraction for crystal structure determination.
  • Magnetic property measurements (temperature-dependent susceptibility).
  • Density functional theory (DFT) calculations for exchange interactions.

Main Results:

  • KCu7BiO4(SO4)5 was successfully synthesized and its crystal structure determined in the tetragonal space group P4/ncc.
  • The compound exhibits a square-kagome motif with a unique arrangement of copper polyhedra.
  • Magnetic measurements revealed long-range antiferromagnetic order at a Neel temperature (TN) of 12 K.
  • A high frustration ratio (F ≥ 18) was observed, suggesting strong competition between antiferromagnetic interactions and low dimensionality.

Conclusions:

  • KCu7BiO4(SO4)5 represents a new addition to the decorated square-kagome family with distinct structural features.
  • The material displays significant magnetic frustration, driven by competing exchange interactions and low dimensionality.
  • DFT calculations provide insights into the pathways of magnetic exchange interactions in this complex system.