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Updated: Jun 4, 2025

Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
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在Ba4中的晶体结构,离子占用和相位过渡,LiNa1-) 2Nb10O30四角形青铜中

Nora Statle Løndal1, Benjamin A D Williamson1, Ola G Grendal1

  • 1Department of Material Science and Engineering, NTNU Norwegian University of Science and Technology, Trondheim 7491, Norway.

Inorganic chemistry
|January 3, 2025
PubMed
概括

本研究探讨了两个四角形青铜 (TTB) 结构之间的固体溶液,揭示了结构相位过渡及其对功能性质的影响. 了解这些组成结构关系对于设计新的TTB材料至关重要.

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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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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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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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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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