Architecture of crystal structures from square planes
Related Experiment Video
Updated: Feb 23, 2026
On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature
Published on: March 11, 2022
1Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany. j.hauck@fz-juelich.de
Abstract:
The crystal structures of ordered b.c.c. (body-centered cubic), f.c. c. (face-centered cubic) or primitive cubic alloys AxBy and related NaCl, ZnS or CaF(2) derivative structures are characterized by the self-coordination numbers T(1), T(2) of the A atoms with A atoms. Structures with identical T(1) and T(2) values for all A atoms are at the corners of T(1) and T(2) structure maps, and can be analyzed for attractive or repulsive interactions of A atoms. Most observed structures are at the borders of the structure map and can be obtained by approximately 10 different combinations of structural units. The different combination mechanisms explain e.g. the shear structures of CuAu II or Nb(2)O(5) and the occurrence of vacancies in NaCl-related structures like NbO.
More Related Videos
06:35Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
08:46Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity
Published on: January 15, 2014
Related Concept Videos
02:46Crystal Field Theory - Tetrahedral and Square Planar 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,...
02:42Ionic Crystal Structures
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...
02:22Structures of Solids
02:18X-ray Crystallography
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
02:33Lattice Centering and Coordination Number
Types of Unit Cells
Imagine taking a large number of identical...
02:58Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...