Basal plane | Wikipedia audio article
Channel: wikipedia tts
Date: 02/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Crystal_structure


00:01:18 1 Unit cell
00:02:37 1.1 Miller indices
00:04:29 1.2 Planes and directions
00:06:40 1.2.1 Cubic structures
00:08:39 1.3 Interplanar spacing
00:17:17 2 Classification by symmetry
00:18:18 2.1 Lattice systems
00:19:20 2.1.1 Bravais lattices
00:20:22 2.2 Crystal systems
00:21:14 2.2.1 Point groups
00:22:19 2.3 Space groups
00:22:58 3 Atomic coordination
00:23:25 3.1 Close packing
00:26:21 4 Grain boundaries
00:28:40 5 Defects and impurities
00:29:45 6 Prediction of structure
00:33:37 7 Polymorphism
00:36:57 8 Physical properties



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SUMMARY
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In crystallography, crystal structure is a description of the ordered arrangement of atoms, ions or molecules in a crystalline material. Ordered structures occur from the intrinsic nature of the constituent particles to form symmetric patterns that repeat along the principal directions of three-dimensional space in matter.
The smallest group of particles in the material that constitutes this repeating pattern is the unit cell of the structure. The unit cell completely reflects the symmetry and structure of the entire crystal, which is built up by repetitive translation of the unit cell along its principal axes. The translation vectors define the nodes of the Bravais lattice.
The lengths of the principal axes, or edges, of the unit cell and the angles between them are the lattice constants, also called lattice parameters or cell parameters. The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space may be described by the 230 space groups.
The crystal structure and symmetry play a critical role in determining many physical properties, such as cleavage, electronic band structure, and optical transparency.