crystal axis - определение. Что такое crystal axis
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Что (кто) такое crystal axis - определение

UNIQUE ARRANGEMENT OF ATOMS OR MOLECULES IN A CRYSTALLINE LIQUID OR SOLID
Crystalline structure; Mineral structures; Mineral structure; Crystallographic structure; Crystal lattice structure; Crystal structures; Crystal pattern; Crystal Structure; Assymetric unit; Lattice structure; Basis (crystal structure); Crystal symmetry; Crystalline form; Crystal structure of a mineral; Types of crystals; Basal plane; Basal Plane; Principal axis (crystallography); Asymmetric unit; Crystal axis; Crystal packing; Crystal structure determination
  • Monoclinic, centered
  • Dense crystallographic planes
  • Cubic, body-centered
  • Cubic, face-centered
  • Cubic, simple
  • Hexagonal
  • Planes with different Miller indices in cubic crystals
  • Monoclinic, simple
  • Orthorhombic, base-centered
  • Orthorhombic, body-centered
  • Orthorhombic, face-centered
  • Orthorhombic, simple
  • β-quartz]], [[tridymite]], [[cristobalite]], [[coesite]], and [[stishovite]].
  • Rhombohedral
  • table salt]] (sodium in purple, chlorine in green)
  • Tetragonal, body-centered
  • Tetragonal, simple
  • Triclinic

crystal axis         
¦ noun each of three axes used to define the edges of the unit cell of a crystal.
Optic axis of a crystal         
BIREFRINGENCE-FREE DIRECTION OF LIGHT TRANSMISSION
Extraordinary axis; Optically biaxial crystal
An optic axis of a crystal is a direction in which a ray of transmitted light suffers no birefringence (double refraction). An optical axis is a direction rather than a single line: all rays that are parallel to that direction exhibit the same lack of birefringence.
Screw axis         
  • The [[Boerdijk–Coxeter helix]] is an example of a screw axis symmetry that is nonperiodic.
  • 3<sub>1</sub> screw axis in crystal structure of [[tellurium]]
LINE THAT IS SIMULTANEOUSLY THE AXIS OF ROTATION AND THE LINE ALONG WHICH TRANSLATION OF A BODY OCCURS
Screw axes; Helical axis; Instantaneous helical axis; Twist axis; Screw displacement; Screw operation
A screw axis (helical axis or twist axis) is a line that is simultaneously the axis of rotation and the line along which translation of a body occurs. Chasles' theorem shows that each Euclidean displacement in three-dimensional space has a screw axis, and the displacement can be decomposed into a rotation about and a slide along this screw axis.

Википедия

Crystal structure

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.