Crystal Planes: Definition & Meaning

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SUMMARY

Crystal planes are defined as planes passing through lattice points in a crystal structure, which consists of a lattice and a basis. These planes represent a regular arrangement of atoms, where the diametral planes of spheres representing the atoms are coplanar. Despite the idealized structure, real crystals may contain missing atoms, dislocations, and interstitial atoms, affecting the uniformity of these planes. Understanding crystal planes is essential for grasping the geometric relationships within crystalline materials.

PREREQUISITES
  • Understanding of crystal structure concepts, including lattice and basis.
  • Familiarity with atomic arrangements and geometric relationships in materials science.
  • Knowledge of dislocations and interstitial atoms in crystalline solids.
  • Basic grasp of crystallography terminology and definitions.
NEXT STEPS
  • Research the concept of lattice points in crystallography.
  • Study the role of dislocations in crystal defects and their impact on material properties.
  • Explore the geometric arrangement of atoms in various crystal systems.
  • Learn about the significance of crystal planes in X-ray diffraction techniques.
USEFUL FOR

Materials scientists, crystallographers, and students studying solid-state physics or chemistry will benefit from this discussion on crystal planes and their implications in crystal structure analysis.

Hymne
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I think I understand the meaning and definition of the concepts of basis, cells, primitivecells and lattice, and so on. But could somebody please give me a short and consistent definition on crystal planes?
For example on which level do you mean when you talk about these planes? Are they planes of basis or planes of ions inside basis?
 
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Crystal planes refer to 'planes of atoms' with some regular structure or array, as one would observe if the diametral planes of spheres representing that atoms were coplanar, i.e. they have the same geometric arrangement/relationship.

In reality though, there are missing atoms (and dislocations) and interstitial atoms. See - http://en.wikipedia.org/wiki/Dislocation
 
Crystal structure = lattice + basis
Crystal plane = plane passing through lattice points
 
All lattice points are on a series of planes(Crystal plane),Crystal planes are equally separate with each other.
 

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