crystal structure
o
Crystallography:
It is that branch of science in which the internal structures of crystals,
their properties, external or internal symmetries of crystals are studied.
o
Various terms
associated with Crystallography.
(i)
Crystal
(ii)
Structure:
The structure implies the arrangement of the atoms within a crystal.
Other important terms – Space
lattice, Unit cell, Atomic planes, lattice parameters, Miller indices etc.
o
Classification of
solids:
1. Crystalline: If the atoms or
molecules in a solid are arranged in
regular fashion, then it is known as
Crystalline solid.
2. Amorphous: When the atoms or molecules in a solid are arranged in
an irregular fashion, then it is
known as amorphous solid.
o
Polycrystalline
Materials: When in a
solid material is build up of a large number of small interlocking crystals or
grains it is called polycrystalline.
o
Space lattice
& Crystal lattice:
The atoms arrange themselves in distinct pattern in space called a space
lattice. It can be considered as an infinite array of points in space, so
arranged that it divides space into equal volumes with no space excluded. In a
space lattice every point has identical surroundings.
o
Unit cell &
its lattice parameters:
It is the smallest group of atoms possessing the symmetry of the crystal.
for more click on the link given below
http://en.wikipedia.org/wiki/Crystallography
for more click on the link given below
http://en.wikipedia.org/wiki/Crystallography
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