GALILEAN TRANSFORMATIONS

UNIT CELL AND LATTICE PARAMETERS

Unit cell In Crystals the arrangement of particles is described with three dimensional geometrical parallelepiped structure. The unit cell is defined as the smallest size of parallelepiped structure with minimum number of atoms. In a unit cell there are 6 faces and 8 corners. So 8 atoms are required to form a unit cell and all the 8 atoms are located at the 8 corners each. Lattice Lattice is defined as a three dimensional array of atoms. It describes the size and shape of the unit cell. Parameters of a unit cell A unit cell is described by six parameters. These parameters are three dimensions and the angles between them . The Dimensions of unit cell along three axes of a unit cell are represented by (a, b ,c) . The angle between b and c is represented by α, between a and c by β and between a and b by γ. we can identify the structure of crystal by knowing the parameters of unit cell. Properties of unit cell : 1. Unit cell is...

BRAVIAS CRYSTALS -7 CRYSTAL SYSTEMS

Bravias crystals : There are 7 different basic crystal lattices according to the dimensions (a,b,c) and their angles( ⍺ , 𝛽, ℽ ) of unit cell which are called Bravias crystals. 1 Cubic crystal system : a=b=c and α=β=γ=90 example : NaCl available systems are simple cubic, face centered and body centered cubic systems 2 Tetragonal a=b ≠ c and α=β=γ=90 example SiSO4 available systems : simple and body centered cubic systems. 3 Orthorhombic a ≠ b ≠c and α=β=γ=90 example: BaSO4 available systems are simple, body centered ,face centered and base centered cubic systems. . 4 Monoclinic (rhombohedral ) a ≠ b ≠c and α=β=90γ=120 example: Na2So4...

MEISNER EFFECT ON SUPERCONDUCTORS

Meissner effect.

PHYSICS

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