Class 12th "SOLID STATE"

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CUBIC UNIT CELL
•  Relation between edge length and radius :
•  Edge length of unit cell is measured from one corner lattice point to adjacent corner. 
•  all the constituent particles are considered as solid sphere with radius 'r'.

SIMPLE CUBIC UNIT CELL
•  Relation between edge length and radius :
•  In this unit cell the adjacent corner atoms touch each other. 
•  [ a = 2x ]

BODY-CENTRED CUBIC UNIT CELL
•  Relation between edge length and radius:
•  In this unit cell the adjacent corner atoms do not touch each others. 
•  all corner touch the atom at body centred. 
•  [ Fd = √2 a ]


FACE-CENTRED CUBIC UNIT CELL
•  In this unit cell the adjacent corner atoms do not touch each other. 
•  all atoms touch the atom at face centred. 

  

                      THANK YOU  ! 
                                ☺

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