Question
Fri August 31, 2012 By: Suresh C C
 

2. In a solid 'AB' having NaCl structure atoms occupy the corners of the cubic unit cell. If all the face centered atoms along one of the axis are removed then the resultant stoichiometry of the solid is ___________?

Expert Reply
Wed September 05, 2012
it is given that, A occupies  corners and face center of unit cell and it's like NaCl structure.. When no atoms is removed then , 

 number of atoms of A in the unit cell = (1/8 * 8) + (1/2* 6) = 4

 Number of atoms of B which occupies octahedral voids =  1+ ( 1/4 * 12) = 4 

Therefore formula  = A4B4 = AB ( Like NaCl)
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