In a solid atom x form fcc lattice and y atom occupy octahedral void if all atom one of face diagonal r removed find formula? plz explain with diagram?

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In a solid atom x form fcc lattice and y atom occupy octahedral void if all atom one of face diagonal r removed find formula? plz explain with diagram?

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In a solid atom x form fcc lattice and y atom occupy octahedral void i...

In FCC unit cell,

X atoms are occupy FCC packing and Y atoms occupy octahedral voids.

If the all the atoms at one diagonal plane are missing, then4 corner and two face centered Y atoms are missing while 1 body centered and two edge centered X atoms are missing.

contribution of Y at corners = 1/8�4= 0.5

contribution of Y at faces = 1/2 �4 = 2

Total Y atoms = 2.5

Now,

Contribution of X at the edges = 1/4�8=2

The formula will be X2.5Y2 or X5Y4.

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