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What is the 5...

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What is the 5th and 6th coordination number of a compound xy where x are in octahedral voids and y are fcc lattice

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Q. There are three ionic compounds, first compound has fcc lattice of anions and cations are present in all tetrahedral voids, second compound has fcc lattice of anions and cations are present in all octahedral voids and the third compound has simple cubical lattice in which cubical void is occupied by cation, then the order of packing efficiency of these will be :

Q. In a compound, oxides ions form fcc lattice, whereas

\frac{1}{4} t h

of tetrahedral voids are occupied by cations

A^{2 +}

\frac{1}{8} t h

of octahedral voids are occupied by cations

B^{3 +}

ions. The simplest formula of the compound is

Q. Oxide ion forming a fcc lattice in which

F e^{2 +}

ions are occupying

1 / 8^{t h}

of tetrahedral void and

F e^{3 +}

ions are occupying

\frac{1}{2}

of the octahedral void. What will be the formula of the compound?

Q. In a CCP structure of compound

X Y, X

atoms are present at octahedral voids. Calculate the number of nearest neighbours upto

6 t h C . N .

X

atom located at body centre.

The number of octahedral voids per lattice site in a FCC lattice is_______

(Rounded off to the nearest integer)

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