Silver iodide crystallizes in the cubic close packed zinc sulphide structure. Assuming that ions occupy the lattice points, what fraction of the tetrahedral sites is occupied by`Ag^+` ions?

If the unit cell of a mineral has cubic close packed array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction of tetrahedral holes occupied by magnesium ions, m and n, respectively, are

What is the radius of ratio (r^+/r^-) for an ion to occupy: tetrahedral void.

What is the co-ordination number of an atom or ion occupying a Tetrahedral hole ?

In a normal spinel structure O^(2-) ions form fcc packing and 1/8 of the tetrahedral sites are occupied by divalent metal, A^(2+) ions and half of the octahedral sites are occupied by trivalent metal B^(3+) ions, what is the ratio of the tetrahedral/octahedral sites: occupied in spinel structure.

In a structure, A atoms have fcc arrangement B atoms occupy all the tetrahedral sites and C atoms occupy half the octahedral sites. what is the formula of the compound ?

In the spinel structur, oxides ions are cubical-closet packed whereas 1/8th of tetrahedral voids are occupied by A^(2+) cation and 1/2 of octahedral voids are occupied by B^(+) cations. The general formula of the compound having spinel structure is:

Ferric oxide crystallizes in a hexagonal close pakced array of oxide ions with two out of every three octahedral holes occupied by ferric ions. Derive the formula of the ferric oxide.

In a solid, oxide ions are aranged in ccp. One sixth of the tetrahedral voids and occupied by the cations A and one third of the octahedral voids and occupied by the cations B. what is the formula of the compound?

A spinel is an important class of oxide consisting two types of metal ions with the oxide ions arranged in ccp layers . The normal spinel has one -eight of the tetrahedral holes occupied by one type of metal ions and one- half of the octahedral holes occupied by another type of metal ion. Such a spinel is formed by Mg^(2+), Al^(3+) and O^(2-) . The neutrality of the crystal is being maintained. The formula of the spinel is :