In a unit cell containing X2+, Y3+ and Z2‰ÛÒ where X2+ occupies 1/8th of tetrahedral voids, Y3+ occupies 1/2 of octahedral voids and Z2‰ÛÒ forms ccp structure. Then formula of compound is
X2Y4Z
XY2Z4
X4YZ2
XY3Z4