The Ca2+ and F−are located in CaF2 crystal, respectively at face centred cubic lattice points and in:
A
tetrahedral voids
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B
half of tetrahedral voids
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C
octahedral voids
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D
half of octahedral voids
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Solution
The correct option is A tetrahedral voids The Ca2+ and F− are located in CaF2 crystal respectively at face-centred cubic lattice points and in tetrahedral voids.
The calcium fluoride structure is also called a fluorite structure. It is 8: 4 arrangement, the coordination number of Ca2+ and F− ions is 8 and 4 ions respectively.