Suppose Approximately One-Third of the Octahedral Holes in the Fcc

question 38

Multiple Choice

Suppose approximately one-third of the octahedral holes in the fcc lattice of iron (r = 126 pm) is occupied by a carbon atom (r = 77 pm) .Which of the following is its probable composition?

• A)FeC.
• B)FeC₃.
• C)Fe₃C.
• D)Fe₃C₃.
• E)Carbon cannot occupy the octahedral holes in the iron crystal lattice.

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