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

question 35

Multiple Choice

Suppose that approximately one-third of the octahedral holes in the fcc lattice of iron (Fe; r= 126 pm) is occupied by a carbon atom (C; 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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