11 lines
266 B
Plaintext
11 lines
266 B
Plaintext
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Each S is bonded to 3 Fe and 1 S. The S-S distance is
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||[x,x,x] - [1-x,1-x,1-x]||.
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The Fe-S distance is
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||[x-1/2,x-1/2,x]||.
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Assume all bond lengths are equal.
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3*(2x-1)^2 = 2*(x-1/2)^2 + x^2
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18x^2-20x+5 = 0
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x = [10-sqrt(10)]/18
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= 0.37987
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