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what happens when alpha iron change to gamma iron ? a. shrink b. expand c. does...

what happens when alpha iron change to gamma iron ?
a. shrink
b. expand
c. does not shrink or swell
d. stronger magnetism
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Answer #1

Alpha Iron has a Body Centered Cubic (BCC) structure in which one cubic lattice has 2 atoms. On the other hand Gamma Iron has a Face Centered Cubic (FCC) structure in which one cubic lattice has 4 atoms of Iron in it.

We know that Packaging Efficiency is higher for FCC structure than BCC and thuse FCC structure will have more density.
The excess density will occur due to the decrease in volume as mass remains constant. Hence there will be a shrinkage in volume.

Thus Option a. Shrink in correct.

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