When Fe heats up it changes its crystal structure from BCC to FCC at 910 degrees celsius and then back to BCC at 1390 degrees celsius then it turns into a liquid at 1536+ degrees celsius. At which of those crystal structures is it magnetic and why?
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dear friend, well, generally Fe is magnetic in BCC crystal structure. so it is magnetic from the environment temperature until 910 and then it changes the structure in to FCC. as you may know, the magnetic property is because of the atoms spining direction. and when iron is in BCC form , this spins can unify and bring the magnetic properties but with the temperature going higher and higher , the thermal energy makes this spines out of their order, therefore the magnetic field can not be obtained. for more info about this matter you can check this : inside.mines.edu/meberhar/MTG/down_load. I hope that helps
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