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Is neodymium naturally magnetic?

  1. Jul 4, 2018 #1
    Also does it make a better core for an electromagnet than iron does?
     
  2. jcsd
  3. Jul 4, 2018 #2

    davenn

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    from wiki

    note it is only naturally magnetic at extremely low temperatures
    This is why Nd magnets are a mix of Nd Fe ( Iron) and B (Boron)
    Also note that Nd does not occur naturally as a metal, it needs to be refined out of the ores that it is present in

    and to answer your specific Q ...
    no, it oxidises VERY quickly, even when mixed with iron and boron
    it's also toxic and flammable at temps as low as 150C



    Dave

    edited to fix spelling and grammar
     
  4. Jul 4, 2018 #3
    Thanks a lot! That pretty much sums it all up.
     
  5. Jul 5, 2018 #4

    strangerep

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    Hmm, now I understand why these very strong permanent magnets have to be encased in nickel.

    (I bought one some years ago and it still seems to be as strong as ever.)
     
  6. Jul 5, 2018 #5

    davenn

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    Yup, I have a cylindrical one here (1/2 " dia. 1" long) that a little of the nickel plating has peeled off and the Nd mix below is oxidising nicely

    D
     
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