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kolleamm
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Also does it make a better core for an electromagnet than iron does?
from wikikolleamm said:Also does it make a better core for an electromagnet than iron does?
Neodymium is a metal which is ferromagnetic (more specifically it shows antiferromagnetic properties), meaning that like iron it can be magnetized to become a magnet, but its Curie temperature (the temperature above which its ferromagnetism disappears) is 19 K (−254 °C), so in pure form its magnetism only appears at extremely low temperatures.[5] However, compounds of neodymium with transition metals such as iron can have Curie temperatures well above room temperature, and these are used to make neodymium magnets.
Also does it make a better core for an electromagnet than iron does?
Thanks a lot! That pretty much sums it all up.davenn said: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
Hmm, now I understand why these very strong permanent magnets have to be encased in nickel.davenn said:no, [neodymiun] oxidises VERY quickly, even when mixed with iron and boron
it's also toxic and flammable at temps as low as 150C.
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 nicelystrangerep said:Hmm, now I understand why these very strong permanent magnets have to be encased in nickel.