Well done Russ ! Good to know this ! great experiment ! What kind of coil was this ? How many turns and how big was the wire inside the coil ? Many thanks. Regards, Stefan.
Magnetite has a so-called inverse spinel structure. The cubic unit cell corresponds to Fe24O32. Oxide ions are cubic closest packed, so there are 32 octahedral and 64 tetrahedral holes in the structure. There are three kinds of Fe present - Fe3+ in tetrahedral holes (1/8 of the tetrahedral holes filled); Fe3+ in octahedral holes (1/4 of the octahedral holes filled); and Fe2+ in octahedral holes (1/4 of the octahedral holes filled). The magnetic properties reflect the splitting of the 5 d orbitals, as shown below for octahedral and tetrahedral coordination of the Fe atoms by oxygen atoms. The small splittings between the two sets of d orbitals caused by oxide ligands means that all Fe3+ ions have five unpaired electrons and all Fe2+ ions have four unpaired electrons. As sketched below, the Fe3+ and Fe2+ions that are in octahedral sites are ferromagnetically coupled through what is called a double exchange mechanism.
+Stefan Hartmann , i could not tell you much about the coil. i need to take measurements but could not pull the coil apart. This is a standard coil for this application. ~Russ
Hi Russ the temperature where it loses it's magnetic force is the Currie temp. For Neodymium magnets it's about 320 deg. Celcius. Over 900 deg will change the structure of the magnet making it permanently demagnetized...but I suspect you know all this...I tried melting one using induction heating instead of flame but although it melted, you could not get the molten material to flow...not even close..It was done in a vacuum to prevent oxidation but still no good.
I thought we already knew that heat can be a demagnetizer and that the item could be remagnetized. I did catch the part of the experiment that you were trying to see if you could reattain the original strength. - - - - You know a lot more about that stuff than ever will. I just watch along and ponder.
Nice, but is it feasible using more easily obtainable equipment like a welding transformer? The industrial magnetizer you used for this test somehow doesn't look like something most people would be able to acquire, even less afford...
What if you put an already magnetized neodymium into the impulse generator over and over? Can you make the magnet slightly stronger each time? Also, would you be willing to make and sell me a couple ring magnets where the magnetization would be produced by sending the capacitor discharge through a thick wire or copper rod that is going through the middle of the ring magnet? I'm looking for something that would have an outer diameter 1/2" or less and and inner diameter of 1/4" or less and a height of at least 1/8". It's my opinion that the wire or rod going through the center of the magnet would need to be insulated, otherwise the electricity might partially conduct from the rod to the magnet nickel plate and travel around the outside of the magnet which would inhibit the magnetic field I'm after.
next time, try to heat up the magnet, and then , when is red hot put it in the magnetizer, and let it cool down in there maby, just maby this will make a stronger magnet
Loved how the cables jumped when you fired it. RAW POWER!!! Caps are so much fun.
Well done Russ ! Good to know this ! great experiment ! What kind of coil was this ?
How many turns and how big was the wire inside the coil ? Many thanks.
Regards, Stefan.
Magnetite has a so-called inverse spinel structure. The cubic unit cell corresponds to Fe24O32. Oxide ions are cubic closest packed, so there are 32 octahedral and 64 tetrahedral holes in the structure. There are three kinds of Fe present - Fe3+ in tetrahedral holes (1/8 of the tetrahedral holes filled); Fe3+ in octahedral holes (1/4 of the octahedral holes filled); and Fe2+ in octahedral holes (1/4 of the octahedral holes filled).
The magnetic properties reflect the splitting of the 5 d orbitals, as shown below for octahedral and tetrahedral coordination of the Fe atoms by oxygen atoms.
The small splittings between the two sets of d orbitals caused by oxide ligands means that all Fe3+ ions have five unpaired electrons and all Fe2+ ions have four unpaired electrons. As sketched below, the Fe3+ and Fe2+ions that are in octahedral sites are ferromagnetically coupled through what is called a double exchange mechanism.
+Stefan Hartmann , i could not tell you much about the coil. i need to take measurements but could not pull the coil apart. This is a standard coil for this application. ~Russ
I seen a sine wave.
Hi Russ
the temperature where it loses it's magnetic force is the Currie temp. For Neodymium magnets it's about 320 deg. Celcius. Over 900 deg will change the structure of the magnet making it permanently demagnetized...but I suspect you know all this...I tried melting one using induction heating instead of flame but although it melted, you could not get the molten material to flow...not even close..It was done in a vacuum to prevent oxidation but still no good.
wild quess, buying off the shelf magnets, unmagnetizing them and then re magnetizing them with pixels?
Thanks Russ good to know I will file that one away for future reference
Heat demagnetizing used often when disassembling DC-motors.
Do you are the resonance sound when you approach the "demagnetized" magnet from the others ? Amazing 1:20
I thought we already knew that heat can be a demagnetizer and that the item could be remagnetized. I did catch the part of the experiment that you were trying to see if you could reattain the original strength. - - - - You know a lot more about that stuff than ever will. I just watch along and ponder.
It sounds like it will come in handy, cool
Eldaine Dacosta yeah lots more to come... ~Russ
Hold the torch against the magnet until it falls off. I was wondering how to tell.
Nice, but is it feasible using more easily obtainable equipment like a welding transformer? The industrial magnetizer you used for this test somehow doesn't look like something most people would be able to acquire, even less afford...
rwgresearch.com/open-projects/10000j-cap-bank/
rwgresearch.com/open-projects/making-poly-magnets-cmr/
~Russ
Russ! Efficient use of video time! 5ea. .$05 bites > 1 ea. $.25 bite.
I like it!
OgMandin0 hehehe :) but there will be 25 more? lol ~Russ its all the same length in the end haha good stuff! ~Russ
What if you put an already magnetized neodymium into the impulse generator over and over? Can you make the magnet slightly stronger each time? Also, would you be willing to make and sell me a couple ring magnets where the magnetization would be produced by sending the capacitor discharge through a thick wire or copper rod that is going through the middle of the ring magnet? I'm looking for something that would have an outer diameter 1/2" or less and and inner diameter of 1/4" or less and a height of at least 1/8". It's my opinion that the wire or rod going through the center of the magnet would need to be insulated, otherwise the electricity might partially conduct from the rod to the magnet nickel plate and travel around the outside of the magnet which would inhibit the magnetic field I'm after.
next time, try to heat up the magnet, and then , when is red hot put it in the magnetizer, and let it cool down in there maby, just maby this will make a stronger magnet
The next question is can you get it higher.