Possible giant diamagnetism in BiPbSnIn ?
Conundrum, Tue Jul 03 2007, 07:00PMHi all.
I think I may have stumbled across something truly weird.
Was mixing up another batch of low melting point metal for removing IC's.
For various reasons (impure lead and/or crystalline bismuth) this batch had a LOT of impurities which showed up as annoying black/silvery crystals in the melt.
Did the usual trick of removing all the crud by scraping the nearly crystallised alloy with a spoon end, and saved this alloy. Then re-melted to salvage what I could (indium=$$$)
So I ended up with about a quarter gram of black and silver flakes which were basically useless. Just to see what happened I got a strong neodymium magnet and checked to see if any of the flakes stuck.
Was very surprised to see that some did- not only that but upon further cooling (the flakes were pretty hot still) more stuck.
So far I have about 10 flakes varying in size from 0.2mm to 2mm, all of which stick to a magnet even though none of the components should be magnetic.
Reckon I am onto something here?
-A
Re: Possible giant diamagnetism in BiPbSnIn ?
..., Tue Jul 03 2007, 08:10PM
well, if they stick to the magnet they are not diamagnetic (by definition...), I would guess that you had some Fe, or a little bit of a Nd magnet, or something similar in the mix.
..., Tue Jul 03 2007, 08:10PM
well, if they stick to the magnet they are not diamagnetic (by definition...), I would guess that you had some Fe, or a little bit of a Nd magnet, or something similar in the mix.
Re: Possible giant diamagnetism in BiPbSnIn ?
ragnar, Wed Jul 04 2007, 08:37AM
I believe Andre meant 'paramagnetism'. Isn't Bismuth paramagnetic under some circumstances anyway?
ragnar, Wed Jul 04 2007, 08:37AM
I believe Andre meant 'paramagnetism'. Isn't Bismuth paramagnetic under some circumstances anyway?
Re: Possible giant diamagnetism in BiPbSnIn ?
Swany, Tue Jul 17 2007, 05:06PM
Bismuth is the most diamagnetic of all elements, meaning it opposes magnetic fields. This is due to the unfilled 6p orbitals I would assume, there are 3 unpaired electrons in those orbitals.
However, some bismuth alloys are magnetic. MnBi is an alloy known as 'Bismanol', the navy uses it for its high coercive force.
Swany, Tue Jul 17 2007, 05:06PM
Bismuth is the most diamagnetic of all elements, meaning it opposes magnetic fields. This is due to the unfilled 6p orbitals I would assume, there are 3 unpaired electrons in those orbitals.
However, some bismuth alloys are magnetic. MnBi is an alloy known as 'Bismanol', the navy uses it for its high coercive force.
Re: Possible giant diamagnetism in BiPbSnIn ?
Bored Chemist, Tue Jul 17 2007, 05:13PM
There's a nickel iron alloy with pretty much the same thermal expansion as glass. (called kovar IIRC) the IC industry uses it to make the pins on ICs ( I don't know why- perhaps they just haven't changed the mix since they were making valves).
Bits of that in the mix are a lot more likely than ferromagnetic mixtures of non magnetic materials.
Having said that, some heusler alloys are magnetic even though their components aren't.
Bored Chemist, Tue Jul 17 2007, 05:13PM
There's a nickel iron alloy with pretty much the same thermal expansion as glass. (called kovar IIRC) the IC industry uses it to make the pins on ICs ( I don't know why- perhaps they just haven't changed the mix since they were making valves).
Bits of that in the mix are a lot more likely than ferromagnetic mixtures of non magnetic materials.
Having said that, some heusler alloys are magnetic even though their components aren't.
Re: Possible giant diamagnetism in BiPbSnIn ?
EEYORE, Tue Jul 17 2007, 05:15PM
I beleive pyrolytic graphite is 15 times more diamagnetic than bismuth. I have some, and it will levitate above strong magnets.
Matt
EEYORE, Tue Jul 17 2007, 05:15PM
Swany wrote ...
Bismuth is the most diamagnetic of all elements, meaning it opposes magnetic fields. This is due to the unfilled 6p orbitals I would assume, there are 3 unpaired electrons in those orbitals.
However, some bismuth alloys are magnetic. MnBi is an alloy known as 'Bismanol', the navy uses it for its high coercive force.
Bismuth is the most diamagnetic of all elements, meaning it opposes magnetic fields. This is due to the unfilled 6p orbitals I would assume, there are 3 unpaired electrons in those orbitals.
However, some bismuth alloys are magnetic. MnBi is an alloy known as 'Bismanol', the navy uses it for its high coercive force.
I beleive pyrolytic graphite is 15 times more diamagnetic than bismuth. I have some, and it will levitate above strong magnets.
Matt
Re: Possible giant diamagnetism in BiPbSnIn ?
Spedy, Sat Aug 25 2007, 04:49PM
Pyrolytic graphite is just a certain crystal formation of carbon, not an element. Bismuth is the most diamagnetic Element yet to be discovered.
On topic:
Thats pretty cool. I haven;t done anything with liquid metal, but I've read lots about it.
Spedy, Sat Aug 25 2007, 04:49PM
mattrg2 wrote ...
I beleive pyrolytic graphite is 15 times more diamagnetic than bismuth. I have some, and it will levitate above strong magnets.
Matt
Swany wrote ...
Bismuth is the most diamagnetic of all elements, meaning it opposes magnetic fields. This is due to the unfilled 6p orbitals I would assume, there are 3 unpaired electrons in those orbitals.
However, some bismuth alloys are magnetic. MnBi is an alloy known as 'Bismanol', the navy uses it for its high coercive force.
Bismuth is the most diamagnetic of all elements, meaning it opposes magnetic fields. This is due to the unfilled 6p orbitals I would assume, there are 3 unpaired electrons in those orbitals.
However, some bismuth alloys are magnetic. MnBi is an alloy known as 'Bismanol', the navy uses it for its high coercive force.
I beleive pyrolytic graphite is 15 times more diamagnetic than bismuth. I have some, and it will levitate above strong magnets.
Matt
Pyrolytic graphite is just a certain crystal formation of carbon, not an element. Bismuth is the most diamagnetic Element yet to be discovered.
On topic:
Thats pretty cool. I haven;t done anything with liquid metal, but I've read lots about it.
Re: Possible giant diamagnetism in BiPbSnIn ?
Conundrum, Sun Oct 28 2007, 05:07PM
Try putting some in an ultrasonic field. It forms "ripples" :)
Setting up a standing wave and then slowly cooling the metal would probably result in some very interesting formations, a bit like ferrorfluid on a speaker.
(btw the 59c alloy works well for this, Email me for a free sample.)
-A
Conundrum, Sun Oct 28 2007, 05:07PM
Try putting some in an ultrasonic field. It forms "ripples" :)
Setting up a standing wave and then slowly cooling the metal would probably result in some very interesting formations, a bit like ferrorfluid on a speaker.
(btw the 59c alloy works well for this, Email me for a free sample.)
-A
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