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4hv.org :: Forums :: Chemistry
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MgB2

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Conundrum
Thu May 08 2014, 04:53AM Print
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Hi all.
As part of my ongoing research I need to make this from scratch.

So far I've determined that boron mixed with magnesium would probably work if "fired" in a domestic microwave but is there a safer method please?

Ideally the shape change should be minimal as I need to stack Y263 and MgB2 disks.
Thanks!
A
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ohnos
Tue May 27 2014, 05:45AM
ohnos Registered Member #42726 Joined: Fri Jan 10 2014, 11:06AM
Location:
Posts: 1

Mg + B2
Adiabatic reaction temp: 1706K
Heat of reaction: 479cal/g

ref: 24th int.pyro.sem 1998

Ive tried TiB but couldnt get a reaction and its supposedly much more energetic, you'd need an inert atmosphere regardless.
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Conundrum
Fri May 30 2014, 07:51PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Thanks!


EDIT: Got Mg, would argon (cheap, £30 or so per cylinder) do?

I'd need to use a microwave and inert glass frit to seal the tube then pump it down and encase in a susceptor such as silicon carbide powder, in a fire cement casing with some sort of thermal feedback.

EDIT: Best to use a proper crucible, tried it with ZnGaS (Zn+GaO+S) and it broke spectacularly.


-A
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