DFliyerz
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Carbides
Carbides... carbides are freakin' weird. Some make methane, some make acetylene, some make propyne... what? And they're so simple too! Anyways: are
methanides, acetylides, and sesquicarbides the only types of saline carbides? What's the explanation for these strange reactions? Is it possible to
make carbides at non-crazy temperatures?
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blogfast25
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| Quote: | Copper(I) acetylide can be prepared by passing acetylene through a water solution of copper(I) chloride. Silver acetylide can be obtained in a similar
way from silver nitrate.
http://en.wikipedia.org/wiki/Acetylide
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But apart from these it's mostly high temperature chemistry, I think.
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DFliyerz
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Actually, Wikipedia says something about making aluminum carbide from silicon carbide and aluminum, but it's unbelievably vague.
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blogfast25
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Quote: Originally posted by DFliyerz  | | Actually, Wikipedia says something about making aluminum carbide from silicon carbide and aluminum, but it's unbelievably vague.
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I hope you realise just how inert SiC is. We're talking high T chemistry again, I think.
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IrC
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Since your on the subject can anyone explain why my name is unobtanium. I tried for years but Iridium will not form a carbide, only a eutectic with
carbon. I have never found anyone who can explain this, even above 3,000 C it will not form a carbide. The very reason why so many years ago I chose
IrC, one must always have a never ending goal.
"Science is the belief in the ignorance of the experts" Richard Feynman
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DFliyerz
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| Quote: Originally posted by IrC | Since your on the subject can anyone explain why my name is unobtanium. I tried for years but Iridium will not form a carbide, only a eutectic with
carbon. I have never found anyone who can explain this, even above 3,000 C it will not form a carbide. The very reason why so many years ago I chose
IrC, one must always have a never ending goal.
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I'm guessing you've tried extremely high pressure as well?
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IrC
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No I'm not that well equipped but so far all the papers I have read by scientists that are say the same thing, only a eutectic is possible. Or at
least this is all that has been accomplished in the area of Iridium - Carbon chemistry. Electronics is my real job I am not a chemist although I have
studied and experimented for many years in that and other disciplines. My theory knowledge of chemistry is not on the level of so many here. But I do
not see why Iridium does not bond with carbon in the same way say W does. There must be a reason yet so far I have never found a paper which explains
it in detail. Likely only because it is not something many have been motivated to investigate.
Mostly Pt and Pd are discussed in the following PDF's although Ir reacts in similar ways.
Attachment: pmr-v8-i3-101-101.pdf (89kB)
This file has been downloaded 466 times
Attachment: Tempmeko 2001 HTFP at NPL Vol 1 Page 519.pdf (3MB)
This file has been downloaded 556 times
[Edited on 2-15-2015 by IrC]
"Science is the belief in the ignorance of the experts" Richard Feynman
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DFliyerz
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| Quote: Originally posted by IrC | No I'm not that well equipped but so far all the papers I have read by scientists that are say the same thing, only a eutectic is possible. Or at
least this is all that has been accomplished in the area of Iridium - Carbon chemistry. Electronics is my real job I am not a chemist although I have
studied and experimented for many years in that and other disciplines. My theory knowledge of chemistry is not on the level of so many here. But I do
not see why Iridium does not bond with carbon in the same way say W does. There must be a reason yet so far I have never found a paper which explains
it in detail. Likely only because it is not something many have been motivated to investigate.
Mostly Pt and Pd are discussed in the following PDF's although Ir reacts in similar ways.
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I didn't look much into it, but there were some mentions of research involving the optical properties or something of iridium carbide. I also saw
something about it being for sale.
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Bot0nist
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Not sure if it's legit, but there are a few listings for your unobtainium on google. I thought I had read somewhere that it was employed in hydrazine
propulsion systems. I can't recall where now though.
http://www.americanelements.com/irc.html
U.T.F.S.E. and learn the joys of autodidacticism!
Don't judge each day only by the harvest you reap, but also by the seeds you sow.
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IrC
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Odd they list no properties for their IrC other than being crystalline. From all I have studied thus far my guess is their weight of 204.228 is merely
the sum of Ir and C, and it is a mixture not a compound (chemical molecule). I would not call IrC a compound as one would say Tungsten Carbide, but
merely a crystalline structure of a mechanical mix between Ir and C. This seems to be the trend with all the Platinum group elements.
From the PDF I linked above (pmr-v8-i3-101-101.pdf):
"X-ray diffraction studies showed that these eutectiferous structures were mechanical mixtures of the metals and graphite.
The lattice parameter data indicated that the solid solubility of carbon in platinum, palladium, rhodium and ruthenium was vanishingly small, and
prolonged heat treatment at temperatures just below the eutectic points failed to induce any of these metals to take up any carbon."
"Science is the belief in the ignorance of the experts" Richard Feynman
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