[labnetwork] Lantanum evaporation

[Michael Yakimov]

Are there commercially available SiC crucibles for e-beam? Never heard of those, and nothing at my usual suspects (Kamis, Lesker, Thermionics) nor on the first page of Google.
And there is certainly carbide formation in Al+SiC system at temperatures used for evaporation.
Iseki, T., Kameda, T. & Maruyama, T. Interfacial reactions between SiC and aluminium during joining. J Mater Sci 19, 1692–1698 (1984). https://doi.org/10.1007/BF00563067


________________________________
From: Ted Wangensteen <twangens at mail.usf.edu>
Sent: Friday, August 19, 2022 9:09:28 AM
To: Michael Yakimov <yakimom at sunypoly.edu>
Cc: Alexey Kovalev <kovalev at magnet.fsu.edu>; labnetwork at mtl.mit.edu <labnetwork at mtl.mit.edu>
Subject: Re: [labnetwork] Lantanum evaporation

If C is a concern, you may consider SiC.
I have no experience with that, but you could research that type.
BR,
Ted Wangensteen

On Thu, Aug 18, 2022 at 7:19 PM Michael Yakimov <yakimom at sunypoly.edu<mailto:yakimom at sunypoly.edu>> wrote:
From the general perspective...

La is an active metal, it slowly oxidizes in the air. It is very feasible that it may react with carbon and form carbide, if melted in carbon crucible. So the way I read that crucible selection is "do not use carbon! Use something else". Yellow layer of Aluminum Carboide can become a problem with carbon crucible as well, so at least this is a feasible assumption.
As an active metal, again, it will wet most other crucibles - I don't think that can be avoided. Density of Liquid La is somewhat  below solid, but not too much - so I suspect it may be breaking crucibles like Al, so beware of ceramic ones. Otherwise, I would be looking at crucible price - those materials must be steep.

If you have to justify the use of metal in evaporator, compare La with Al. It seem to be on the same page from e-beam deposition perspective.

Thanks

mike






-----Original Message-----
From: labnetwork <labnetwork-bounces at mtl.mit.edu<mailto:labnetwork-bounces at mtl.mit.edu>> On Behalf Of dbouillez plasmaprocessgroup.com<http://plasmaprocessgroup.com>
Sent: Wednesday, August 17, 2022 17:26
To: Alexey Kovalev <kovalev at magnet.fsu.edu<mailto:kovalev at magnet.fsu.edu>>; labnetwork at mtl.mit.edu<mailto:labnetwork at mtl.mit.edu>
Subject: Re: [labnetwork] Lantanum evaporation

Hello Alexey,

I have several questions if you don't mind me asking:

What gas environment do you intend to use for evaporation?
What is the end product you are looking to produce with the use of this material?
Are you looking for liners that allow for best adhesion of over spray? Or, looking at concerns with contamination from secondary deposition?

I can't say that I have a background on this material, but I would be interested in knowing the use for this material if it can be disclosed.

Thanks,

Dan

Dan Bouillez
Plasma Process Group
Sales
dbouillez at plasmaprocessgroup.com<mailto:dbouillez at plasmaprocessgroup.com>
PH  970-663-6988
Cell 970-415-7259
PPG business hours Mon-Thurs 7 am to 5:30pm Mountain time

-----Original Message-----
From: labnetwork <labnetwork-bounces at mtl.mit.edu<mailto:labnetwork-bounces at mtl.mit.edu>> On Behalf Of Alexey Kovalev
Sent: Wednesday, August 17, 2022 9:34 AM
To: labnetwork at mtl.mit.edu<mailto:labnetwork at mtl.mit.edu>
Subject: [labnetwork] Lantanum evaporation

Hello All,
We are thinking about e-beam evaporation of Lanthanum.Kurt Lesker recommends either tungsten or tantalum liner and I am wondering what could be the difference in this case. I also found out that Thermionics thinks that alumina liner will work as well.
Could anybody please  give a comment, either on evaporation of the lantanum, or on the liner material?
Thank you very much
Alexey

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Alexey Kovalev
Assistant in Research
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NHMFL FSU
1800 E. Paul Dirac Dr.
Tallahassee , FL 32310-3706
kovalev at magnet.fsu.edu<mailto:kovalev at magnet.fsu.edu>
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