[labnetwork] Lantanum evaporation

[Ted Wangensteen]

Again, I have no experience with the chemistry, and perhaps usual places do
not carry SiC.

However, I found this vendor - Perhaps something close to your size, or
they can custom make something for your tool.

https://www.lmine.com/silicon-carbide-sic-crucibles-c-1_2_98/#:~:text=Silicon%20Carbide%20(SiC)%20Crucibles%20are,base%20metals%2C%20and%20other%20products
.

Hope this might be helpful.
BR,
Ted

On Fri, Aug 19, 2022 at 8:59 AM Michael Yakimov <yakimom at sunypoly.edu>
wrote:

> 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>
> 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> On Behalf Of dbouillez
> plasmaprocessgroup.com
> Sent: Wednesday, August 17, 2022 17:26
> To: Alexey Kovalev <kovalev at magnet.fsu.edu>; 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
> 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> On Behalf Of Alexey
> Kovalev
> Sent: Wednesday, August 17, 2022 9:34 AM
> To: 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
>
> --
> Alexey Kovalev
> Assistant in Research
> A302
> NHMFL FSU
> 1800 E. Paul Dirac Dr.
> Tallahassee , FL 32310-3706
> kovalev at magnet.fsu.edu
> TEL:850-644-0861
> FAX:850-644-5038
>
> 5161 706C 6127
>
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