[labnetwork] Lantanum evaporation
Gila,Brent P
bgila at ufl.edu
Fri Aug 19 13:00:11 EDT 2022
We have had great success with Sage.
https://www.sage4sales.com/products/crucible-liners They are very
helpful/knowledgeable and they also supply crucible shims so you can get
more heat out of your system at lower e-gun powers. A plus for some
materials.
Best Regards,
Brent
On 8/19/2022 11:31 AM, Ted Wangensteen wrote:
> *[External Email]*
>
> OK, guess the product doesn't exist yet.
>
> Perhaps Lesker or other will up their game.
>
> BR,
> Ted
>
> On Fri, Aug 19, 2022 at 9:26 AM Michael Yakimov <yakimom at sunypoly.edu>
> wrote:
>
> You may confuse the topic a bit. Those are general purpose
> crucibles. Once e-beam evaporation is mentioned, it is a pretty
> specific – and different - product type. While “crucible” is a
> common term used for those, “hearth liners” is a more precise one
> if confusion has to be avoided. Frankly speaking, even original
> question from Alexey used the term “liner”; my fault in switching
> to lab slang.
>
> For example:
> https://thermionics.com/product-category/e-guns/crucible-liners/
> <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fthermionics.com%2Fproduct-category%2Fe-guns%2Fcrucible-liners%2F&data=05%7C01%7Cbgila%40ufl.edu%7Cf80c0ca273394536368b08da81ffe09f%7C0d4da0f84a314d76ace60a62331e1b84%7C0%7C0%7C637965233236537261%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=UBG8spFFhWtMeGJMkAnmJnKGiy1tBZwgfMLi2Q9j3DA%3D&reserved=0>
>
> And those have to be machined to a pretty precise dimension and
> surface finish, unlike regular furnace crucibles..
>
> *From:* Ted Wangensteen <twangens at mail.usf.edu>
> *Sent:* Friday, August 19, 2022 10:06
> *To:* Michael Yakimov <yakimom at sunypoly.edu>
> *Cc:* Alexey Kovalev <kovalev at magnet.fsu.edu>; labnetwork at mtl.mit.edu
> *Subject:* Re: [labnetwork] Lantanum evaporation
>
> 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
> <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.lmine.com%2Fsilicon-carbide-sic-crucibles-c-1_2_98%2F%23%3A~%3Atext%3DSilicon%2520Carbide%2520(SiC)%2520Crucibles%2520are%2Cbase%2520metals%252C%2520and%2520other%2520products&data=05%7C01%7Cbgila%40ufl.edu%7Cf80c0ca273394536368b08da81ffe09f%7C0d4da0f84a314d76ace60a62331e1b84%7C0%7C0%7C637965233236537261%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=RV8Dcd6ccVjxs3WqqkWpFqz0X%2B%2FumTT6qfvkxkiEqVo%3D&reserved=0>.
>
> 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
> <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10.1007%2FBF00563067&data=05%7C01%7Cbgila%40ufl.edu%7Cf80c0ca273394536368b08da81ffe09f%7C0d4da0f84a314d76ace60a62331e1b84%7C0%7C0%7C637965233236537261%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=wUm%2FPOS9e2hyOEChobfHDMueXmvrMWRA8eW9Sm7Nkcw%3D&reserved=0>
>
> ------------------------------------------------------------------------
>
> *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
> <https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fplasmaprocessgroup.com%2F&data=05%7C01%7Cbgila%40ufl.edu%7Cf80c0ca273394536368b08da81ffe09f%7C0d4da0f84a314d76ace60a62331e1b84%7C0%7C0%7C637965233236537261%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=EiuPpTbxUsfASmIb19EDOWPB8LOiMI9%2FfrD7blqQLcA%3D&reserved=0>
> 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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