[labnetwork] Aluminimum source crucible suggestions

[Steffen, Paul]

Cliff,

We had problems with cracking liners and also aluminum wicking up intermetallic BN-TiB2 liners and bridging to the edge of the hearth pocket causing drops in the deposition rate due to heat conduction. We found out about an alternate approach used on an older CHA ebeam evaporator on campus with the same pocket size (15 cc): they dispensed with the liner and just made an aluminum melt directly in the pocket. The edges that touch the pocket are oxidized so you can still remove the melt slug. If you maintain the melt slug to the top of the pocket, then you don't have to worry about deposition on the sides of the pocket either. Please contact me if you would like more information.

-Paul

[The Ohio State University]
Paul Steffen
Lab Manager
Institute for Materials Research Nanotech West Lab
100 Science Village, 1381 Kinnear Road, Columbus, OH 43212
614-688-3546 Office / 614-688-3379 Fax
steffen.8 at osu.edu<mailto:steffen.8 at osu.edu> nanotech.osu.edu<http://nanotech.osu.edu>



From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Clifford F Knollenberg
Sent: Tuesday, May 31, 2016 1:12 PM
To: labnetwork at mtl.mit.edu
Subject: [labnetwork] Aluminimum source crucible suggestions


Hi All,



We've been having crucible cracking issues with out Al e-beam evaporation source.  In short it cracks its crucible after just a few uses.  This wasn't so bad when it happened ever 4-5 months, but not its happening about every week or two.  I've tried a variety of crucibles, had the most luck with carbon crucible.  Is there anything else out there we should be trying?



Cheers,



Cliff



Clifford Knollenberg

Science & Engineering Associate

Stanford Nano Shared Facilities (SNSF)

Email: cknollen at stanford.edu<mailto:cknollen at stanford.edu>

Tel: 650-723-1675
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mtl.mit.edu/pipermail/labnetwork/attachments/20160531/b247e86d/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 3605 bytes
Desc: image001.png
URL: <https://mtl.mit.edu/pipermail/labnetwork/attachments/20160531/b247e86d/attachment.png>