[labnetwork] Ni evaporation

[Nathan Nelson - Fitzpatrick]

Hi Julia,

I don’t recall what we paid for the Al2O3 crucibles.  I do recall that the Tungsten crucible was about 3-4x more expensive than the comparably sized VC crucible.

Best,
  -Nathan
--
Nathan Nelson-Fitzpatrick  PhD
Nanofabrication Process Engineer
Quantum NanoFab
University of Waterloo
200 University Avenue West
Waterloo, ON   Canada  N2L 3G1
Ph: +1 519-888-4567 ext. 31796

From: "julia.aebersold at louisville.edu<mailto:julia.aebersold at louisville.edu>" <julia.aebersold at louisville.edu<mailto:julia.aebersold at louisville.edu>>
Date: Monday, March 23, 2015 at 1:52 PM
To: Nathan Nelson - Fitzpatrick <nnelsonfitzpatrick at uwaterloo.ca<mailto:nnelsonfitzpatrick at uwaterloo.ca>>, Nava Ariel- Sternberg <anava at tauex.tau.ac.il<mailto:anava at tauex.tau.ac.il>>, "labnetwork at mtl.mit.edu<mailto:labnetwork at mtl.mit.edu>" <labnetwork at mtl.mit.edu<mailto:labnetwork at mtl.mit.edu>>
Subject: RE: [labnetwork] Ni evaporation

I really like this idea for we have cracking crucibles all the time.  Running without a crucible scares me if the beam were to melt the hearth and puncture the water jacket.  Nathan, what was your price difference between Tungsten and Al2O3 crucibles.

Cheers!

Julia Aebersold, Ph.D.
Cleanroom Manager
Micro/Nano Technology Center
University of Louisville
Shumaker Research Building, Room 233
2210 South Brook Street
Louisville, KY  40292

502-852-1572
http://louisville.edu/micronano/

From: labnetwork-bounces at mtl.mit.edu<mailto:labnetwork-bounces at mtl.mit.edu> [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Nathan Nelson - Fitzpatrick
Sent: Monday, March 23, 2015 9:19 AM
To: Nava Ariel- Sternberg; labnetwork at mtl.mit.edu<mailto:labnetwork at mtl.mit.edu>
Subject: Re: [labnetwork] Ni evaporation

Hi Nava,

We have also experienced problems in our lab with Ni e-beam evaporation in VC or Al2O3 crucibles.  We found that the VC crucibles would break down after a few deposition cycles (and would “tarnish” the Ni melt) and the one time we tried Al2O3 as a crucible liner it broke immediately upon removal from our E-beam hearth.  We have settled on using Tungsten crucibles for our Ni e-beam evaporation.  We have not observed any notable problems with this process and our first W crucible lasted for over two years before we needed to retire it.

Best regards,
  -Nathan
--
Nathan Nelson-Fitzpatrick  PhD
Nanofabrication Process Engineer
Quantum NanoFab
University of Waterloo
200 University Avenue West
Waterloo, ON   Canada  N2L 3G1
Ph: +1 519-888-4567 ext. 31796





From: Nava Ariel- Sternberg <anava at tauex.tau.ac.il<mailto:anava at tauex.tau.ac.il>>
Date: Monday, March 23, 2015 at 5:30 AM
To: "labnetwork at mtl.mit.edu<mailto:labnetwork at mtl.mit.edu>" <labnetwork at mtl.mit.edu<mailto:labnetwork at mtl.mit.edu>>
Subject: [labnetwork] Ni evaporation

Hi all,

We've came across some issues with Ni e-beam evaporation and thought of consulting the network:

Which crucible are you using for Ni e-beam evaporation? We've tried Al2O3 and Vitreous carbon, both recommended by the material/crucible suppliers.
Any tips with respect to melting the material or the evaporation process itself?

Thanks,

Nava


Nava Ariel-Sternberg, Ph.D.
Tel-Aviv University Center for Nanoscience and Nanotechnology, Managing Director
MNCF Manager
Phone: 03-640-5619
Mobile: 054-9984959
Email: anava at tauex.tau.ac.il<mailto:anava at tauex.tau.ac.il>

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