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Nickel expands on crystallizing, like Al - so if it wets crucible walls, crucible will crack.</div>
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Slow cooldown, effectively re-melting and re-crystalizing layers at crucuble sidewalls helps a bit, but that's about it.</div>
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The good news is that you can still run from the center of cracked crucible if it doesn't expand way out. Ni evaporates not too far above melting point - so walls can stay below melting point and metal is still contained. Some carbon contamination... I didn't
look at it myself, but pretty likely anyway.</div>
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Just my2 cents</div>
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Mike</div>
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<p style="margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="color: black;">Michael Yakimov</span></p>
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<p style="margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="color: black;">Department of Nanoscale Science and Engineering</span></p>
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<p style="margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="color: black;">253 Fuller rd.</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> on behalf of Shawn Wagoner <swagone@gmu.edu><br>
<b>Sent:</b> Wednesday, December 4, 2024 9:01 AM<br>
<b>To:</b> shokoofe haghighi <shokoofe_haghighi@yahoo.com>; labnetwork@mtl.mit.edu <labnetwork@mtl.mit.edu><br>
<b>Subject:</b> Re: [labnetwork] question about Liner for Ni Ebeam Evaporation</font>
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<p class="x_MsoNormal">For e-beam of Ni you should try a “starter source”. At least that is the term I learned long ago. It is a solid piece of Ni in the shape of the pocket of your gun. No additional liner is used. As you evaporate the Ni and create a
small hole in the top of the source you simply add Ni pellets. It last a long time this way. Most of the suppliers should be able to supply this to you. I used to buy them from Kamis.</p>
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<p class="x_MsoNormal">Shawn</p>
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<p class="x_MsoNormal"><b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> <b>
On Behalf Of </b>shokoofe haghighi<br>
<b>Sent:</b> Wednesday, December 4, 2024 4:35 AM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] question about Liner for Ni Ebeam Evaporation</p>
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<p class="x_MsoNormal" style=""><b><span style="color:black">External Message:</span></b><span style="color:black"> Use Caution
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif">Hi, hope you are having good days, </span></p>
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif">this is Haghighi, working on metallization by a PVD, using thermal and Ebeam evaporation. </span></p>
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif">I have some issues choosing the right liner for Ni Ebeam evaporating, hope you find time to guide me through it. </span></p>
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif">We have tested graphite, glassy carbon coated graphite, Al2O3, Mo, W and Cu liners so far. </span></p>
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif"> Graphite liner just broke after first run from the border line of Ni surface. <span style="color:black">Glassy carbon coated graphite was more or less the same,</span></span></p>
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif"> Al2O3 endured for 4-5 runs before breaking but there were cracks on it, </span></p>
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif"> Mo liner totally melted and some kind of alloy was produced,</span></p>
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif"> W and Cu endured but their internal walls were some how melted and we can't be sure about pureness of evaporated Ni and final produced thin films.</span></p>
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif">do you have any other suggestions? </span></p>
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif">high voltage: 6.1 KV</span></p>
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif">emission current: 3 - 5 A</span></p>
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif">Thanks for your time and attention in advance, I hope you kindly find time and consider replying me, </span></p>
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<p class="x_MsoNormal"><span style="font-size:10.0pt; font-family:"Helvetica",sans-serif">Dr. Haghighi</span></p>
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