What factors (in addition to temperature) contribute to the migration of platinum in Pt thin films at high temperatures? What methods are there to prevent or inhibit this from happening?
Please specify what kind of migration you mean? Which gradient fields your film is exposed to (e.g. is the temperature constant)? What is the substrate?
The Pt draws together and forms voids and bridges then isolated islands of Pt., all of which appears to be a surface tension effect. There is an electric field of between 5 and 16 volts across the Pt with current
OK, I may here also possible electrocapillary effect and also electromigration. Assuming thickness of 100 nm, width 10 mm and length 20 mm (no idea if it is your case), you would have a electric field gradient of 16/0.02 = 800 V/m with current density 0.25/(1e-7*1e-3) = 2.5 millions A/m2. This would give 2 gigawatt/m3 electric energy which seems to be very high.
Of course, you need to eneter your realistic sample size, but similar effect I have seen for solders (at microballs current densities may reach gigaA/m2 and there is a stroign effect on vacancy wind). Sorry, just do not rememeber where I saw this reference, several years ago.
Could you check whether the same effect occurs if there is no voltage, just by heating?
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