Not quite sure how to express this question, but can anyone tell me how much larger a 1 micron feature on a pure nickel substrate at 20C will be when the substate temp is raised to 55C?
Can this be expressed as a percentage - that is, expect features to change by X% when substrate is raised in temp from 20 to 55C?
According to www.matweb.com, the linear thermal expansion coefficient of pure nickel is 13.1 µm/m-°C. With a delta T of 35C, that gives 458.5 µm/m, or .0459%. The 1 micron feature would expand to 1.0459 microns.
Wikipedia says linear thermal expansion coefficient of nickel is 13 x 10[sup]-6[/sup] /K at 20[sup]o[/sup]C. That means raising the temperature by 35K will expand it by 35 x (13x10[sup]-6[/sup])=4.6x10[sup]-4[/sup]=0.046%.
I think you mean 1.000459 microns.
Wow, that’s great - thanks!
That’s my problem, I found the CTE of pure nickel on the web, but I had no idea how to use the value.
No, I meant 1.000459 microns. 
You are asking about a tiny feature, only a micrometer. Everything scales linearly so if you weren’t going to worry about whether a 3" bolt at room temperature is still a 3" bolt sitting on a hot car dashboard, you also can neglect whether the feature has changed size. Its being small doesn’t make it more sensitive to thermal expansion.
Of course I am trying to guess why you are asking.
What are you doing, anyway? Calibrating an SEM or something?