
#1
Aug913, 01:48 PM

P: 10

Hello,
Quick rundown: I am attempting to model thin film materials (e.g. TiAlN) for thermal analysis. I amconfused on how to figure out the number density of Nitrogen for a ceramic. Allthe tables I have in school textbooks are for gas (~0.0013 g/cm3). I can finddensity of nitrogen/oxygen in a solid state, but is this the correct density? Question: Is the density of the solid state the correct density to use for modelling ceramics? I realizethe structural differences, but not certain if the density can be estimated to bethe same. Any assistance will be much appreciated! 



#2
Aug913, 02:58 PM

Thanks
P: 1,312

The cutting edge of technology.
If you know the structure, maybe you can calculate the density from the ionic radii. Calculate also for another similar material with a known density to check the method. See the table here; http://en.wikipedia.org/wiki/Ionic_radius 



#3
Sep213, 02:41 AM

P: 43

It's pretty easy if you know the structure. If you don't then some sort of mass spec is your only hope on a real sample.
You basically need to find a repeating unit of structure then calculate the weight / volume of that repeating unit. On planar surfaces sometimes planar density is calculated as weight / area instead like graphene as it's thickness is pretty much nonexistent. If you have the chemical formula (which may not be consistent for a thin film if it is doped) you assume you have a repeating unit of the chemical formula calculate the percent mass of Nitrogen and multiply that by total mass/total volume. Similar to above, but easier. Otherwise you do a mass spec of the results figure % mass nitrogen and divide by volume. 


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