Ceramic Properties vs. Solid Properties

by shakystew
Tags: ceramics, material propteries
shakystew is offline
Aug9-13, 01:48 PM
P: 10

Quick run-down: I am attempting to model thin film materials (e.g. Ti-Al-N) 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!
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Baluncore is offline
Aug9-13, 02:58 PM
P: 1,312
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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
ChaseRLewis is offline
Sep2-13, 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 non-existent.

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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