For a tetragonal crystal structure of orientations (110) and (200), i successfully found lattice parameter, a = 0.4597 nm. Now, the question is how to find the lattice parameter, "c" ? For tetragonal, a=b.
It's little more complicated as for the cubic system, but you know your parameters:
a=b=/=c and all angles are 90°
now, for simple cubic system you would calculate d(hkl) = a / (sqrt(h^2+k^2+l^2)) but in tetragonal system c-axis is "independent" of others, so you can calucalte it from the ratios as: 1/d^2 = a^*2 (h^2 + k^2) + c^*2 l^2 or simplified as 1/d^2 = (h^2 + k^2) / a^2 + l^2 / c^2.
@Janez...yeah that is true.But, i have the crystal orientations that are (110) and (200) for which l = 0, hence how to determine c ?
That's what I'm saying... you can caluculate it from a reflections where l=/=0...
Do you have XRD or TEM data? May be worth looking also for more appropriate reflections...
Thanks but id didnt get it. If l = 0, then how can we calculate c ? I dont have TEM as this is thin film data.
It depends how you measured X-ray data to obtain a and b axis lengths. Was it powder diffraction, single counter difractometer, precession camera or rotation camera. These different methods will have c measured in different ways.
Dear Sudhanshu Dwivedi,
What kind of your sample, perhaps you can match it with PCPDF-WIN database. If you tell us the sample, I can send you the database. Hopefully it can help.
Cheers,
Indra
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