Re: [sdpd] XRD intensity

[Luca Lutterotti <Luca.Lutterotti...@ing.unitn.it>]

Thomas,
as Armel pointed out in this case you have a combination of both too 
thin film and low crystallinity.
The film can be completely crystalline, but the maximum domain size 
cannot be bigger than the film thickness in the normal to film 
direction.
So actually with 30 nm you are at the limit of the lab technique and a 
domain size <= 30 nm will broad quite a lot the film, plus the 
broadening for the grazing angle condition (not bragg-Brentano) and you 
hardly will see something unless you have a position sensitive detector 
like the CPS 120 Daniel Chateigner is suggesting.
See our paper on Thin Solid Film: L. Lutterotti, Chateigner et al., 
Thin Solid Film, 450 (2004) 34-41.
In fig. 6-7-8 we reported the analysis of a 17.5 nm (measured by 
reflectivity) zirconia film we successfully measured also in 
diffraction to quantify polymorphs and domain sizes/microstrains. This 
was possible using a CPS 120 detector but counting a lot as the peaks 
were very broads and intensity quite low (the total measurement I 
vaguely remember was in the day/half day order with the CPS 120, but we 
measured also the texture). We were really on the limits and similar 
should be your 30 nm film. You need a machine specially equipped for 
such analysis or prepare for a quite long measurement.

Best regards,
		Luca Lutterotti

On Mar 11, 2005, at 4:21, Hysen Thomas wrote:

>
>
> Dear all
> I am hysen from cochin university ,Kerala. I am working on
> nanomagnetic materials. specifically an alloy of irom molybdenum boron
> and nickel. I have prepared thin films of this having thickness around
> 30 nm by resistive heating and annealed the sample upto the
> crystallization temperature of the bulk. But interestingly the xrd
> spectrum shows peaks which are very feeble which has intensity
> comparable to that of the noise. Can anybody has any suggestionsto
> improve the xrd spectrum. Due to this low intensity i cant do any 
> fitting.
> Thank you in advance
> Hysen Thomas researcher
> Cusat
> Cochin 22
> Kerala
>
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>
> Yahoo! Groups Links
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