the nickel sulfide thin films were prepared by spray pyrolysis technique on a
glass substrate at various deposition temperatures of 523, 573 and 623 K. The structural, at 523, 573 and 623 K having an
orthorhombic, hexagonal and hexagonal structure, which were Ni3S2, Ni17S18 and NiS2, with particles size 49.8nm, 45.9nm and 84.6nm
The question is : what is the reason for this variance size?
Layla Haythoor Kharboot
Why would you expect the results to be similar? Have you carried out an error budget on your results?
49.8 +/- ? (Estimate or calculate 3 standard deviations).
One further question - do you know what the diameter of an H atom is?
Look at Herring’s Law for aggregation/agglomeration in relation to temperature.
Dear Alan, thanks to answer
It is not my results, I am new in this field and I just ask about the reason for the different size, and as you see at 573K, the size was smaller than at 623K,
additional ,what is the limited of T to make small size
Layla Haythoor Kharboot
There are things to think about in broad terms.
Consider the heterogeneity of the system in relation to the sample mass used for the experiment (hence +/- and consideration of decimal places). The crystallite size is a single number when we know there must be a distribution and thus there is variation within the sample. Can you estimate this?
The diameter of the H atom (a question for you that you didn’t answer) has decimal place implications.
As the T increases then the extent of aggregation and agglomeration increases and the size increases. Hence the reference to Herring’s Law. All of these are things to explore in your research.
Layla Haythoor Kharboot
Here's Herring's Law. A little search on RG brings this up.
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