I have synthesized nickel ferrite nanoparticles at 500 C, 700 C and 900 C. For 500 C size is 260nm, for 700 C size is 75.98 nm and for 900 nm particle size is 100 nm. So why particle size decreases with an annealing temperature.
Ömer Anakök
How are you measuring/estimating 'particle size'? Your last statement ('So why particle size decreases with an annealing temperature') is not strictly true as the size rises again at 9000C.
BTW, you can correct your typo in '900 nm particle size is 100 nm'...
The number of decimal places varies in 'For 500 C size is 260nm, for 700 C size is 75.98 nm and for 900 nm particle size is 100 nm'. For what reason?
Also, please answer what the diameter of a hydrogen atom is (and thus why you 'can' quote 75.98 nm)...
Why 3 question marks? (???).
In this case, the change of the primary particle average size as a function of temperatures showing two decoupled zones, particles shrinkage by densification up to a certain temperature between the range 700oC - 900oC and growth by coarsening behaviour at higher this temperature. Please look at figure 4 and its related explanations in [1]. Hope it helpful for you.
Best regards
[1]Article Investigating the effects of calcination temperatures on the...
We have been making some ferrites NPS. Although we haven't determined their size before and after annealing, since their magnetic properties increased after annealing we think their size also increased.
The reaction temperature has main effect on the crystal growth and particle size. Also,the data in our experimental work in the synthesis of nanomaterials showed that the lattice parameters were increased with increasing the reaction temperature.
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