Dear Respected RG Experts
What are the important factors/parameters on which crystallite size of co-precipitated compound depends?
For example, a series of inorganic compound (oxides) prepared by same method under same experimental conditions with slight change in composition (such as doping) results in different crystallite sizes. So, is there any general rule/reasons or it is specific to particular reaction condition? What are the parameters on which it depends? How these phenomena are usually understood/ explained?
Please provide relevant literatures/books/other resources.
Your kind views and suggestions are most welcome.
With best regards
Doping does not change the composition.
There is no a general rule for a number of different compounds because you might need different precursors/solvents. However, the temperature is the most important parameter affecting the grain size.
The temperature, reaction time and precursors type and concentrations are the most important parameters affecting the crystallite size. Also organic modifiers as polymers and organic acids change the crystallite size, which was presented in my work. Article Structure and optical properties of Fe 3 O 4 nanoparticles s...
Well , try using the following tricks to reduce the crystallite size.
1.PH: Adjust the PH means fast forcing the nucleation.Add the OH precursor as fast as possible.
2.Limit the oxygen supply in the reaction .Cover it to avoid atmospheric parameters from intervening.
3.Use high temperatures for reaction to take place.
4. Use good quality precursors , Sigma Aldrich or Merk etc
5.Proper washing before calcination.USe good quality Deionized water for that.
I used these tricks to get my crystallite size to as low as 4nm.
Thank you so much dear Dr Daniela for kind suggestion. In my statement, cpmposition change refers to changing the concentration of dopant say, A(1-x)DxB2O4, where x= 0.1,0.2,0.3 etc D represents dopant. Here all the experimental conditions remain same except this vriation in x.
With best regards
Thank you so much dear Dr Adrian for the kind suggestion and sharing your work. I agree with your answer but as mentioned above, i am varying only the dopant concentration.
With best regards
Thank you so much dear Dr Muhammad for the kind suggestions and sharing personal experiences. Usually i use starting materials from merk and proper washing of ppt is always done with double distil water. But, i am not very familier with the steps 1,2,3 in your tips, so i would like to request you to please add some explanation/ importance of it. I can see a good control of size in your synthesis method. Thanks a lot for the tips.
With best regards
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