Named the composition of the ferrite is not straightforward. Your composition, (micro)structure (or texture), the distribution in sublattices can be different from the reference.

@  Alexander T. Morchenko

Dear Dr. Morchenko,

Thanks for your helpful response. Would you please tell me why named the composition of the ferrite is not straightforward??

Dear Farnaz

There is not problem if one peak intensity greater than another,the sharpest peak is in 43 degree this mean the preferred orientation (miller indices) for your compound at this angle, and this because the compositions of compound and Dr. Alexander noted that. Also, you synthesized NiCoFe2O4 compound successfully, but how can you prove synthesized NiCoFe2O4 nanoparticles successfully. I think that need some observations and calculations about figure of xrd, and this not enough but you need TEM, SEM, and UV-Visible tests.

With my best wishis

Dear Dr. Taher,

thank you so much for your suitable answer.

The intensity of xrd peaks do have the correlations with the particular compound formation but it is not only the tool to say what you say 'to claim'!. However, sometimes due to the shape or texture of particles, the peak intensity differs. Well it is simple to understand, you imagine a spherical particle, and xrd incident on it diffracts with some amount, which differs  for different textures, although both are same .Other studies will help your claim and XRD alone cannot 

Could you attach the XRD spectrum of your sample please? 

@  Kadhim A. M. Khalaf

Dear Dr. Khalaf, thanks for your time and attention. yes I attached it in below.

@  Sridharan Ravi

Dear Dr. Ravi thank you so much for your helpful response.

I am worried that there is no well resolved peaks on your XRD spectrum for  your claim and contains noise signals. Repeat your XRD measurements

@  Sridharan Ravi

The size of particels is below 10 nm. so can they make lots of noise signals in XRD result??

Well if you could not show your resolved peaks, then it would be difficult to interpret the composition using XRD. Whatever be the size. Other way of doing is using low angle diffraction. Even people are getting resolved spectrum for DNA which sizes around 5 nm. In your case, I feel it is rather difficult to interpret.However, try claiming your nanoparticles using some other studies. 

Dear Farnaz

What is thickness value for your sample?

I think your problem may because low thickness for your sample which tend to reduce the intensity for your samples. 

Dear Dr. Taher,

Thanks for your consideration. I have spherical particles with size around 4-5 nm. Can it make this problem for XRD result??

Dear Farnaz

I mean in my question the thickness for your sample (NiCoFe2O4 nanoferrite) which was characterization in xrd test for example (100, 140, 300, ..nm) or may be 1000 nm.

  Spherical particles with size around 4-5 nm, this mean donot get on the sharp peaks in xrd figure but will get on the wide peaks as were shown in your figure because the spherical particles is very small and this behaviour mean you get on (nano), but the noise in general in the figure may be as low thickness for sample (not grain size).

@ Bilal Taher

Dear Dr. Taher,

Many thanks for your suitable answers.

Sorry I got wrong your question. I do not know about the thickness of my sample in XRD test but I guess maybe it was around 50 Micron, according to what I saw.

This mean this thickness not caused the low intensity for peak.   

Dear Farnaz dont worry, but you need use another technique to prove synthesized NiCoFe2O4 nanoparticles successfully, as TEM technique.

Good luck  

@ Bilal Taher

Dear Dr Taher,

I Greatly appreciate you for your time and attention.

Best regards

"Would you please tell me why named the composition of the ferrite is not straightforward??" (Farnaz Ebrahimi)

I mean that the composition is given in General form. And depending on the specific relation between Co and Ni, technology and mode of producing it may be different crystallochemical composition and cation distribution on the sublattices.

ATM

@ Alexander T. Morchenko

Dear Dr. Morchenko,

Many thanks for your helpful response.

With Best regards

Dear Farnaz,

I think that TEM technique can help you

@ Elie Assaf

Dear Dr. Assaf,

Thanks for your help.

What method have you used for synthesixing this ferrite?

@ Mohammad Kooti

Dear Dr. Kooti

I use microemulsion method to synthesize this ferrite.

Using XRD readings, calculate lattice parameters and compare them with the similar parameters of the same compound to prove

Dear Farnaz

The only thing I can guess is that you might have some impurity in your synthesized NiFe2O4.One of these impure phases can be iron(III) oxide.I have checked the XRD patterns of these oxides and noticed that gama-Fe2O3 has a sharp peak around 2-Theta 43 and this peak can be the cause for the sharp peak you observed in the nickel ferrite pattern.Please check other peaks of this iron oxide to see if you have some of them in the pattern of NiFe2O4.

@ M Z Ahsan

Dear Dr. Ahsan many thanks for your helpful response. 

@ Mohammad Kooti

Dear Dr. Kooti,

I really appreciate to put your time for helping me.

with best regards

Dear,

If you have used FeKalpha radiation instead of CuKalpha radiation than sharp 311 peak may be at 43 degree instead of 35 degree very simple.

@ Kunal Modi

Dear Dr. Modi,

many thanks for your helpful response.

it is really reasonable answer.

with best regards,

Farnaz

I hope it was of some help for your research.good luck.

Hi

It is well known that the impurities have some effects on the peak intensity. In this regards I think that Dr. Modi's and Dr. Kooti's notes are worth considering in the X-ray diffraction analysis and in these samples in particular.

Best Luck