Dear Schmitt EDX is not the exact method for determination of exact composition

A possibility is to use ICP (inductively coupled plasma), an analytical technique

Ms Bini Very interesting to know about ICP as analytical technique. Any paper you suggest madam.

At the moment I do not have papers to suggest but I can ask to my collegues of the analytical department that usually perform this kind of measurements.

My collegue suggets to search on the web icp perkin elmer, because the manufacturers of instruments usually explain well also the technique

Thanks Bini for your suggestion. I have gone through in net got the idea NAA

PIXE, OC/EC, XAFS, XRF, CHNO and ICP are some methods of identifying elements. My focussed question which method suits well for compostion analysis like Ni0.1Co0.4Zn0.5Fe2O4 

Dear Sathishkumer,

when thinking of your problem I had the idea to use (on re-dissolved material, if this possible) something like chelatometry based ion-chromatography, as outlined e.g. in http://www.sciencedirect.com/science/article/pii/0021967393802557#

But I guess there should be maybe a "kit" around.....

Hope it helps....kind regards

Alfred

P.S. I am by no means an expert in this field - we recently worked on a related NMR problem (where I am an expert)...

I agree with Werner, EDX is a correct method for composition analysis with as low as 1% of experimental error. Of course, if you have EDD capable for O measurement (old generation EDD detected elements starting from Na).

In the attachment you can have a look of EDX spectrum of a piezoceramic...

Another option is XRD phase analysis

see http://iopscience.iop.org/0022-3727/40/7/004/pdf/0022-3727_40_7_004.pdf )

You can also try to get the XRF analysis, this technique will provide you the  composition (%) of each elements present in your compound. ICPMS analysis will work as well.