I am working on hexaferrites

Hello Mam

 I am also doing work in Hexaferrites. This is higher intensity peak??  Please  mention in your  at least three undetermined peaks position. I think you can not say with in one peak position, which is this?? My experience  is mostly 27 peak is absent in Fe2O3. 

2theta at 27 using CuK-alpha radiation may not be due to hematite or maghemite.

Alpha-Fe2O3 (hematite) high intensities are at 24.164, 33.279, 35.743, 40.990, 49.583, 54.196, 62.538 and 64.127.

Gamma-Fe2O3 (maghemite) high intensities are at 23.894, 26.204, 30.335, 35.743, 43.428, 50.136, 57.478 and 63.106.

Dr Rao,

Dear Dr Rao,

I have found (hkl) of the strange peak at 27 is (004), If it is not gamma or alpha then what else peak?

I am trying to check with other software

thanks for reply

My student found it as W-type  having hkl (0010), is it possible?

 Dr A P Singh

thanks for your reply

regards

You may find your answer through these papers:

1. http://dx.doi.org/10.1039/c3ce41269e

2.J. Mater. Chem., 2012,22, 12198-12204

   DOI: 10.1039/C2JM31053H 

Sometimes, in the case of less quantity of powder filled in the metallic sample holder, a peak(s) from the sample holder came into the picture. Have you checked for that too?

Prof Jotania. 

If you find only one peak which does not match with the peaks  of standard pattern of the desired compound then there is potential possibility of it arising out from the material on which the sample was loaded for obtaining X-Ray data. Views of the other experts may also be taken care. Best luck. 

Respected Dr Bichile and Savan,

Yes, all possibilities I am checking, but i have prepared M type hexaferrites using ceramic technique, calcined at 1250 for 20 hrs. X = 0.0 and 0.2 samples confirms formation of M type ferrites, but x = 0.4 samples onward peak at 27 deg appear, i hv match with various software and found it is W-type BaCo2Fe16O19, so it means W phase formed?

thanks for suggessions

regards

Hello Mam

The formula of W-type is  BaCo2Fe16O27 . For more long time heating, it is possibility the formation of Z- type and it decompose into W-type hexaferrite. 20 hr is  much more time.  I know from literature the more holding time give the formation of Z-type. 

Dear Dr Anoop Singh,

thanks for reply. OK this is very important suggestion, should i check for Z-type phase?

with best regards

Please Repeat  your experiment with 20hr and sample put out from furnace at room temperature after decreasing 1000C. this peak automatically  disappeared. 

Dr Aroopji

thanks for suggession. OK let us see

regards

No iron oxides present diffraction peaks at that angle. It could be alfa-BaFe2O4?

Dear Marcellena

    thanks for suggession. I will check

regards