Namrata Pattanayak

5 Questions 9 Answers 0 Followers

Questions related from Namrata Pattanayak

Is it true that dopants with bigger ionic radii always leads to increase in lattice parameters?

MY sample is iron oxide doped with Zn and the lattice parameters I have determined from the Rietveld analysis. While the ionic radius of Zn is more than Fe, I found that compare to pristine...

12 July 2023 5,942 2 View

What information one can get from single crystal XRD with four circle diffractometer which one can not obtain from the powder XRD ?

In order to analyze the detail crystal structure including bond angle, bond length, lattice parameters, wickoff positions, thermal parameters, unit cell information etc. powder XRD followed by...

28 October 2021 6,931 6 View

Al doped alpha-Fe2O3 synthesis detail is attached herewith. Help me to evaluate the value of 'x' in the final product alpha- Fe2-x Alx O3 ?

I have tried doping Al in the alpha-Fe2O3 compound using wet chemical synthesis route. The synthesis procedure with precursor details is attached herewith. Please help me to evaluate the value of...

19 May 2021 6,185 3 View

I have a doubt regarding the origin of weak ferromagnetism in alpha-Fe2O3 and why it vanishes just below its Morin transition.

I have read already Dzyallonskii's paper as well Moriyas paper which is the two basic paper discussed and derived the reason of spin canting. However, I am finding it difficult to understand. I do...

22 May 2017 9,985 1 View

Can the anisotropic debye waller factors be negative?? Can one use it for the refinement of the synchrotron xrd data??

I am refining the room temperature synchrotron xrd of alpha -Fe2O3. The chi square I got is 3.14 and the lowering of chi square is only possible if I use anisotropic displacement parameter. After...

09 July 2016 8,755 7 View