On 02/19/2018 06:23 AM, Kaustubh Priolkar wrote:
We are trying to fit low temperature V K edge EXAFS data in V2O3. As per the cif files available (attached herewith – V2O3_10K data.cif) the structure is described by I2/a space group. When this file is read by ATOMS it gives an erroneous output ( attached herewith - feff.inp). In particular the values of V-O and V-V bond distances are not correct and do not match with bond distances reported in literature (Phys. Rev. B 2 (1970) 3771).

Could anyone tell me where am I making a mistake. I am aware that I2/a is a non standard space group but I am not sure if I need to take any precaution while reading the cif file in ATOMS.

Thanks and regards,

Hi Kaustubh,

Thanks for this bug report. This uncovered not one but two bugs in how Atoms handles monoclinic space groups. How economical! I will be pushing a fix to github soon and I will try to find some time to make a new windows installer.

I should point out that, even with the bug fix, the distances using the CIF file you attached will not match Phys. Rev. B 2 (1970) 3771.

The CIF file that you supplied is from doi:10.1016/S0022-4596(03)00295-0, which reports slightly different numbers for the undoped V2O3 compared to the 1970 paper. I have attached a feff.inp file that I think is correct.


 Bruce Ravel  ------------------------------------ bra...@bnl.gov

 National Institute of Standards and Technology
 Synchrotron Science Group at NSLS-II
 Building 743, Room 114
 Upton NY, 11973

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 Demeter:     http://bruceravel.github.io/demeter/

Attachment: V2O3_feff.inp
Description: chemical/gamess-input

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