Good work Armel. Yes, sharing of open databases is encouraged :-) But
please don't attach files.

Alan
_____________________________________________________
  From my mobile telephone
 Dr Alan Hewat, NeutronOptics, Grenoble, FRANCE
<alan.he...@neutronoptics.com> +33.476.98.41.68
  http://www.NeutronOptics.com/hewat
_____________________________________________________
On 15 Jun 2016 15:57, "xtal" <x...@noos.fr> wrote:

> At 17:21 14/06/2016 +0200, you wrote:
>
> So far as I know (I may be wrong :-) ordered atomic positions for the two
> requested compounds, with supposed formulae *Ba2TeO4 *and *Ba2TeO5*,
> have not been determined. The closest I found were as I wrote:Â *"Sr Te
> O6 and Ba Te O6
> <https://www.researchgate.net/publication/244748863_Sr3TeO6_and_Ba3TeO6_Double_perovskites_with_pronounced_superstructures>"
> *and *"Sr Te O4
> <http://scripts.iucr.org/cgi-bin/getarticleid?issn=0108-2701&volume=41&fpage=1558&details=yes>".
> *I understand that unit cells and space groups have been assigned, but
> that is not sufficient.
>
> If I am wrong, and ordered structures with this stoichiometry have indeed
> been determined, I hope people who have access to the databases will
> confirm that these structures actually exist, to save Rachid time and
> money. Otherwise it is not permitted to share or promote commercial
> databases on the Rietveld list.
>
> Alan.
>
>
> Hi Alan,
>
> If I understand well, sharing or promoting open databases is permitted on
> the Rietveld list...
>
> About Ba2TeO5, it is said that it is isomorphous with Ba2WO5 and Sr2WO5.
> Ba2WO5 belongs to the K2VO2F3 structure type which is described in an
> Acta Cryst B issue and available as an entry in the Crystallography Open
> Database :
> http://www.crystallography.net/cod/2020524.html
>
> It is orthorhombic pseudo-tetragonal with 2b~c
> Ba2TeO5 was originally indexed as tetragonal or possibly orthorhombic.
>
> So, here are very probably starting atomic positions for Ba2TeO5 ;-)
>
> Best,
> Armel
>



-- 
______________________________________________
*   Dr Alan Hewat, NeutronOptics, Grenoble, FRANCE *
<alan.he...@neutronoptics.com> +33.476.98.41.68
        http://www.NeutronOptics.com/hewat
______________________________________________
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Please do NOT attach files to the whole list <alan.he...@neutronoptics.com>
Send commands to <lists...@ill.fr> eg: HELP as the subject with no body text
The Rietveld_L list archive is on http://www.mail-archive.com/rietveld_l@ill.fr/
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Reply via email to