Re: [sdpd] When R lowers why mot Rp

[Armel Le Bail <armel.le_bail...@univ-lemans.fr>]

>         I am trying the Al2O3 data for charge density construction as
>a prelude to my further studies in the same line. I am refining the
>data using JANA2000 where I get R lowers down with appropriate
>parameters but Rp remains higher at 32% and doesnt change much. What
>could be the possible mistakes I have commited. Why do we get Uiso
>negative? Kindly brief me on these.

Mistakes are as numerous as stars in the sky...
But I am not astrologer for trying to guess which one
exactly you have, even without seeing your data...
Without chicken entrails I can't make prophecies...

The advice is to start from files working already. No
example files with Jana ? Hope your Al2O3 is not
the NIST 1976 standard reference material showing
extreme preferred orientation ??? Did you measured
the powder pattern by yourself ? What geometry ?
Good statistics or not (bad statistics may lead to such high
Rp) ?

Best regards,

Armel





 
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