Re: PO corrections in trigonal space groups?

Dear Mathew, The 104 plane in calcite corresponds to the most intense reflection that is related, in turn, to the best "spacing" or "separation" between atomic "layers" along which the cleavage may occur. This is not a strict rule, of course, as real cleavage planes may be different depending o

Re: PO corrections in trigonal space groups?

Thanks for your replies. Husin, is there any justification for the use of the 104 direction in calcite, other than this is the direction that works? I'm all for doing it if it works, but I'd like a little theoretical backup. Thanks Daniel. I'll put something together for a look-see. What correcti

Travel fellowship for US-based based scientists

I would like to pass on word that there are fellowships available for younger scientists based at US institutions (recipients need not be a US citizen) for the IUCr Congress in Montreal this August. Awardees must present their work – either as a poster or talk – at the Congress, and will be expe

RE: PO corrections in trigonal space groups?

Dear Matthew, Following to Professor Daniel Chateigner 's email, I would like to highlight briefly that the preferred orientation (PO) directions for calcite (CaCO3) that we used during the refinement using GSAS were · <104> for X-ray diffraction data, and · <001> for neutron

Re: PO corrections in trigonal space groups?

Hi Matthew, You would perhaps prefer physically meaningfull PO correction using standard functions, at disposal in Maud. If you can give me an ascii double column of your data I'll give it a trial. daniel Le 25/03/2014 11:43, Matthew Rowles a écrit : Hi all I have a sample containing a fra

PO corrections in trigonal space groups?

Hi all I have a sample containing a fraction of calcite. My research tells me that calcite cleaves on {10-11}. How can I express this as an hkl for the March-Dollase PO correction? By inspection, {104} is the direction that orients. Is that correct? How can I derive that? Thanks Matthew Rowl