Hello, I am a PhD student of "La Sapienza" University of Rome, I am carrying out as a function of doping and temperature a systematic study of the lattice modulation characterizing the high Tc superconductor Bi2212. The diffraction patterns were collected using synchrotron x-ray on high quality powder samples of Bi2212. Previously I have analized the average lattice structure with GSAS, but the refinement was not so good because of the strong super-lattice peaks. Thus now I am trying to refine with the FullProff program also the modulated structure, but I am run into some difficulties. The 4-dimensional superspace group is N Bbmb/1-11, but if I put in the .PCR file N B b m b / 1 -1 1 (in all formats) the FullProff program responds "Error in the S.G. symbol"! My questions are: Can FullProff understand the superspace group symbols or not? If yes in what format? There are other programs which can understand superspace group symbols? Thanks for the answers. Stefano
