Dear all, I prepared a kind of layered rare-earth hydroxides powder sample, with which I hope I can make out the crystalline structure. There are something I am not sure: initially ,I indexed the XRD pattern to an orthorhombic unit cell with a Apple2 software, two or three peak fit not as good. So I think the sample might be crystallized in a monoclinic phase, or the there are some impurities contained in the powders. Could anyone give some advices how to determine cell parameters of a monoclinic phase, especially, the angles.
thanx! liang
