Nb2O5 exists with several different structures, and this is further complicated by the existence of many non-stoichiometric forms containing some amount of Nb4+. If you are attempting this with powder diffraction alone, especially X-ray powder diffraction, you will have problems :-)
Electron diffraction and microscopy has been the most powerful method for understanding the structures of non-stoichiometric heavy metal oxides, as pioneered by Wadsley's group in Melbourne. A recent article (2007) by Zandbergen and Cava's group in Princeton summarises some of what is currently known with a useful list of references. See: http://arxiv.org/pdf/0708.0673 ICSD contains 9 structures for the supposedly stoichiometric form alone, and 42 articles for niobium oxide. Alan. Devendra Bhange said: > Hi, > I am in need of cif file of Nb2O5 structure. I have the cif file of > modified Nb2O5 at high pressure which is monoclinic. I want its unmodified > form of Structure. Please send me any reference title or source where from > I can get it. Thanking you in advance. > > Sincerely yours.... > > D.S. Bhange ______________________________________________ Dr Alan Hewat, NeutronOptics, Grenoble, FRANCE <[EMAIL PROTECTED]> +33.476.98.41.68 http://www.NeutronOptics.com/hewat ______________________________________________
