Hi Gustavo, Last year I started to work on identification of series of Al2O3 semiamorphous materials. Then this project was dropped. Meanwhile, I made brief research and my impression is that there is some chaos in the nomenclature of the Al-oxides. Aside of this, in PDF-2 database the situation it is also quite confusing and far away from prompt and reliable identification. Anyway, I've got the structures of 8 Al-oxides having different structures (2 gamma, 2 kappa, theta, sigma, eta and delta) and simulated their powder diffraction patterns with Powder Cell for Cu k-alpha radiation. If this may help you, I can send to you the these 8 raw-files in x_y format. At least they can be used as references for identification and distinguishing of various Al-oxides. Best regards, Srebri
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ Dr. Srebri Petrov, PXRD Lab Dept. of Chemistry, University of Toronto, Tel/Fax: 416-978-1389 ----- Original Message ----- From: "Gustavo A. Cifredo Chacón" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Friday, January 19, 2007 12:04 PM Subject: RE: chi alumina structure > Thank you very much for your time, > Excuse me, but I see that space group and cell dimensions are the same of a > Kappa- Al2O3 included in the ICSD. Are you sure that it is chi-Al2O3, not > kappa? Which is the reference of the data? > > Thank you again. > > > At 12:19 19/01/2007 +0000, you wrote: > > Dear Gustavo, > > > >the cell (space group Pna21) should be: > > > >4.834 x 8.3096 x 8.9353 > > > >Structure: > > > > > > Al1 0.1778 0.8383 0.6466 > > Al2 0.330700 0.024500 0.3775 > > Al3 0.313800 0.350200 0.5713 > > Al4 0.315600 0.657600 0.3734 > > O1 0.479600 0.852900 0.4977 > > O2 0.508500 0.508900 0.505 > > O3 0.162700 0.163200 0.2429 > > O4 0.154400 0.495300 0.2656 > > O5 -0.020200 0.323100 0.5166 > > O6 0.163800 0.841000 0.2708 > > > > > >I hope this will help you, > >good luck, > >marco > > > > > > > >-----Original Message----- > >From: "Gustavo A. Cifredo Chacón" [mailto:[EMAIL PROTECTED] > >Sent: 19 January 2007 11:38 > >To: [email protected] > >Subject: chi alumina structure > > > >I am looking for chi-Al2O3 structural data, i.e. atomic position and > >spacial group. > >Any information will be wellcome. > > > >Thank you in advance. > > > >Gustavo Cifredo > >956 016155 > >CASEM-Puerto Real > >Universidad de Cadiz, Spain > > Gustavo Cifredo > 956 016155 > CASEM-Puerto Real > Universidad de Cadiz, Spain > > >
