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["Nuno A. G. Bandeira" <nuno.bandeira@ist.utl.pt>]

Attached you will find various alotropes of Al2O3, from diffraction data 
taken at various temperatures. They are the most recent structures from 
the ICSD database.

I trust you have no problem visualizing *.cif files.

Regards,

--
Nuno A. G. Bandeira, AMRSC
Graduate researcher and molecular sculptor
Inorganic and Theoretical Chemistry Group,
Faculty of Science
University of Lisbon - C8 building, Campo Grande,
1749-016 Lisbon,Portugal
http://cqb.fc.ul.pt/intheochem/nuno.html
Doctoral student @ IST,Lisbon
--

Attachment: Al2O3.cif
Description: CIF chemical test

*data for   ICSD #92631
CopyRight   ©2006 by Fachinformationszentrum Karlsruhe, and the U.S. 
Secretary of 
            Commerce on behalf of the United States.  All rights reserved.
Coll Code   92631
Rec  Date   2003/04/01
Chem Name   Aluminium Oxide - Alpha
Structured  Al2 O3
Sum         Al2 O3
ANX         A2X3
Min Name    Corundum
D(calc)     3.98
Title       Recovering experimental and theoretical electron densities in 
            corundum using the multipolar model : IUCr multipole refinement 
            project
Author(s)   Pillet, S.;Souhassou, M.;Lecomte, C.;Schwarz, K.;Blaha, P.;
            Rerat, M.;Lichanot, A.;Roversi, P.
Reference   Acta Crystallographica A (39,1983-)
            (2001), 57, 290-303
            Acta Crystallographica B (39,1983-)
            (1998), 54, 193-195
Unit Cell   4.7602(4) 4.7602(4) 12.993(2) 90 90 120
Vol         254.97
Z           6
Space Group R -3 c H
SG Number   167
Cryst Sys   trigonal/rhombohedral
Pearson     hR10
Wyckoff     e c
R Value     0.014
Red Cell    RH 4.760 4.760 5.129 62.353 62.353 60 84.99
Trans Red   0.000 1.000 0.000 / 1.000 1.000 0.000 / 0.333 0.667 -0.330
Comments    Electron structure calculation 
            Compound with mineral name: Corundum
            New refinement based on previously measured intensities 
            Temperature in Kelvin: 120
            Structure type : Al2O3
Atom  #   OX   SITE      x           y           z           SOF      H 
 Al   1  +3    12 c  0.          0.          0.352100(9)    1.         0    
 O    1  -2    18 e  0.30626(2)  0.          0.250          1.         0    
Lbl  Type      U11         U22         U33         U12         U13         U23
Al1  Al3+ 0.00117(3)  0.00117(3)  0.00146(4)  0.00058(2)  0.          0.      
    
O1   O2-  0.00168(1)  0.00168(1)  0.00208(3)  0.00084(1)  0.000217(1) 
0.000434(2) 
*end for    ICSD #92631


*data for   ICSD #93096
CopyRight   ©2006 by Fachinformationszentrum Karlsruhe, and the U.S. 
Secretary of 
            Commerce on behalf of the United States.  All rights reserved.
Coll Code   93096
Rec  Date   2003/04/01
Chem Name   Dialuminium Trioxide - Alpha
Structured  Al2 O3
Sum         Al2 O3
ANX         A2X3
Min Name    Corundum
D(calc)     3.98
Title       Rietveld refinements on laboratory energy dispersive X-ray 
            diffraction (EDXD) data
Author(s)   Ballirano, P.;Caminiti, R.
Reference   Journal of Applied Crystallography
            (2001), 34, 757-762
Unit Cell   4.7599(5) 4.7599(5) 12.994(2) 90 90 120
Vol         254.96
Z           6
Space Group R -3 c H
SG Number   167
Cryst Sys   trigonal/rhombohedral
Pearson     hR10
Wyckoff     e c
R Value     0.02
Red Cell    RH 4.759 4.759 5.129 62.356 62.356 60 84.986
Trans Red   0.000 1.000 0.000 / 1.000 1.000 0.000 / 0.333 0.667 -0.330
Comments    Compound with mineral name: Corundum
            Rietveld profile refinement applied 
            Structure type : Al2O3
            X-ray diffraction (powder) 
Atom  #   OX   SITE      x           y           z           SOF      H       
 ITF(B)    
 Al   1  +3    12 c  0.          0.          0.35241(8)     1.         0      
   0.50(2)
 O    1  -2    18 e  0.3063(4)   0.          0.250          1.         0      
   0.40(3)
*end for    ICSD #93096


*data for   ICSD #94485
CopyRight   ©2006 by Fachinformationszentrum Karlsruhe, and the U.S. 
Secretary of 
            Commerce on behalf of the United States.  All rights reserved.
Coll Code   94485
Rec  Date   2003/10/01
Chem Name   Aluminium Oxide - Kappa
Structured  Al2 O3
Sum         Al2 O3
ANX         A2X3
Min Name    Alumina kappa
D(calc)     3.77
Title       A new Rietveld refinement of kappa-(Al2 O3)
Author(s)   Smrcok, L.;Langer, V.;Halvarsson, M.;Ruppi, S.
Reference   Zeitschrift fuer Kristallographie (149,1979-)
            (2001), 216, 409-412
Unit Cell   4.8340(1) 8.3096(2) 8.9353(2) 90 90 90
Vol         358.92
Z           8
Space Group P n a 21
SG Number   33
Cryst Sys   orthorhombic
Pearson     oP40
Wyckoff     a10
R Value     0.13
Red Cell    P  4.834 8.309 8.935 90 90 90 358.919
Trans Red   1.000 0.000 0.000 / 0.000 1.000 0.000 / 0.000 0.000 1.000
Comments    Compound with mineral name: Alumina kappa
            Rietveld profile refinement applied 
            X-ray diffraction (powder) 
Atom  #   OX   SITE      x           y           z           SOF      H       
 ITF(B)    
 Al   1  +3    4 a   0.1778(17)  0.8383(5)   0.6466(5)      1.         0      
    3.9(2)
 Al   2  +3    4 a   0.3307(10)  0.0245(7)   0.3775(6)      1.         0      
    2.7(1)
 Al   3  +3    4 a   0.3138(10)  0.3502(6)   0.5713(6)      1.         0      
    1.3(1)
 Al   4  +3    4 a   0.3156(10)  0.6576(6)   0.3734(7)      1.         0      
    4.2(2)
 O    1  -2    4 a   0.4796(14)  0.8529(9)   0.4977(8)      1.         0      
    2.9(4)
 O    2  -2    4 a   0.5085(15)  0.5089(9)   0.5050(8)      1.         0      
    3.4(6)
 O    3  -2    4 a   0.1627(16)  0.1632(11)  0.2429(8)      1.         0      
    0.6(3)
 O    4  -2    4 a   0.1544(19)  0.4953(12)  0.2656(11)     1.         0      
    5.8(5)
 O    5  -2    4 a   -0.0202(15) 0.3231(10)  0.5166(11)     1.         0      
    0.7(3)
 O    6  -2    4 a   0.1638(17)  0.8410(10)  0.2708(6)      1.         0      
    2.3(3)
*end for    ICSD #94485


*data for   ICSD #99783
CopyRight   ©2006 by Fachinformationszentrum Karlsruhe, and the U.S. 
Secretary of 
            Commerce on behalf of the United States.  All rights reserved.
Coll Code   99783
Rec  Date   2005/04/01
Chem Name   Aluminium Oxide - Alpha
Structured  Al2 O3
Sum         Al2 O3
ANX         N2O3
D(calc)     3.89
Title       High-temperature synchrotron X-ray diffraction study of phases in 
a 
            gamma Ti Al alloy
Author(s)   Novoselova, T.;Malinov, S.;Sha, W.;Zhecheva, A.
Reference   Materials Science and Engineering
            (2004), 371, 103-112
Unit Cell   4.7949 4.7949 13.0995 90 90 120
Vol         260.82
Z           6
Space Group R -3 c H
SG Number   167
Cryst Sys   trigonal/rhombohedral
Pearson     hR10
Wyckoff     e c
Red Cell    RH 4.794 4.794 5.170 62.372 62.372 60 86.941
Trans Red   0.000 1.000 0.000 / 1.000 1.000 0.000 / 0.333 0.667 -0.330
Comments    Rietveld profile refinement applied 
            Synchrotron radiation (powder) 
            Temperature in Kelvin: 1200
            Structure type : Al2O3
            No R value given in the paper.
            At least one temperature factor missing in the paper.
Atom  #   OX   SITE      x           y           z           SOF      H 
 Al   1  +0    12 c  0.          0.          0.35274        1.         0    
 O    1  +0    18 e  0.8333      0.          0.25           1.         0    
*end for    ICSD #99783


*data for   ICSD #151590
CopyRight   ©2006 by Fachinformationszentrum Karlsruhe, and the U.S. 
Secretary of 
            Commerce on behalf of the United States.  All rights reserved.
Coll Code   151590
Rec  Date   2006/10/01
Chem Name   Aluminium Oxide - Hp
Structured  Al2 O3
Sum         Al2 O3
ANX         A2X3
D(calc)     5.35
Title       Crystal structure of a high-pressure/high-temperature phase of 
            alumina by in situ X-ray diffraction
Author(s)   Lin Jung-Fu;Degtyareva, O.;Prewitt, C.T.;Dera, P.;Sata, N.;
            Gregoryanz, E.;Mao Ho-Kwang;Hemley, R.J.
Reference   Nature Materials
            (2004), 3, 389-393
Unit Cell   6.393(1) 4.362(1) 4.543(1) 90. 90. 90.
Vol         126.69
Z           4
Space Group P b c n
SG Number   60
Cryst Sys   orthorhombic
Pearson     oP20
Wyckoff     d2 c
Red Cell    P  4.362 4.543 6.393 90 89.999 89.999 126.687
Trans Red   0.000 1.000 0.000 / 0.000 0.000 -1.000 / -1.000 0.000 0.000
Comments    There is a coexistent corundum-type phase (collectio 
            no.151589)
            Pressure in MPa: 113000
            Rietveld profile refinement applied 
            Temperature in Kelvin: 300
            Structure type : Rh2S3
            X-ray diffraction (powder) 
            No R value given in the paper.
            At least one temperature factor missing in the paper.
Atom  #   OX   SITE      x           y           z           SOF      H 
 Al   1  +3    8 d   0.114       0.758       0.028          1.         0    
 O    1  -2    8 d   0.849       0.619       0.120          1.         0    
 O    2  -2    4 c   0.          0.046       0.250          1.         0    
*end for    ICSD #151590