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*data for   ICSD #78331
CopyRight   ?2005 by Fachinformationszentrum Karlsruhe, and the U.S. Secretary of
            Commerce on behalf of the United States.  All rights reserved.
Coll Code   78331
Rec  Date   1996/04/22
Mod  Date   1999/01/19
Chem Name   Manganese Oxide - Gamma
Structured  Mn O2
Sum         Mn1 O2
ANX         AX2
Min Name    Ramsdellite
D(calc)     4.88
Title       A powder neutron diffraction study of lambda and gamma manganese
            dioxide and of Li Mn2 O4
Author(s)   Fong, C.;Kennedy, B.J.;Elcombe, M.M.
Reference   Zeitschrift fuer Kristallographie (149,1979-)
            (1994), 209, 941-945
Unit Cell   9.3229(11) 4.4533(7) 2.8482(3) 90. 90. 90.
Vol         118.25
Z           4
Space Group P n a m
SG          PNAM
SG Number   62
Cryst Sys   orthorhombic
Laue Class  mmm
Pearson     oP12
Wyckoff     c3
R Value     .0427
Symmetry      1            x+.5, -y+.5, z
              2            x, y, -z+.5
              3            -x+.5, y+.5, z+.5
              4            -x, -y, -z
              5            -x+.5, y+.5, -z
              6            -x, -y, z+.5
              7            x+.5, -y+.5, -z+.5
              8            x, y, z
Red Cell    P  2.848 4.453 9.322 90 89.999 89.999 118.251
Trans Red   0.000 0.000 -1.000 / 0.000 1.000 0.000 / 1.000 0.000 0.000
Comments    PDF 44-142. R(Bragg)=0.0134
            Compound with mineral name: Ramsdellite
            Neutron diffraction (powder)
            The structure has been assigned a PDF number: 44-142.
            Rietveld profile refinement applied
            Calculated density unusual but tolerable.
Atom  #   OX   SITE      x           y           z           SOF      H        ITF(U)   
Mn   1  +4    4 c   0.1203(15)  0.0130(33)  0.25           1.         0               0
O    1  -2    4 c   0.0356(15)  0.2311(15)  0.75           1.         0        0.025(3)
O    2  -2    4 c   0.2842(12)  0.2934(20)  0.25           1.         0               0
Lbl  Type      U11         U22         U33         U12         U13         U23
Mn1  Mn4+ 0.020(4)    0.029(5)    0.017(3)    0.013(4)    0           0           
O2   O2-  0.006(3)    0.050(5)    0.008(3)    -.027(3)    0           0           
*end for    ICSD #78331

[ Last edited by cenwanglai on 2010-6-3 at 22:49 ]
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