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*data for   ICSD #39157
Coll Code   39157
Rec  Date   1986/12/03
Mod  Date   2005/10/01
Chem Name   Dicalcium Germanium(IV) Oxide - Alpha
Structured  Ca2 Ge O4
Sum         Ca2 Ge1 O4
D(calc)     3.82
Title       Crystal structure analysis of alpha-Ca2 Ge O4
Author(s)   Udagawa, S.;Urabe, K.;Katayama, K.
Reference   Semento Hijutsu Nempo
            (1976), 30, 37-41
            Golden Book of Phase Transitions, Wroclaw
            (2002), 1, 1-123
Unit Cell   5.507(2) 5.507(2) 7.171(4) 90. 90. 120.
Vol         188.34
Z           2
Space Group P 63 m c
SG Number   186
Cryst Sys   hexagonal
Pearson     hP14
Wyckoff     d b2 a
Red Cell    P  5.507 5.507 7.171 90 90 120 188.339
Trans Red   1.000 0.000 0.000 / 0.000 1.000 0.000 / 0.000 0.000 1.000
Comments    Weak satellite reflections were ignored in the structure
            analysis.
            stabilized by adding B2 O3
            Stable above 1740 K (2nd ref., Tomaszewski), below P212121
            The structure has been assigned a PDF number (experimental
            powder diffraction data): 23-1039
            X-ray diffraction from single crystal
            No R value given in the paper.
            Position of 8 Elements of O Are Undetermined.
Atom  #   OX   SITE      x           y           z           SOF      H        ITF(B)   
Ca   1  +2    2 b   0.3333      0.6667      0.796(11)      1.         0             6.4
Ca   2  +2    2 a   0           0           0.028(4)       1.         0            4.11
Ge   1  +4    2 b   0.3333      0.6667      0.276(5)       1.         0            3.66
*end for    ICSD #39157
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