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*data for   ICSD #16258
Coll Code   16258
Rec  Date   1980/01/01
Mod  Date   2005/10/01
Chem Name   Dicalcium Germanate
Structured  Ca2 (Ge O4)
Sum         Ca2 Ge1 O4
ANX         AB2X4
D(calc)     4.43
Title       The crystal chemistry of dense M2 O4 polymorphs: High pressure Ca2 Ge
            O4 of K2 Ni F4 structure type
Author(s)   Reid, A.F.;Ringwood, A.E.
Reference   Journal of Solid State Chemistry
            (1970), 1, 557-565
            Golden Book of Phase Transitions, Wroclaw
            (2002), 1, 1-123
Unit Cell   3.700(5) 3.700(5) 11.88(1) 90. 90. 90.
Vol         162.64
Z           2
Space Group I 4/m m m
SG Number   139
Cryst Sys   tetragonal
Pearson     tI14
Wyckoff     e2 c a
R Value     .218
Red Cell    I  3.7 3.7 6.490 106.560 106.560 89.999 81.319
Trans Red   1.000 0.000 0.000 / 0.000 -1.000 0.000 / -0.500 0.500 -0.500
Comments    Stable up to 800 K (2nd ref., Tomaszewski), above P212121
            The structure has been assigned a PDF number (experimental
            powder diffraction data): 72-818
            Structure type : K2MgF4
            X-ray diffraction (powder)
            At least one temperature factor missing in the paper.
Atom  #   OX   SITE      x           y           z           SOF      H
Ge   1  +4    2 a   0           0           0              1.         0   
Ca   1  +2    4 e   0           0           0.353(5)       1.         0   
O    1  -2    4 c   0.5         0           0              1.         0   
O    2  -2    4 e   0           0           0.162(15)      1.         0   
*end for    ICSD #16258
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