*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,
*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
清华材料FTP有,用google搜吧。
小弟急求ICSD数据库,gdydh@hotmail.com
帮你查是可以的.
要破解版的ICSD却没有.
小弟是菜鸟,楼上的哥哥,能不能帮小弟查一下 γ-Ca2GeO4 的结构(主要是原子坐标)?,感激之至
小弟写文章就差个结构图了,找了n多地方都找不到。
jiangzq05@st.lzu.edu.cn
好象查不到啊.
下面这个好象不是啊
*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,
*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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