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3Â¥2008-10-30 13:27:08
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СµÜÊDzËÄñ£¬Â¥Éϵĸç¸ç,Äܲ»ÄܰïСµÜ²éһϠ¦Ã-Ca2GeO4 µÄ½á¹¹£¨Ö÷ÒªÊÇÔ×Ó×ø±ê£©£¿£¬¸Ð¼¤Ö®ÖÁ СµÜдÎÄÕ¾Ͳî¸ö½á¹¹Í¼ÁË£¬ÕÒÁËn¶àµØ·½¶¼ÕÒ²»µ½¡£ jiangzq05@st.lzu.edu.cn |
5Â¥2008-11-13 15:40:00
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ºÃÏó²é²»µ½°¡. ÏÂÃæÕâ¸öºÃÏó²»Êǰ¡ *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 |

6Â¥2008-11-13 18:05:41
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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 |

7Â¥2008-11-13 18:06:21
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