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chinaworm专家顾问 (知名作家)
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[求助]
碳酸镧I型和II型结构 空间群等参数求助已有1人参与
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1)本人在Findit查询到有下面的一个II型的La (C O3) (O H),但是尝试计算 rietveld模拟的时候,老是说空间群unusual space group,求解: *data for ICSD #4242 Coll Code 4242 Rec Date 1980/01/01 Mod Date 1999/01/19 Chem Name Dilanthanum Bis(carbonate) Dihydroxide Structured La2 (C O3)2 (O H)2 Sum C2 H2 La2 O8 ANX ABX4 Min Name Ancylite (Ce) D(calc) 4.59 Title The crystal structure of ancylite, (RE)x (Ca, Sr)2-x (C O3)2 (O H)x (2-x)(H2 O) Author(s) dal Negro, A.;Rossi, G.;Tazzoli, V. Reference American Mineralogist (1975), 60, 280-284 Unit Cell 5.03(1) 8.52(1) 7.29(1) 90. 90. 90. Vol 312.42 Z 2 Space Group P m c n SG Number 62 Cryst Sys orthorhombic Pearson oP28 Wyckoff d c4 R Value .059 Red Cell P 5.03 7.29 8.52 89.999 89.999 90 312.417 Trans Red 1.000 0.000 0.000 / 0.000 0.000 1.000 / 0.000 -1.000 0.000 Comments Compound with mineral name: Ancylite (Ce) The structure has been assigned a PDF number: 29-384 Calculated density unusual but tolerable. Position of 4 Elements of H Are Undetermined. Atom # OX SITE x y z SOF H La 1 +3 4 c 0.25 0.3399(1) 0.6476(1) 1. 0 C 1 +4 4 c 0.75 0.1905(14) 0.8099(18) 1. 0 O 1 -2 4 c 0.75 0.3181(12) 0.7210(16) 1. 0 O 2 -2 8 d 0.5297(14) 0.1218(8) 0.852(1) 1. 0 O 3 -2 4 c 0.25 0.4135(14) 0.9749(14) 1. H1 Lbl Type Beta11 Beta22 Beta33 Beta12 Beta13 Beta23 La1 La3+ 0.0083(3) 0.0025(1) 0.0039(1) 0 0 -.0002(1) C1 C4+ 0.0083(41) 0.0011(12) 0.0056(20) 0 0 0.0011(13) O1 O2- 0.0160(39) 0.0052(13) 0.0108(20) 0 0 0.0037(14) O2 O2- 0.0123(25) 0.0055(9) 0.0085(12) -.0017(13) 0.0008(15) 0.0006(8) O3 O2- 0.0318(52) 0.0093(16) 0.0063(16) 0 0 0.0038(14) *end for ICSD #4242 2)还要求一个I型碳酸镧La (C O3) (O H)的晶体结构、原子占位等,这个在pdf卡片库图中与00-024-0815匹配,为Hexagonal结构,希望可以在findit里面查到的虫子帮忙,谢谢 注:如果确实是有用,本人将愿意再多加100个金币作为酬谢 |
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jerkwin
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【答案】应助回帖
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感谢参与,应助指数 +1
sunyang1988: 金币+1, 谢谢帮助 2013-12-27 09:01:33
感谢参与,应助指数 +1
sunyang1988: 金币+1, 谢谢帮助 2013-12-27 09:01:33
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II的cif文件如下, I的2009版本查不到 data_4242-ICSD #?2009 by Fachinformationszentrum Karlsruhe, and the U.S. Secretary of #Commerce on behalf of the United States. All rights reserved. _database_code_ICSD 4242 _audit_creation_date 1980/01/01 _audit_update_record 1999/01/19 _chemical_name_systematic ; Dilanthanum Bis(carbonate) Dihydroxide ; _chemical_formula_structural 'La2 (C O3)2 (O H)2' _chemical_formula_sum 'C2 H2 La2 O8' _chemical_name_mineral Ancylite-(Ce) _publ_section_title ; The crystal structure of ancylite, (RE)x (Ca, Sr)2-x (C O3)2 (O H)x (2-x)(H2 O) ; loop_ _citation_id _citation_journal_abbrev _citation_year _citation_journal_volume _citation_page_first _citation_page_last _citation_journal_id_ASTM primary 'American Mineralogist' 1975 60 280 284 AMMIAY _publ_author_name ; dal Negro, A.;Rossi, G.;Tazzoli, V. ; _cell_length_a 5.03(1) _cell_length_b 8.52(1) _cell_length_c 7.29(1) _cell_angle_alpha 90. _cell_angle_beta 90. _cell_angle_gamma 90. _cell_volume 312.42 _cell_formula_units_Z 2 _symmetry_space_group_name_H-M 'P m c n' _symmetry_Int_Tables_number 62 _refine_ls_R_factor_all .059 loop_ _symmetry_equiv_pos_site_id _symmetry_equiv_pos_as_xyz 1 'x, -y+.5, z+.5' 2 '-x+.5, y, z' 3 'x+.5, y+.5, -z+.5' 4 '-x, -y, -z' 5 '-x, y+.5, -z+.5' 6 'x+.5, -y, -z' 7 '-x+.5, -y+.5, z+.5' 8 'x, y, z' loop_ _atom_type_symbol _atom_type_oxidation_number C4+ 4 H1+ 1 La3+ 3 O2- -2 loop_ _atom_site_label _atom_site_type_symbol _atom_site_symmetry_multiplicity _atom_site_Wyckoff_symbol _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_attached_hydrogens La1 La3+ 4 c 0.25 0.3399(1) 0.6476(1) 1. 0 C1 C4+ 4 c 0.75 0.1905(14) 0.8099(18) 1. 0 O1 O2- 4 c 0.75 0.3181(12) 0.7210(16) 1. 0 O2 O2- 8 d 0.5297(14) 0.1218(8) 0.852(1) 1. 0 O3 O2- 4 c 0.25 0.4135(14) 0.9749(14) 1. 1 #Position of 4 Elements of H Are Undetermined. #End of data_4242-ICSD |
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