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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Contributions on thermal behaviour and crystal chemistry of anhydrous phosphates. XXXXI - Refinement of the superstructure of FeTi4(PO4)(6) - An example of a highly ordered member of the NASICON structure family
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Contributions on thermal behaviour and crystal chemistry of anhydrous phosphates. XXXXI - Refinement of the superstructure of FeTi4(PO4)(6) - An example of a highly ordered member of the NASICON structure family

机译:对无水磷酸盐的热行为和晶体化学的贡献。 XXXXI-FeTi4(PO4)(6)的上层结构的细化-NASICON结构家族的高度有序成员的一个例子

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Single crystals of NASICON type phosphates (Mn1.65TiV)-V-III/I (4)(PO4)(6) (black), FeTi4(PO4)(6) (orange-red) and CoTi4(PO4)(6) (lavender colour) were grown by chemical vapour transport. The crystal structures of Mn1.65Ti4(PO4)(6) and FeTi4(PO4)6 were refined from single crystal data. For the first time a superstructure for a NASICON type phosphate of general formula A(II)B(4)(IV)(PO4)(6) is observed and successfully refined (FeTi4(PO4)(6) [data for Mn1.65Ti4(PO4)(6) in brackets] rhombohedral, R32 [R (3) over bar], Z = 6 (3), a = 8.5164(8) [8.5575(17)] angstrom, c = 41.852(6) [20.898(5)] angstrom, R-1 = 0.053 [0.025], wR(2) = 0.136 [0.061], 2598 [1261] independent reflections, 109 [59] variables). For FeTi4(PO4)(6) a structure with a highly ordered cation distribution among the octahedral voids and crystal chemical reasonable interatomic distances (2.18 <= d(Fe-II-O) <= 2.20) results. SXRD investigations on CoTi4(PO4)(6) reveal also the presence of a superstructure along the NASICON c-axis (c'= 5c(NASICON)). A Dew description of the NASICON structure based on group-subgroup considerations shows its close relationship to the NiAs structure (3 x NiAs double right arrow 3 x AX double right arrow AB(2)(XO4)(3) double right arrow square AB(4)(XO4)(6)).
机译:NASICON型磷酸盐(Mn1.65TiV)-V-III / I(4)(PO4)(6)(黑色),FeTi4(PO4)(6)(橙红色)和CoTi4(PO4)(6)的单晶(薰衣草色)通过化学蒸气传输生长。 Mn1.65Ti4(PO4)(6)和FeTi4(PO4)6的晶体结构由单晶数据精制而成。首次观察到NASICON型通式A(II)B(4)(IV)(PO4)(6)的磷酸盐的上层结构并成功地精制(FeTi4(PO4)(6)[Mn1.65Ti4的数据(PO4)(6)中的括号]菱面体,R32 [R(3)超过小节],Z = 6(3),a = 8.5164(8)[8.5575(17)]埃,c = 41.852(6)[20.898 (5)埃,R-1 = 0.053 [0.025],wR(2)= 0.136 [0.061],2598 [1261]个独立反射,109 [59]个变量)。对于FeTi4(PO4)(6),其结构在八面体空隙之间具有高度有序的阳离子分布,并且晶体化学合理的原子间距离(2.18 <= d(Fe-II-O)<= 2.20)。 SXRD对CoTi4(PO4)(6)的研究还揭示了沿NASICON c轴(c'= 5c(NASICON))的上部结构的存在。基于组-子组考虑的NASICON结构的露水描述显示了其与NiAs结构的紧密关系(3 x NiAs双右箭头3 x AX双右箭头AB(2)(XO4)(3)双右箭头正方形AB( 4)(XO4)(6))。

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