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sxy5306鐵桿木蟲 (著名寫手)
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[交流]
【求助】晶體結(jié)構(gòu)翻譯!
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應(yīng)急——晶體結(jié)構(gòu)翻譯! SrLn2O4 (Ln = Gd, Dy–Yb) : These compounds have a crystal structure with a triangle-based array of Ln ions: the honeycomb-like structure formed by zigzag chains consisting of edge-shared Ln3 triangles.It is reported that the rare earth occupies the two point sites allowed in the structure (Cs symmetry), with the trivalent europium as local probe. The AR2O4 crystals are isostructural to CaFe2O4, which belongs to an orthogonal structurewith space groupPnmaand contains four formula units for a total of 28 atoms. All of the constituent atoms occupy 4c sites according to the Wyckoff notation. The orthogonal structure is constructed by a R2O4-framework of double octahedral and A-atoms residing within the framework with the bicapped trigonal prismatic site. The A-atoms coordinated by eight oxygen atoms, the rare earth atoms R occupy two different kind of symmetry sites, each coordinated by six oxygen atoms, and the oxygen atoms are fivefold coordinated. Fig. 1 shows the structure of SrY2O4. |
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這些化合物有一個三角形的稀土離子的晶體陣列結(jié)構(gòu):邊共享的稀土離子三角形組成的的鋸齒鏈形成蜂窩狀結(jié)構(gòu)。據(jù)報道,稀土占據(jù)了允許的兩個位置(Cs對稱性)三價銪作為位置探針。 AR2O4和CaFe2O4 晶體是同構(gòu)體,屬于正交晶系,空間群是Pnma,共四個單元結(jié)構(gòu),包含28個原子。根據(jù)懷科夫符號,所有的組成原子占據(jù)4c位置。正交結(jié)構(gòu)是由一個雙八面體和A-原子在雙帽三角棱柱中間所組成的R2O4 結(jié)構(gòu)。A原子由八個氧原子配位,稀土原子R占據(jù)兩種對稱的站點,每個稀土金屬由6個氧原子配位,而氧原子五配位的。圖1顯示了SrY2O4的結(jié)構(gòu)。 |

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