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sxy5306鐵桿木蟲 (著名寫手)
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[求助]
應急——晶體結構翻譯!
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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. [ Last edited by sxy5306 on 2010-11-2 at 08:41 ] |
木蟲 (正式寫手)

木蟲 (職業(yè)作家)
木蟲 (正式寫手)
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在SrLn2O4 (Ln = Gd, Dy–Yb)型化合物骨架中,3個Ln原子構成的三角形通過頂角共用形成之字形鏈,之字形鏈排列構成與蜂巢類相類似的空間結構。據報道,當Ln為Eu時,可占據兩個位點,此時Cs為對稱中心時。CaFe2O4與AR2O4 具有相同骨架結構,同屬正交晶系。AR2O4骨架由四個基本單元、共計28原子組成,屬于Pnmaand群。AR2O4的正交結構包含兩個八面體、雙帽三角棱體的R2O4單元, A原子位于該骨架構內。根據Wyckoff 法則,所有等同原子占據4c位。A原子與8個氧原子相連,稀土元素占據兩種不同的對稱中心點,分別與6與5個氧原子相連。Fig. 1給出了結構是SrY2O4。 給出相應的 圖,翻譯就非常容易了 |

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