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sxy5306鐵桿木蟲 (著名寫手)
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[求助]
應(yīng)急——晶體結(jié)構(gòu)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(gè)Ln原子構(gòu)成的三角形通過頂角共用形成之字形鏈,之字形鏈排列構(gòu)成與蜂巢類相類似的空間結(jié)構(gòu)。據(jù)報(bào)道,當(dāng)Ln為Eu時(shí),可占據(jù)兩個(gè)位點(diǎn),此時(shí)Cs為對稱中心時(shí)。CaFe2O4與AR2O4 具有相同骨架結(jié)構(gòu),同屬正交晶系。AR2O4骨架由四個(gè)基本單元、共計(jì)28原子組成,屬于Pnmaand群。AR2O4的正交結(jié)構(gòu)包含兩個(gè)八面體、雙帽三角棱體的R2O4單元, A原子位于該骨架構(gòu)內(nèi)。根據(jù)Wyckoff 法則,所有等同原子占據(jù)4c位。A原子與8個(gè)氧原子相連,稀土元素占據(jù)兩種不同的對稱中心點(diǎn),分別與6與5個(gè)氧原子相連。Fig. 1給出了結(jié)構(gòu)是SrY2O4。 給出相應(yīng)的 圖,翻譯就非常容易了 |

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