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Synthesis and crystul Structure of Lutetium Complex with Triethylenetetraaminehexaacetic Acid (H_6ttha):{[Lu_2 (ttha) (H_2O)_6Lu_2 (ttha) (H_2O)_4]·21H_2O}_n

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Journal of Rare Earths 1999年第4期17卷 250-254页

作者：马宝清高松金天柱王哲明严纯华徐光宪 State Key laboratory of Rare Earth Materials chemistry and Applications Peking University Beijing 100871 China

The title complex was synthesized in an aqueous solution and its crystal structure was determined by X-raydiffraction method. It crystalizes in triclinic crystal system, space group P1, formula C36H110N8O55Lu4, Mr=2235.2,a=1.09787(7) nm, b=1.27603(10) nm, c=1.45903(10) nm; α=75.769(6)°, β=85.288(5)°, γ=71.577(6)°, V=1.8797(2) nm3,Z=1, Dc= 1.975 g·cm-3, F(000)=1106, μ=5.312 mm-1; R1=0.0239, wR2=0.0527 for 7156 reflections with I>2σ (I). In the complex, the lutetium ion is coordinated by two nitrogen atoms andsix oxygen atoms and the coordination number is 8. Its coordination polyhedron can be described as a distorted squareantiprism. The complex is of an infinite chain structure. The complex was characterized by elemental analysis, IR spectra and thermal analysis.

关键词： Rare earths Lutetium complex Crystal structure Triethylenetetraaminehexaacetic acid

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Physical vapor transport growth and morphology of Bi2Se3 microcrystals

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Particuology 2016年第3期14卷 118-122页

作者： V.V. Atuchin S.V. Borisov T.A. Gavrilova K.A. Kokh N.V. Kuratieva N.V. Pervukhina laboratory of Optical Materials and Structures Institute of Semiconductor Physics SB RAS Novosibirsk 630090 Russia Functional Electronics laboratory Tomsk State University Tomsk 634050 Russia laboratory of Semiconductor and Dielectric Materials Novosibirsk State University Novosibirsk 630090 Russia laboratory of crystul chemistry Institute of Inorganic Chemistry SB RAS Novosibirsk 630090 Russia laboratory of Nanodiagnostics and Nanolithography Institute of Semiconductor Physics SB RAS Novosibirsk 630090 Russia laboratory of Crystal Growth Institute of Geology and Mineralogy SB RAS Novosibirsk 630090 Russia Geology and Mineralogy Department Novosibirsk State University Novosibirsk 630090 Russia Spintronics laboratory Saint Petersburg State University Saint Petersburg 198504 Russia laboratory of Research Methods of Composition and Structure of Functional Materials Novosibirsk State University Novosibirsk 630090 Russia

High-quality Bi2Se3 microcrystals were grown by the physical vapor transport （PVT） method without using a foreign transport agent. The microplate crystals grown under the optimal temperature gradient are well faceted and have dimensions up to -200 μm, The growth proceeds by the layer-by-layer mecha- nism with the formation of flat low-growth rate facets. The phase composition of the grown crystals was identified by the X-ray single crystal structure analysis in space group R3m, a = 4.1356（3）, C= 28.634（5）A, Z=3 （R=0.0147）. The most probable twin planes in the tetradymite structure were evaluated by the pseudo translational sublattice merhad.

关键词： Bi2Se3 Physical vapor transport Structure Twin

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