منابع مشابه
STRUCTURE AND EXCITATIONS OF ORTHORHOMBIC Al3Co
We study the energetics of quasicrystals using a lattice gas simulation to sample atomic conngurations close to the quasicrystal and its approximants. The total potential energy for each connguration is calculated by summing electronic structure based pair potentials. We apply this method to study Al 73 Co 24 in a 14.4 A by 12.3 A by 8.1 A orthorhombic cell. The structures obtained are compared...
متن کاملSTRUCTURE AND FORMATION OF TWINS IN THE ORTHORHOMBIC YBa2CuJ0,_x
Structure and formation of twins in the orthorhomhic phase of YBaQ@_, samples, exhibiting bulk superconductivity at 90 K, are studied by transmission electron microscopy and modeling. Twinned domains with { 110) twin boundaries form with separation I which is dictated by energetic and geometrical requirements. Both of these requirements are related to Aa= b-a, where b and a are lattice paramete...
متن کاملStructure Refinement of BaIrIn2
BaIrIn2 was synthesized from the elements in a sealed tantalum tube in an induction furnace. The indide was investigated by powder and single crystal X-ray data: Cmcm, a = 443.3(1), b = 1151.3(2), c = 806.0(1) pm, wR2 = 0.0471, 352 F2 values, and 16 variable parameters. The iridium and indium atoms build up two-dimensional [IrIn2]2− polyanions (279 – 281 pm Ir–In and 310 — 314 pm In–In) which a...
متن کاملStructure of the orthorhombic form of human inosine triphosphate pyrophosphatase.
The structure of human inosine triphosphate pyrophosphohydrolase (ITPA) has been determined using diffraction data to 1.6 A resolution. ITPA contributes to the accurate replication of DNA by cleansing cellular dNTP pools of mutagenic nucleotide purine analogs such as dITP or dXTP. A similar high-resolution unpublished structure has been deposited in the Protein Data Bank from a monoclinic and p...
متن کاملStructure Refinement of AuSn2
Well-shaped single crystals of binary AuSn2 were obtained as a side product during the synthesis of LiAu3Sn4. The structure of AuSn2 has been studied by X-ray diffractometer data: Pbca, Z = 8, a = 689.8(1), b = 701.1(1), c = 1177.3(2) pm, wR2 = 0.0533, 1234 F2 values, and 29 variables. The gold atoms show a distorted octahedral coordination by tin at Au–Sn distances ranging from 272 to 283 pm. ...
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ژورنال
عنوان ژورنال: Acta Crystallographica Section C Crystal Structure Communications
سال: 1995
ISSN: 0108-2701
DOI: 10.1107/s0108270194012965