Listar Ciencias Exactas y Naturales por tema "Estrutura cristalina"
Mostrando ítems 1-14 de 14
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Critical behavior of self-assembled rigid rods on two-dimensional lattices : Bethe-Peierls approximation and Monte Carlo simulations
(2013) [Artículo de periódico]The critical behavior of adsorbed monomers that reversibly polymerize into linear chains with restricted orientations relative to the substrate has been studied. In the model considered here, which is known as self-assembled ... -
Crystal structure and absolute configuration of (3aR,30aR,7aS,70aS)-2,2,20,20-tetramethyl- 3a,6,7,7a,30a,60,70,70a-octahydro-4,40-bi[1,3- benzodioxolyl], obtained from a Pd-catalyzed homocoupling reaction
(2017) [Artículo de periódico]The absolute configuration, i.e. (3aR,30aR,7aS,70aS), of the title compound, C18H26O4, synthesized via a palladium-catalyzed homocoupling reaction, was determined on the basis of the synthetic pathway and was confirmed by ... -
Crystal structure of 4-methyl-N-{(E)- methyl[(3aR,8aS)-2-oxo-3,3a,8,8a-tetrahydro- 2H-indeno[1,2-d][1,3]oxazol-3- yl]-λ4-sulfanylidene}benzenesulfonamide
(2015) [Artículo de periódico]The formulation that the title compound, C18H18N2O4S2, adopts is a zwitterionic core with the charge separated to the sulfilimine S and N atoms and is supported by the two different S—N bond distances about the sulfinimine ... -
Crystal structure of (4R,5S)-4-methyl-3-methylsulfinyl-5-phenyl-1,3-oxazolidin-2-one
(2014) [Artículo de periódico]The absolute structure of the chiral asymmetric indole precursor title compound, C11H13NO3S, was confirmed by refinement of the Flack and Hooft parameters and is that expected based on the starting materials for the ... -
Crystal structure of 5-O-benzoyl-2,3-O-isopropylidene- D-ribono-1,4-lactone
(2017) [Artículo de periódico]In the title compound, C15H16O6, obtained from the acylation reaction between 2,3-O-isopropylidene-d-ribono-1,4-lactone and benzoyl chloride, the known absolute configuration for the lactone moiety of the ester substituent ... -
Effect of composition and short-range order on the magnetic moments of Fe in Fe/sub 1-x/V/sub x/ alloys
(2000) [Artículo de periódico]We report dc magnetization, Mössbauer spectroscopy, and x-ray-diffraction measurements on Fe₁₋xVx alloys, quenched or heat treated, with single phase bcc structure in the whole concetration range. It is well known that the ... -
Electronic and crystallographic structure, hard x-ray photoemission, and mechanical and transport properties of the half-metallic Heusler compound Co2MnGe
(2011) [Artículo de periódico]This work reports on the electronic and crystalline structure and the mechanical, magnetic, and transport properties of the polycrystalline Heusler compound Co2MnGe. The crystalline structure was examined in detail by ... -
Environment of hafnium and silicon in Hf-based dielectric films : an atomistic study by x-ray absorption spectroscopy and x-ray diffraction
(2005) [Artículo de periódico]The atomic structure of HfSiO and HfSiON was investigated before and after thermal annealing using x-ray diffraction and x-ray absorption spectroscopy. In HfSiO, the Hf atoms are arranged in a monoclinic HfO2 structure ... -
Generic model of the colossal magnetoresistance pyrochlore Tl/sub 2/Mn/sub 2/O/sub 7/
(2002) [Artículo de periódico]The colossal magnetoresistance (CMR) exhibited by the pyrochlore compound Tl₂Mn₂O₇ was discovered in 1996. Important differences with CMR Mn-perovskite compounds regarding crystal structure and electronic properties were ... -
Low-dimensional magnetic properties of orthorhombic MnV2O6 : a nonstandard structure stabilized at high pressure
(2017) [Artículo de periódico] -
Magnetic and structural properties of ion nitrided stainless steel
(2009) [Artículo de periódico]The magnetic properties and crystalline structure of expanded austenite obtained by ion beam nitriding of AISI 316 steel are investigated. Magnetic force microscopy reveals that the nitrogen expanded austenite has two ... -
A new approach for the determination of multiple cation locations and ordering, using the example of natural and heat-treated columbites
(2011) [Artículo de periódico]A new approach is proposed to determine unambiguously the location of four cations within the crystal structure of a natural AB2O6 columbite-type compound and derivatives, when submitted to order–disorder transitions caused ... -
Peculiarity of a magnetic structure in a quasi-one-dimensional columbite Co0.4Ni0.6Nb2O6
(2020) [Artículo de periódico]Quasi-one-dimensional (Q1D) spin chain systems have great potential applications in high-density information storage devices, quantum information and computers, because of their quantum magnetism properties. The low-dimensional ... -
Suppression of magnetic ordering in quasi-one-dimensional FexCo1−xNb2O6 compounds
(2011) [Artículo de periódico]We present a systematic investigation of the series of compounds FexCo1−xNb2O6 by means of x-ray and neutron powder diffraction combined with magnetic measurements, carried out in the paramagnetic as well as in the ordered ...