نتایج جستجو برای: coupled be fe
تعداد نتایج: 4447841 فیلتر نتایج به سال:
We present a systematic study using density functional theory (DFT) and coupled cluster (CCSD(T)) computations with an aim of characterizing a non-heme ferric-superoxo complex [(TMC)Fe(O2)](2+) (TMC = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane) that was proposed to perform allylic C-H activation of cyclohexene (Lee, Y.-M. et al. J. Am. Chem. Soc.2010, 132, 10668). As such, we invest...
In Lake Matano, Indonesia, the world's largest known ferruginous basin, more than 50% of authigenic organic matter is degraded through methanogenesis, despite high abundances of Fe (hydr)oxides in the lake sediments. Biogenic CH₄ accumulates to high concentrations (up to 1.4 mmol L⁻¹) in the anoxic bottom waters, which contain a total of 7.4 × 10⁵ tons of CH₄. Profiles of dissolved inorganic ca...
in this paper, a nonlinear free vibration analysis of thin annular functionally graded (fg) plate integrated with two uniformly distributed actuator layers made of piezoelectric (pzt4) material on the top and bottom surfaces of the annular fg plate is presented based on kirchhoff plate theory. the material properties of the fgm core plate are assumed to be graded in the thickness direction acco...
In com plexes o f the type [(NC )2H gIIN C FeII(CN )5]4~ which are formed in aqueous mixtures of H g(C N )2 and [Fe(C N )6]4~ both metals are weakly coupled. Optical metal to metal charge transfer (M M CT) excitation from F e11 to Hg" leads to the reduction of Hg" to Hg" an the oxidation of [Fe(C N )6]4~ to [Fe(C N )6]3~. In the complex [(NC)5CoIH g IIC o I(CN )5]6" the metals are strongly coup...
The role of bulk antiferromagnetic spins on exchange bias was investigated in interface spin-flop coupled Fe/MnPd bilayers and Fe/MnPd/Fe/IrMn multilayers. Magnetic measurement of the bilayers showed that the exchange bias saturated at a uniquely large critical thickness, ∼300 Å, with a spin reorientation transition simultaneously observed. Field cooling of the multilayer, with parallel or anti...
The structural and magnetic properties of rare-earth nanocomposite magnets of a (Nd,Dy)(Fe,Co,Nb,B)5.5 single layer and a (Nd,Dy)(Fe,Co,Nb,B)5.5/α-Fe multilayer prepared by sputtering and heat treatment have been investigated. Incomplete exchange coupling behaviour is observed in the Ti-buffered NdDyFeCoNbB + 40 wt%Fe single layer magnet. After annealing, the laminated nanostructure consisting ...
Interfacial moments of an antiferromagnet are known for their prominent effects of induced coercivity enhancement and exchange bias in ferromagnetic-antiferromagnetic exchange-coupled systems. Here we report that the unpinned moments of an antiferromagnetic face-centered-cubic Mn layer can drive the magnetization of an adjacent Fe film perpendicular owing to a formation of intrinsic perpendicul...
Using linear response approach to the Mössbauer isomer shift, the calibration constant alpha((57)Fe) was obtained from high level ab initio calculations carried out for a representative set of iron compounds. The importance of the effects of relativity and electron correlation for an accurate description of the (57)Fe isomer shift is demonstrated on the basis of the Hartree-Fock, coupled cluste...
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