We report that the (Ba,K)Fe(2)As(2) superconductor (transition temperature, T(c) approximately 38 K) has an inverse iron isotope coefficient alpha(Fe) = -0.18(3) (where T(c) approximately M(-alphaFe) and M is the iron isotope mass); i.e., the sample containing the large iron isotope mass depicts a higher T(c). Systematic inverse shifts in T(c) were clearly observed between the samples using thr...

Earth's core may contain C, and it has been suggested that C in the core could stabilize the formation of a solid inner core composed of Fe 3 C. We experimentally examined the Fe-C system at a pressure of 5 GPa and determined the Fe-C phase diagram at this pressure. In addition, we measured solid metal/liquid metal partition coefficients for 17 trace elements and examined the partitioning behav...

The title compound, [Fe(2)(C(14)H(10)NS(2))(2)(CO)(6)], was synthesized as a structural and biochemical model for the active site of [FeFe]-hydrogenase. The bond lengths (Fe-Fe, Fe-S and Fe-C) and angles (C-Fe-Fe and Fe-S-Fe) are within expected ranges. The S⋯S distance [2.9069 (12) Å] and the dihedral angle between two Fe-S-Fe planes [78.5 (3)°] of the butterfly-shaped Fe(2)S(2) core are enlar...

Density functional theory calculations were performed to study the structure and magnetic properties of bcc (α) and fcc (γ) Fe with 3 at.% carbon and manganese impurities. We find that all bcc-based Fe, Fe-C and Fe-Mn-C phases exhibit a ferromagnetic (FM) ground state, while the antiferromagnetic double-layer (AFMD) state is lowest in energy within the collinear spin approach in fcc Fe, Fe-C an...

The gas-phase reactions of Fe(CH2O) and Fe(CH2S) with a series of aliphatic alkanes were studied by Fourier transform ion cyclotron resonance (FTICR) mass spectrometry. Like bare Fe+, C-C insertion, particularly terminal C-C insertion, is predominant for the reactions of Fe(CH2O), while C-H insertion is preferred for Fe(CH2S). About 90% of the Fe(CH2O) reaction products are formed by C-C insert...

The title compound, [Fe(2)(C(9)H(11)NS(2)){Fe(C(5)H(5))(C(17)H(14)P)}(CO)(5)], was prepared as an aza-dithiol-ato-iron model for the iron-only hydrogenase active site. The Fe(2)S(2) unit exhibits a butterfly conformation and the ferrocenyldiphenyl-phosphine ligand is trans to the Fe-Fe bond. The Fe-Fe distance of 2.5160 (8) Å is longer than found in related model structures. Intra-molecular C-H...

Effects of ultra high magnetic field of both pulse and steady types on martensitic transformation have been studied, using Fe-Ni-Mn, Fe-Ni-Mn-C alloys with the supplemental tests on Fe-Ni-C and Fe-NiCo-Ti alloys. It is found that the martensitic transformation is induced at room temperature not only athermally but also isothermally either by pulse magnetic field or by steady magnetic field for ...

Typical high-temperature recycling processes for precious metals use molten metal as a collector to concentrate the metals. The purpose of this study is compare performance and investigate feasibility selective recovery Using two liquid phases separation ternary alloy system, Rh, Pd, Pt, Au were added Fe-Cu-C, Fe-Pb-C, or Fe-Ag-C systems at 1500 K Ni-Ag-C system 1700 under carbon saturation, di...

The highly unsaturated binuclear butadiene iron carbonyls (C(4)H(6))(2)Fe(2)(CO)(n) (n = 2, 1) have been examined using density functional theory. For (C(4)H(6))(2)Fe(2)(CO)(n) (n = 2, 1), both coaxial and perpendicular structures are found. The global minima of (C(4)H(6))(2)Fe(2)(CO)(n) (n = 2, 1) are the perpendicular structures 2Q-1 and 1Q-1, respectively, with 17- and 15-electron configurat...