We report the local electronic and magnetic properties of Bi(2)FeCrO(6) nanostructures by element-specific polarized x-ray techniques. Sizable magnetic ordering in the remanent state is observed at room temperature for both Fe and Cr ions. The Bi(2)FeCrO(6) system offers an example of d(5)-d(3) magnetic superexchange interaction with a magnetic order for both Fe and Cr, which are both formally ...

We present an analysis of the carbon dwarf G77-61, a known binary, based on high resolution Keck spectra. G77-61 has a very-low metallicity, although not as extreme as what was previously conjectured. This star is very carbon-enhanced, the spectra showing very strong CH, CN, and C2 bands of both 13C and 12C isotopes. Atomic lines are sparse, and often blended, but we were able to derive abundan...

We have studied the magnetoresistance of (001)Fe/(001)Cr superlattices prepared by molecularbeam epitaxy. A huge magnetoresistance is found in superlattices with thin Cr layers: For example, with rc, =9 A, at T =4.2 K, the resistivity is lowered by almost a factor of 2 in a magnetic field of 2 T. We ascribe this giant magnetoresistance to spin-dependent transmission of the conduction electrons ...

Stellar parameters of 25 planet-hosting stars and abundances Li, C, O, Na, Mg, Al, S, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Ni, Zn, Y, Zr, Ba, Ce, Pr, Nd, Sm Eu, were studied based on homogeneous high resolution spectra uniform techniques. The iron abundance [Fe/H] key elements (Li, Si) indicative the planet formation, as well dependencies [El/Fe] $T_{cond}$, analyzed. determined in our sample with de...

Cr stable isotope measurements can provide improved estimates of the extent of Cr(VI) reduction to less toxic Cr(III). The relationship between observed (53)Cr/(52)Cr ratio shifts and the extent of reduction can be calibrated by determining the isotopic fractionation factor for relevant reactions. Permeable reactive barriers (PRB) made of Fe(0) and in situ redox manipulation (ISRM) zones effect...

Compositional fields for spinels from a wide variety of mafic– a wide range of conditions from mafic and ultramafic ultramafic igneous rock types and tectonic environments have been magmas and, in the case of chromites, are often among determined from a global database of over 26 000 analyses. the first phases to crystallize. They also exhibit a wide These fields are defined using contoured dat...

Nuclear resonant inelastic x-ray scattering spectra were measured for Fe in disordered body-centered-cubic alloys of Fe-Cr. Partial phonon density of states DOS curves were obtained from these data. These results, in conjunction with the results of Ruckert et al. Hyperfine Interact. 126, 363 2000 on Fe-Cr thin-film multilayers and alloys, were analyzed with a local-order cluster expansion metho...

A Co-based alloy coating was deposited on H13 steel substrate via pulsed Nd:YAG laser and the corrosion resistance to mechanism of in molten aluminum were explored. The results showed that mainly composed ?-Co dendrite M23C6 precipitation. average hardness cladding layer 732.6 HV0.5, which 3.55 times greater than substrate. During test, surface immersed for 4, 8, 16 24 h at 700 °C. rate decreas...

This study assessed heavy metals (Lead (Pb), Nickel (Ni), Iron (Fe), Chromium (Cr), and Cadmium (Cd)) concentration in water (from borehole, hand-dug well the sea) fish (Cynoscion regalis Pomatomus saltatrix species) possible health risk exposure by consumption of these fishes. A total 18 samples two species (C. P. saltatrix) were collected from Jomoro, Ellembelle Ahanta West District analyzed ...