where a = ~H/kBT, kB i~ Boltzmann's constant, T is te~­ perature, and ~ is def1ned as before. The total stat1c structure factor S(QL,QR,a) is therefore the single nilrticle structllre factor, \~eighted by th" angular dis­ tribution function, integrated over all angles: S(QL,QR,a) = Nf p(~,a) Ssp(QL,QR,~) d~ (3) Light scattering was used to determine both ~he. average length8 and magnetic moment...

Composite thin films prepared by sputter CO-deposition of Fe304 with small additions of Ag were investigated in this feasibility study. These nanocomposites possess unique magnetic properties which may be controlled by compositional variations. Atom probe field-ion microscopy was used to investigate the microstructure and microchemistry of the material. Field-ion microscopy in hydrogen was foun...

The mechanism of the structural transformation in Fe304 during its Verwey transition at 120 K is not completely understood, partly due to the lack of knowledge of the details of the local structure around different Fe atoms in the unit cell. In our experiment, this information was obtained at room temperature using Diffraction Anomalous Fine Structure (DAFS) technique which has the ability to s...

The magnetization of fresh natrocarbonatite lavas from Oldoinyo Lengai in Tanzania is dominated by small amounts of singleor pseudo-single-domain grains of a spinel in the solid solution series jacobsite (MnFe204)-magnetite (Fe304). Although this phase may acquire TRM before carbonatite lava crust has ceased being mobile, the Oldoinyo Lengai samples are good palaeomagnetic recorders of the fiel...

This paper considers the application of surface-analytical techniques to characterize both thin (-2 nm) passive oxide films and thick (up to 1 pm) oxides formed on metals and alloys a t high temperature. Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), Mossbauer spectroscopy, X-ray absorption near edge spectroscopy (XANES), secondary ion mass spectrometry (SIMS) and el...

Magnetospirillum sp. AMB-l is a freshwater magnetic bacterium which synthesizes intracellular particles of magnetite (Fe304). A genomic DNA fragment required for synthesis of magnetic particles, was previously isolated from a non-magnetic transposon Tn5 mutant. We have determined the complete nucleotide sequence of this fragment. The 2975 bp region contains two putative open reading frames (ORF...

Modeling of the PV-thermal solar collector and thermal storage PCM using magnetized nanofluids to power multi-stage flashing chambers desalinate seawater has been presented. The proposed model was established after mass energy conservation equations were written for finite control volume with properties heat transport fluid. studied presented hereby are Ai2O3, CuO, Fe304, SiO2. At different mag...

The heterogeneous reaction CO + O + COZ on water ice and various inorganic oxide (Si02, A1203, Fe203, Fe304, CaO, MgO, and Ti02) surfaces has been investigated in order to evaluate the proposition that this heterogeneous reaction may contribute to the COZ stability in the Martian atmosphere. The reaction probabilities were measured at both 196 K and 294 K by using a fast flow-tube reactor coupl...

In this research, the Magnetite nanoparticles (Fe304) were prepared by coprecipitation of Fe- andGinger is a well known spice and flavoring agent which has also been used in traditional medicine inmany countries. Ginger contains essential oils including gingerol and zingiberene. It also containspungent principles such as zingerone, and shogaol. In the paper six theoretical methods were used toc...

Super paramagnetic particles is a new class of magnetic materials that exhibit a susceptibility g near the value of one while most of natural paramagnetic materials have a magnetic susceptibility at least five orders of magnitude lower. Ferrofluid emulsion is one of such systems. A collection of iron oxide nanopanicles (in our case Fe304 with a radius of 6nm) dispersed When the volume fraction ...