نتایج جستجو برای: grain fe
تعداد نتایج: 138635 فیلتر نتایج به سال:
Sulfurized BiFeO3 (BFO) thin films have been investigated with the purpose of reducing their band gap for photovoltaic applications. A strong dependence of the degree of sulfurization on the structure and optical properties of the BFO thin films was observed. The sulfurization process substantially reduced the optical band gap from 2.83 eV for the reference sample to ∼1.90 eV in a sample sulfur...
Silicon in metallic form – dissolved in Fe-Ni metal, as silicide, or as Si 0 – is rare in solar system materials because its formation requires extremely reducing temperatures or oxidation states or both. Fe-Ni metal in carbonaceous chondrites can contain small proportions of Si [1], as does metal in shocked enstatite chondrites and aubrites [2]. Iron silicides are known from ureilite meteorite...
Nanomechanical characterization of thin FeXN ~X5Ta, Ti! films deposited by cosputtering from Fe, Ta and Ti targets on a Si/SiO2 substrate has been conducted using a nanoindenter. To fully understand the influence of the substrate on the measurement of film properties a continuous measure of the hardness and modulus as a function of depth was performed. The hardness of both FeTa and FeTi films w...
Manganese ferrite (MnFe2O4) has been successfully synthesized by using coprecipitation methods with a various particles size of 13.1, 13.8, 16.2, 18.1, and 18.4 nm. Analysis of crystal structure properties which has been carried out by using XRD (X-Ray Diffraction) method revealed that all samples belong to cubic spinel structure. The measurement used computerized impedance spectroscopy system ...
Iron deficiency is a worldwide nutritional constraint in agricultural lands especially in calcareous soils. Cultivation of crops tolerant to Fe-deficiency is an approach to combat Fe deficiency. The aim of this investigation was to evaluate Fe-efficiency of selected important crops in Iran. A completely randomized block design in triplicates was conducted at IUT research greenhouse in fall 2006...
Production of Fe-C alloy powders by mechanical alloying was studied. Fe and graphite elemental powder mixtures containing 0.8 and 1.5wt.% graphite were mechanically alloyed using a planetary ball mill. The structural changes of powder particles during mechanical alloying were studied by x-ray diffractometery, scanning electron microscopy and microhardness measurements. For both compositions, me...
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