Decrease In Iron Content Research Articles

Magnetically induced anisotropy in amorphous alloys of Fe-Ni-P-B

The uniaxial magnetic anisotropy K <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">u</inf> induced during magnetic annealing has been determined for a series of amorphous alloys of the formula (Fe <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">y</inf> Ni <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1-y</inf> ) <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">80</inf> P <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">14</inf> B <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</inf> . In contrast to the (Fe, Ni) <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">80</inf> B <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">20</inf> amorphous alloys previously reported, K <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">u</inf> in the present alloys has neither the composition dependence nor the temperature dependence predicted from simple pair order theory. The results strongly suggest the presence of a large contribution to the directional order anisotropy from the metalloids in the iron-rich amorphous alloys. The dependence of the uniaxial induced anisotropy on decreasing iron concentration can be accounted for by a decreasing contribution from the metalloids. A discrepancy in the temperature dependence of K <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">u</inf> at high anneal temperatures is attributed to the experimental problem of too slow a quench from the anneal temperature, compared to the rather fast kinetics of equilibration at temperatures below the anneal temperature.

Depth Analysis of Passive Films on Iron in Neutral Borate Solution

Composition depth profiles of passive films on iron in a borate solution atpH 8.42 have been obtained by means of cathodic reduction combined with ellipsometry and chemical analysis. Results revealed that the compositional profile varied depending primarily on the potential and to some degree on the time of film growth. The barrier layer in contact with the metal changed in composition from an iron(II–III) mixed oxide at potentials below the Flade potential to an iron(III) oxide at more noble potentials. The deposit layer next to the solution was a hydrated iron(III) oxide and absorbed iron(II) ions at less noble potentials. There was found a peak or a decrease in iron concentration at the barrier/deposit boundary. The iron‐rich boundary was gradually replaced by the iron‐depleted as the potential was shifted to more noble direction. It was the barrier layer alone that increased in thickness during the film growth at potentials above the Flade potential. In the transpassive potential region the barrier layer ceased growing with potential and tended to contain a small concentration of iron(II) ions. It is suggested that the ion transport in the layers plays a role in determining the passive film composition.

Magnetic Kerr Rotation and Sublattice Iron Moment in Gd-Fe Amorphous Alloy Films

We investigated longitudinal Kerr loops vs composition on Gd-Fe alloy films and confirmed that Kerr rotation in these films was due mostly to the transition metal. The sublattice moment (from the saturation Kerr rotation angle) of iron in GdFe alloy films first increased slightly and suddenly decreased at 10 atomic% GdFe and finally decreased monotonically with decreasing iron content. The effect of this zigzag variation in the sublattice iron moment could be observed in the compositional dependence of the saturation magnetization.

Ferrokinetic studies in acute myocardial infarction

Serum iron levels were determined in 16 patients with AMI at different days following the event and in five patients either treated with steroids or suffering from diseases acting as stress factors. Patients with AMI showed a marked decrease in serum iron concentrations, the lowest value being recorded at day 3 after the event; serum iron returned to normal level at day 12. These alterations in iron concentration were not accompanied by changes in the 24 hour urine excretion of iron. On the other hand, a significant shortening of the half-time 59Fe plasma clearance and an early increase in 59Fe incorporation into the red blood cells were found immediately after the event. These values returned to normal in all but one patients, who had in addition polycythemia. In the five patients comprising the control group, serum iron, iron excretion in urine, and ferrokinetics were within the normal limits at all times. Since in AMI patients the 11-OHCS values were found to be significantly higher on the day following the infarction than on day 15 after the event, it is suggested that the decrease in iron concentration in these patients may be connected with changes in plasma 11-OHCS levels.

SPIN WAVE RESONANCE ON PdFe ALLOYS

SPIN WAVE RESONANCE ON PdFe ALLOYS

The iron content of the brain of rats with choreiform movements

2,2′,2″-tripyridine and 3-acetylpyridine, which produce symptoms very similar to chorea minor, significantly reduced the iron content in the brain of rats. Since both tremorine and lysergic acid diethylamide also decrease the iron content in the brain of rats, the question arises whether uncontrolled movements are generally followed by a decrease of iron content in the brain.

The Significance of Iron Turnover in the Control of Iron Absorption

Abstract Following acute blood loss, there is a 4- to 5-day lag before any demonstrable change in plasma iron kinetics. Then there is a shortened Fe59 T½ and transient fall in the plasma iron. Associated with this is a decrease in the intestinal content of iron and an increased absorption of iron. We suggest the iron content of the epithelial cell is important in the regulation of its ability to absorb iron. The intestinal iron content is in turn closely controlled by the plasma iron turnover.

U-Fe系合金の相変態と熱処理, (II)

The kinetics of isothermal transformation were studied with uranium alloys varying in iron content 0.51.0 _??_. Two modes of β-to-α transformation, nucleation-and-growth and martensitic transformations, are observed and Ms temperature is determined as a function of iron content. The Ms temperature increases with decreasing iron content, so the martensitic transformation, which produces coarse α-uranium grains, prevails in such alloys of lower content of iron. Nucleation and growth mode is found to be applicable to grain-refinement. And suitable grain-refinement is generally attained by isothermal transformation in the temperature region from 450°C to Ms temperature.

Effect of Impurities and Heat‐Treatment on Ductility of MgO

Stress‐strain curves were obtained in flexure and in tension on single crystals of MgO. A decrease in iron content and high‐temperature heating and rapid cooling caused a decrease in strength and increase in ductility. Heat‐treatment of previously deformed specimens increased their strength. The slip band structures resulting from deformation were brought out by chemical etching, and their significant features are discussed.

Effects of Iron Deficiency on Respiration of Sunflower Plants

1. Sunflower plants were grown in sand culture with nutrient solution. One group had iron salt as ferric citrate added to the nutrient solution; the other had no iron salt added. 2. The plants of the minus-iron treatment developed the typical chlorosis symptoms of iron deficiency; the controls were of normal color. 3. Respiration rate was depressed in the young chlorotic leaves of the iron deficient plants. 4- The chlorotic leaves of the iron-deficient plants contained only half as much iron as comparable leaves of control plants. No relocation of iron from older to younger leaves occurred in the iron deficient plants. In both the gradients were of decreasing iron content in going from the bottom to the top of the plants. 5. The iron contents of the leaves of a given plant of either treatment were found to be related to the ages of the leaves. The older contained more iron than the younger leaves.