Materials Literature
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The effect of nitrogen in the range of 80 to 240 ppm on the microstructure and properties of C-Mn shielded metal arc welds containing Ti and B has been studied. It was found that nitrogen interacted with both elements and, by a combination of solute and microstructural changes, affected mechanical properties in either…
The predicted active site of chorismate mutase of baker's yeast Saccharomyces cerevisiae has been studied by continuum electrostatics, molecular surface/volume calculations, and molecular modeling. Our study shows that despite being subject to an allosteric transition, the enzyme's active-site pocket neither decreased…
A commercially available, sintered silicon carbide was exposed to a temperature of 982°C for up to 50 h in a burner rig pressurized to 500 kPa. Synthetic sea salt added to the flame (5 ppm) resulted in the deposition of sodium sulfate and formation of a sodium magnesium silicate corrosion product. A 16% reduction in r…
For TGS crystals pure and admixtured with L-threonine, measurements of the permittivity ε and tg δ of the loss angle versus the measuring field frequency (varied from 1 to 104 kHz) were performed in the temperature range from 80 to 330 K. For the first time the low-frequency dielectric dispersion was observed in three…
The distribution of valence among the bonds in the bond graph of an inorganic compound is used to calculate an `entropy'. We show that the distribution of valence that maximizes this entropy (ME) is similar, but not identical, to that obtained using the equal-valence rule (EVR) proposed by Brown [ Acta Cryst . (1977),…
The magnetization and resistivity of single crystals of the ferromagnetic compound Sr14MnSb11 are measured as functions of magnetic field, temperature, and crystal orientation. The uniform magnetic susceptibility is used to identify TC=39 K. The ferromagnetic state is found to have a hard axis (c axis) anisotropy. The…
In this paper, the first application of ternary compounds of Mn-doped CuAlS 2 to a new red powder electroluminescent (PEL) phosphor has been reported. The chromaticity of the emission is a high-purity red very close to that of the red-CRT phosphor. The luminance–voltage ( L – V ), current–voltage ( I – V ), and lumina…
Marked changes of the main structural and magnetic properties of the RFe11Ti phases are induced by hydrogen insertion. High field magnetization measurements are reported on magnetically oriented ErFe11Ti and ErFe11TiH samples under a field up to 240 kOe (24 T) in the 4.2–300 K temperature range. A raise of the Curie t…
Three new molybdenum(VI) arsenate hydrates, Cs 2 Mo 2 O 5 As 2 O 7 ·H 2 O ( 1 ), Cs 2 Mo 2 O 5 (HAsO 4 ) 2 ·H 2 O ( 2 ), and Cs 4 Mo 6 O 18 (H 2 O)(HAsO 4 ) 2 ·2.5H 2 O ( 3 ), have been prepared and structurally characterized by single-crystal X-ray diffraction, thermal analysis, and IR spectroscopy. Crystal data: 1,…
The main concepts used to obtain high values of initial magnetic permeability in ferrimagnetic toroidal samples, are presented. Generally the main contribution to the permeability is due to the mechanism of domain wall bulging which is proportional to (M s2 / K) x D, where Ms is the saturation magnetization, K the mag…
An electron cyclotron resonance (ECR) plasma has been used in conjunction with solid metal targets for deposition of various metal and oxide compounds. A large microwave system provides dense and high-quality films at low gas pressures with a plasma generation independent on the sputtering process. The 2.45 GHz microw…
Terfenol-D, Tb1−xDyxFe2 (x≅0.7), is successfully used as a magnetostrictive transducer material for low-frequency applications. To extend the frequency range of magnetostrictive transducers into the high kHz and MHz range, new materials processing techniques must be developed to minimize eddy current losses. The metho…
LaCo 13 and La(Co, Fe)13 alloys have been prepared and studied as high temperature, high performance soft magnetic materials. The dc magnetic properties have been measured over a temperature range of 10–1273 K in fields of 0 to 5 T. Data obtained show that the dc magnetic properties (Hc,K1) of the La(Co, Fe)13 bulk al…
Phase-field systems as mathematical models for phase transitions have drawn a considerable attention in recent years. However, while they are suitable for capturing many of the experimentally observed phenomena, they are only of restricted value in modelling hysteresis effects occurring during phase transition process…
The chemical reactions between P 2 O 5 ‐ZnO‐H 2 O ultraphosphate glasses and water were characterized between room temperature and 500°C, using thermogravimetry, differential scanning calorimetry, X‐ray diffraction, and 31 P nuclear magnetic resonance. Water adsorption and hydrolysis reactions of the glass leads to th…
The structure of titania/zirconia colloids has been investigated using small-angle neutron scattering (SANS). The colloids were produced by: (i) hydrolysis of a mixture of titanium and zirconium alkoxides and peptization of the resulting hydrolyzate with nitric acid (homogeneous) and (ii) hydrolysis of a titanium alko…
The passivity and electrochemical behavior of single crystalline, ordered NiAl intermetallic compound in buffered solutions of pH 2, 7, and 12.5 was compared to that of polycrystalline Ni and Al. NiAl exhibited improved passivity compared to Ni at a pH of 2, and improved passivity compared to Al at pH 12.5. Water oxid…
We have investigated the influence of α-Fe content on the magnetic properties of (Sm, Zr)Fe7Nx+α-Fe nanocomposite permanent magnet materials. As α-Fe content increases, the saturation magnetization and the remanence increase while the coercivity decreases monotonously. Also we confirmed the influence of microstructure…
The DL- and L-arginine complexes of oxalic acid are made up of zwitterionic positively charged amino acid molecules and semi-oxalate ions. The dissimilar molecules aggregate into separate alternating layers in the former. The basic unit in the arginine layer is a centrosymmetric dimer, while the semi-oxalate ions form…
Abstract The direct‐esterification reaction of succinic acid (SA) with 1,4‐butanediol (BD) was investigated in the temperature range from 170°C to 190°C with and without a monobutyl tinoxide (MBTO) catalyst. The extent of reaction was measured by the quantity of water distilled from the reaction. The effects of reacti…