Materials Literature
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The rate of growth and properties of the first layer of compact to form are important for elucidation of the oxidation reaction for niobium. It was found possible to maintain this oxide in contact with the metal for sufficient time in the temperature range 720°–825°C to make measurements of its growth rate at various…
Abstract The phenomena accompanying the flow of an electric current through uniaxially compressed plates of intrinsic Ge are investigated. The plates are cut with definite orientations relative to the main crystallographic axes so that the directions of the current and field do not coincide. Under these conditions tra…
V204～V206系平衡状態図のうち,V～V204系は多くの研究者によって詳細に研究されているが,V204～V205系については,完全な平衡状態図は完成されていな炉。そこで著者らは,X線解析と示差熱分析とを用いて,V204～V205系状態図を決定した.その結果,V204～V205の中間に,V8O13,V307の二相が存在し,それぞれ710°,680℃の包晶温度を持つことを確認した。またV307,V205は非常に狭い固溶領域を持つことがわかった。さらにV6O13,V307,V205の比抵抗と帯磁率を測定して比較検討した。新しい相V307は,-200°～+200℃の温膵範囲で,常磁性を示し,-200°～0℃の温度範囲で・他の相より大き…
{10\bar11} transformation twins, produced in the martensite of commercially pure titanium, have been investigated by means of transmission electron microscopy and discussed in relation to the character of the martensitic transformation. The results are as follows: (1) The twins have a thickness of 250∼3000 Å, and they…
Electron spin resonance (e.s.r.) spectra of dilute fluid and rigid aqueous solutions of [Cr(CN)5NO]3–, [Cr(NO)(NH3)5]2+, and [Cr(NO)(H2O)5]2+ have been measured. [Cr(NO)(H2O)5]2+ appears axially symmetric with g⊥ considerably larger than g∥; 53Cr and 14N hyperfine structure has been observed for this complex. In contr…
Potentiostatic methods have been used to investigate the kinetics of electrodeposition of NiOOH from buffered acetate solutions. The dependence of the rate constants governing crystal growth upon potential, pH, and Ni2+ ion concentration has been measured. The initial formation of a very thin oxide layer by three-dime…
A method and technical details are described for direct observation of effects of high amplitude ultrasonic stress waves on dislocations in metal crystals. The technique combines, for the first time, ultrasonic treatment at high acoustic energy densities (up to 109 ergs/cm3 at frequencies between 30 and 100 kc), obser…
Inter-fibre frictional forces, F, corresponding to normal loads, R, of up to 300 g, experimentally determined for a large number of fibres, mostly cottons, rayons, and polynosic rayons, conform to a general expression of the form F = αRn . The parameters α and n are, however, shown to be interdependent, correlations a…
Major characteristics of observed effects of uniaxial compression upon magnetization of rocks and assemblages of magnetic minerals are summarized as follows: -(a) uniaxial compression in a magnetic field results in a decrease of magnetization; (b) removal of the magnetic field in presence of the compession causes a de…
electrostatic forces. The repulsions terms amount to about 10-15% of the lattice energy and cannot be neglected. It should be pointed out the variation of the oxygen parameter has not been taken into account as has already been done by Verwey, de Boer & van Santen (1948), who already give the energy values for 1 and 2…
Abstract Specific heat studies of polymers are reviewed within the framework of Buyer's classification: ( a ) melting transition ( T m ); ( b ) glass transition ( T g ); ( c ) subglass relaxation ( T < T g ); and ( d ) intermediate relaxation ( T g < T < T m ). The melting transition is readily apparent in sp…
The α-chloro-, αγ-dichloro-, and αβγδ-tetrachloro-derivatives of octaethylporphyrin have been prepared by direct halogenation of the porphyrin. Chlorination of octaethylchlorin gives the corresponding γ-chloro- and γδ-dichloro-chlorins; dehydrogenation of the former with 2,3-dichloro-5,6-dicyanobenzoquinone leads to α…
R. G. J. Strens, Chem. Commun. (London), 1966, 519b DOI: 10.1039/C1966000519B
The passivation of a zinc electrode has been studied both by galvanostatic and potentiostatic methods in boric acid-sodium hydroxide buffer solutions. After addition of chloride ion, the characteristics of pitting corrosion have been investigated. The results indicate that pits form only on a passive surface and that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Spectrophotometric Study of the Nd3+-NO3- Association1Nathan A. Coward and Robert W. KiserCite this: J. Phys. Chem. 1966, 70, 1, 213–217Publication Date (Print):January 1, 1966Publication History Published online1 May 2002Published inissue 1 January 1966https://pubs.acs.or…
The inhibition of the corrosion of iron in alkaline solutions is due to the anodic formation of a film of a ferrous compound, which is usually ferrous hydroxide, but in the presence of anions yielding less soluble ferrous salts, e.g. carbonate, the composition may be mixed. The ferrous compounds are subsequently oxidi…
The crystal structure of silver nitrate has been elucidated from an X-ray analysis. The crystals are orthorhombic, a= 6·997, b= 7·325, c= 10·118 Å, z= 8, space group Pbca (D2h15). Silver atoms lie essentially in planes parallel to (010) and separated by b/2. These planes are linked by the symmetry-related nitrate grou…
Stress-fields around piled-up groups of dislocations of arbitrary orientation have been calculated by replacing the discrete dislocations by a continuous distribution of infinitesimal dislocations. Previous calculations by Mitchell (1964) have been performed on edge and screw dislocation pile-ups. In the present paper…
The degree of normal segregation, occurring during directional (normal) freezing in a transverse magnetic field of 34 000 oersteds, has been determined for aluminium–copper alloys solidified for rates of [Formula: see text] to 4 inches per hour. For ingots in the composition range 0.5% < %Cu < 4.5%, solidified a…
Liquid crystal mixtures were sandwiched between two transparent electrodes on glass and a direct or alternating potential was applied. The light scattering property of the liquid crystal changes upon application of voltage, the intensity varying from 1 to 10% of that scattered by a MgO diffuse surface. The maximum inc…