Materials Literature
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The crystal structures of Ag2Mo2O7(I) and Ag2W2O7(II) have been determined by single-crystal X-ray analysis. Both compounds crystallize in space group P, Z= 2, with for (I): a= 6.095(3), b= 7.501(3), c= 7.681(3)Å, α= 110.4(1), β= 93.3(1), γ= 113.5(1)°; and for (II): a = 6.033(3), b= 7.051 (3), c= 7.735(3)Å, α= 73.8(1)…
In a systematic study of galvanic corrosion of aluminum alloys the effects of the dissimilar metal, the solution composition, and area ratio have been evaluated using galvanic current and weight loss measurements. In 3.5 percent sodium chloride, galvanic corrosion rates of the aluminum alloys 1100, 2024, 2219, 6061, a…
any other treatment of the COMBABILITY of HUMAN HAIR has been developed. The required instrumentation, experimental procedure, and interpretation of the data are presented in detail. The method involves the continuous recording of the forces, which oppose the motion of a comb through a swatch of hair. The data thus pr…
The solubility of the three paraffins octacosane, dotriacontane and hexatriacontane in each of the two solvents pentane and heptane have been measured in the temperature interval 10–35°C. The results follow with high accuracy a relation of the form lnx2=ΔSd/R–ΔHd/RT. The values of the parameters ΔHd and ΔSd involved i…
Dityrosine was formed by the action of peracetic acid and sodium peroxide on soluble collagens. Dityrosine was also detected in native insoluble collagen, but only from old animals. Dityrosine was identified by amino acid analysis, fluorescence absorption and mass spectra.
The crystal structure of cubic CsPbCl 3 was reinvestigated by neutron diffraction technique at 55°C. Two structure models were examined: (i) perovskite structure with anisotropic thermal vibration and (ii) disordered structure having several potential minima for the Cs and Cl atoms, originally proposed by Møller (1959…
The six dicyano-derivatives of 4-diethylaminoazobenzene in which the cyano-groups and the amino-group occupy different rings have been prepared, mostly by diazotisation of the appropriate dicyanoaniline, followed by coupling to NN-diethylaniline. The 2′,4′- and 2′,6′-dicyano-compounds were prepared more conveniently b…
Structural changes in ball-bearing steels caused by rolling contact fatigue have been studied. Attention is focused on changes that occur in the various carbide constituents. Large spherical primary cementite particles gradually break up and disappear during the fatigue process. At the same time, fine carbide constitu…
A survey of calcium phosphate precipitation in the neutral and slightly acidic pH range is presented. The concentration regions, within which precipitates are formed by direct crystallization and via precursor phases are defined. As examples, the kinetics of the precipitation and growth of calcium monohydrogen phospha…
Ceramic capacitors with ferroelectric dielectrics are the oldest application of ferroelectrics. The materials problem to be discussed is ferroelectric in nature; it is essentially the problem of dielectric saturation, i.e., the strong decreases of the dielectric constant with DC-fields. With todays more stringent volt…
The polarisation resistance method is extensively used for corrosion rate measurement. This paper considers the theoretical conditions which must be satisfied in the measurement of polarisation resistance and the limitations of the applicability of the method in relation to the properties of the electrolyte, the kinet…
The relations of neighboring Mn atoms, Mn–Mn interatomic distances and valence electron numbers to their magnetic moments and magnetic transformation temperatures in Clb-type Mn base compounds have been investigated.The magnetic interaction of these Clb-type compounds is probably dependent upon the type of neighboring…
The object of this study is to investigate precipitation behavior during aging of age-hardenable Fe–Ni–Mn martensitic alloys by means of specific heat measurement, thermal differential analysis, electron microscopic observation, and X-ray and electron diffractions. The as-quenched structure before aging is lath marten…
The effects of 150–300-keV He+ and H+ implantation in vitreous silica have been examined by optical absorption spectroscopy, optical and scanning electron microscopy, gas reemission measurements, and microtopography. No surface blistering or exfoliation was observed at any implant temperature (≲200° to ∠800 °C), at fl…
Abstract As 4 S 4 (II) wird durch Zusammenschmelzen von elementarem As und S im Atomverhältnis 1:1 bei 500–600°C und schnelle Abkühlung erhalten. Aus der Lösung in CS 2 rekristallisieren gelb‐orangefarbene Einkristalle in Form von sehr dünnen Plättchen. Die Kristallparameter sind a = 11,193, b = 9,994, c = 7,153 Å, β…
N.m.r. spectroscopy is used to demonstrate that the predominant interaction in aggregations of magnesium(II) porphyrins [e.g.(1)] involves the metal atom in one molecule and the propionate carbonyl group in another; in contradistinction, the similarly strong aggregation observed for the first time in zinc(II) porphyri…
The areal detection efficiency of a channel electron multiplier array (CEMA) and the nature of its secondary emission surface were investigated with the ion microprobe mass analyzer (IMMA). Previous speculations of detection efficiency based on simple geometric arguments of channel-to-interchannel area ratios are show…
The equilibrium vapour pressure of barium carbonate and the vacuum decomposition rates of the (001) face of its single crystal were measured by torsion–effusion and torsion–Langmuir techniques, respectively. The rate of the free surface decomposition reaction was constant for product layers up to about 1 mm thickness.…
G. M. Clark and R. Morley, Chem. Soc. Rev., 1976, 5, 269 DOI: 10.1039/CS9760500269
M. C. R. Symons, Chem. Soc. Rev., 1976, 5, 337 DOI: 10.1039/CS9760500337