Materials Literature
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Magnetomechanical ratios for four Fe-Co alloys were measured by the Einstein-de Haas method. Previous measurements of Fe, Co, Ni, and Fe-Ni and Co-Ni alloys are reviewed, thus completing magnetomechanical determinations for the binary alloys of these three ferromagnetic elements. Magnetomechanical ratios for these bin…
The ultraviolet-absorption spectra of europium and ytterbium ions in Ca${\mathrm{F}}_{2}$ crystals have been measured at room and liquid-nitrogen temperatures. Their spectra are similar to each other in the general location of their absorption bands. Both spectra consist of: (i) $4f\ensuremath{\rightarrow}5d$ bands, b…
Shocked Bamle enstatite partly transforms to disordered enstatite. Debye-Scherrer patterns of some shocked material are almost identical to those of disordered enstatite from portions of various enstatite achondrites. No disorcdered single crystals have been found.
The recently characterized " white " allotropic form of carbon has been produced at high temperature and low pressure during graphite sublimation. Under free-vaporization conditions above approximately 2550 degrees K, the white carbon forms as small transparent crystals on the edges of the basal planes of graphite. Th…
Photoemission measurements on the magnetic semiconductors EuO, EuS, and EuSe show emission from $4{f}^{7}$ states which lie in the gap above the top of \ensuremath{\sim}2- to 3-eV-wide valence bands. These measurements, together with optical data, indicate semiconductor energy gaps of 4.3, 3.1, and 3.1 eV for EuO, EuS…
The results of measurements of the spin-lattice relaxation properties of mixed single crystals of chromium and aluminium acetylacetonate are reported. Measurements were made at microwave frequencies (9·3 GHz) in the range of liquid helium temperatures. In dilute crystals, where the investigation was primarily concerne…
EPR spectra differing in hyperfine splitting have been reported for Mn (II) ions in Ν,Ν-Dimethylformamide (DMF) when using Mn (ClO 4 ) 2 and MnCl 2 . The difference in the reported spectra is shown to be due to the species MnCl 4 2⊖ by a mole ratio plot. The presence of MnCl ⊕ is also indicated by a mole ratio plot. T…
The structure of interstitial solid solutions in zirconium-oxygen alloys over the composition range 15.0 to 28.5 at.% O has been studied using x-ray, neutron and electron diffraction techniques. The superstructure observed in alloys of 25.0 to 28.5 at.% O corresponds to that observed by H olmberg and D agerhamn . A di…
The electrical resistivity of irons containing different levels of impurity have been measured at 77° and 293°K for a range of grain sizes. The resistivity of a given iron is found to vary with the grain diameter (d mm) as ρ = A+B log(1/d). A and B are both temperature dependent, increasing with increasing temperature…
The magnetic domain structures formed at grain boundaries in recrystallized iron foils have been analyzed using Lorentz electron microscopy. Five basic types of domain structures have been observed at grain boundaries in iron: (1) Domain walls which penetrate through the boundary indicating ``no interaction,'' (2) dou…
Many kinds of partial discharge detectors are available, and many kinds of windings are adopted for EHV transformers, where propagation of partial discharge pulses is characterized mainly by series capacitance. The acoustic method is predominantly used for partial discharge location, because of the present scarcity of…
Abstract Studies were carried out on decomposition of hydrogen peroxide by ferrous and ferric ions adsorbed on cellulosic materials (SP, SCP), scission of the cellulose chain and formation of grafts by graft copolymerization. As a result, it was found that the activity of ferrous ion is always higher than that of ferr…
Cutting tools of sufficient strength against failure by brittle fracture or loss of “form stability” through rise of interface temperatures, still continue to fail by a process of “wear,” which is loss of cutting tool material through gradual interaction between the work and the tool material. Such wear can take place…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantum yields for the sensitized photoisomerization of cis- and trans-stilbeneHowell A. Hammond, D. E. DeMeyer, and Jack L. R. WilliamsCite this: J. Am. Chem. Soc. 1969, 91, 18, 5180–5181Publication Date (Print):August 1, 1969Publication History Published online1 May 2002Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of nitrenium ions. IX. Discrete existence of singlet and triplet nitrenium ionsPaul G. Gassman and Richard L. CrybergCite this: J. Am. Chem. Soc. 1969, 91, 18, 5176–5177Publication Date (Print):August 1, 1969Publication History Published online1 May 2002Published i…
Electron attachment to N2O has been studied with the swarm method in mixtures with argon and nitrogen, and the measured absolute attachment rates have been combined with beam data on the production of O− from N2O. The cross section for the production of O− from N2O at 373°K has a peak value of 8.3 × 10−18 cm2 at 2.3 e…
Deformation twinning can be inhibited in a Mg-5·1 wt. % Zn alloy by the presence of effective precipitates. This is true even in single crystals favourably oriented for twinning. This resistance to twinning precludes those premature fractures which frequently nucleate at twins. At 4·2°k twinning is highly favoured but…
Results of steam oxidation measurements of UO 2 cylinders from 885° to 1835°C may be expressed by the equations: image for the parabolic rate of oxidation and image for the chemical oxygen diffusion coefficient. K p and D c , obtained from thermobalance measurements to 1500° C and from pre‐ and post‐test weights for t…
An extensive study has been made on the growth and characterization of single-crystal magnesium aluminate spinel. This material has received attention as a superior substrate for epitaxial silicon-integrated electronic devices. Large spinel single crystals within the compositional range MgO:Al2O3–MgO:3Al2O3, have been…
A new method is described for examining the deformation dynamics of metals at elevated temperatures. Tensile loads are applied to a specimen using a closed loop electrohydraulic servosystem. An optical furnace and proportional controller are used for temperature control, and a linear variable differential transformer…