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The pressure and temperature dependences of the self-diffusion coefficients of the linear dimethylsiloxanes, containing from two to nine silicon atoms have been determined by the NMR spin-echo technique. Activation energies and volumes are presented as derived quantities; the constant-volume activation energy is estim…
The magnetic and optical anisotropies observed in oblique-incidence Permalloy films show anomalous behavior for incidence angles greater than 60° (grazing incidence). In particular, the easy axis and the direction of greatest optical absorption are parallel to the vapor beam for incidence angles greater than about 70°…
Films which possess rotatable anisotropy have been observed. In these films, the easy direction of magnetization can be selected by the application of a sufficiently large magnetic field. The temperature dependence of hysteresis and resistivity have been studied. Films have also been examined by electron diffraction c…
Etching experiments are described in which diamonds showing octahedral, cubic and dodecahedral faces are heated in air within the temperature range of 800°c to 1400°c. A change in the etch pit orientations of the characteristic etch pits for these faces has been found as the temperature of etching is raised. Etching w…
Summary The crystal structure of the clay mineral dickite (Al 2 Si 2 H 4 O 9 ) has been refined to a greater accuracy than that reported in an earlier analysis. Improved lattiçe parameters are: a 5·15±0·001, b 8·940±0·001, c 14·424 ± 0·002Å., β 96° 44′± 1′. The dickite structure shows several significant distortions f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLanthanum and Neodymium Salts of Trifluoroacetic AcidJohn E. RobertsCite this: J. Am. Chem. Soc. 1961, 83, 5, 1087–1088Publication Date (Print):March 1, 1961Publication History Published online1 May 2002Published inissue 1 March 1961https://pubs.acs.org/doi/10.1021/ja01466a0…
The dislocation model of a symmetric tilt boundary is modified to take into consideration the stress field of the cores of the dislocations. It is found that such modification enables discussion of many properties of high-angle tilt boundaries including porosity, strain energy, intergranular fracture, grain boundary s…
Magnetization measurements were made on iron, nickel, and their alloys in hydrostatic pressures up to 3000 atm and in fields up to 12 000 oe. The results of these room-temperature measurements, combined with Patrick's results on the pressure dependence of the Curie temperatures, indicate that σ0, the saturation moment…
Additions of NiO, CoO, MnO 2 , Fe 2 O 3 , and CuO promote the anatase‐rutile transformation and grain growth of TiO 2 . Additions of Na 2 O and WO 3 retard the transformation and have no effect on the grain growth. The addition of MoO 3 strongly promotes the grain growth but has only a slight effect on the phase trans…
Recent theories of the anisotropy and magnetostriction due to the presence of Co2+ in spinel ferrites are reviewed and new work on the effects of Fe2+ is presented. The effects of these ions are great because the orbital angular momentum is not fully quenched by the crystal field. In the case of Co2+, the orbital mome…
The crystal nucleation behavior of some normal alkane liquids—C16H34, C17H36, C18H38, C24H50, and C32H66—was investigated by the droplet technique. The relative undercoolings, 1—λ, (i.e., the actual undercooling in units of the absolute melting temperature) at which the crystal nucleation frequency in these liquids be…
Abstract It is demonstrated that the various procedures recommended in the literature for the determination of the crystalline fraction in polyethylene specimens by means of X‐ray diffraction lead to consistent results if certain errors made by some of the previous authors are avoided. A simple procedure which is not…
Knight shift measurements have recently been made on a series of compounds having the $\ensuremath{\beta}$-Wolfram structure ${\mathrm{V}}_{3}X$, namely ${\mathrm{V}}_{3}$As, ${\mathrm{V}}_{3}$Au, ${\mathrm{V}}_{3}$Ga, ${\mathrm{V}}_{3}$Ge, ${\mathrm{V}}_{3}$Pt, ${\mathrm{V}}_{3}$Sb, ${\mathrm{V}}_{3}$Si, and ${\mathr…
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