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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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Inert marker experiments have shown that the solid‐state reactions forming MgAl 2 O 4 and MgFe 2 O 4 occur by counterdiffusion of the Mg 2+ , Fe 3+ , and A1 3+ ions through the relatively rigid oxygen lattice of the spinel or ferrite. It is suggested that earlier claims that ZnAl 2 O 4 forms by diffusion of Zn 2+ and…
A study of the formation of cubic boron nitride shows that the alkali and alkaline earth metals and their nitrides are effective catalysts for converting hexagonal boron nitride into cubic. The pressure and temperature required varies with the catalyst, and a minimum of about 45 000 atm and 1500°C has been found to be…
Die ONSAGERsche Theorie der „statischen” dielektrischen Polarisation einer Dipolflüssigkeit wird auf die nematische Phase einer kristallinflüssigen Substanz übertragen, wobei die Anisotropie der molekularen Polarisierbarkeit, die Orientierung des permanenten Dipolmoments im Molekül und die nematische Fernordnung berüc…
The principal features of the experimental results of Blewitt et al. (1957) and of Suzuki and Barrett (1958) on deformation twinning in face-centred cubic metals are explained in terms of an extension of the ‘prismatic’ source mechanism of Cottrell and Bilby (1951). Suitable prismatic dislocation sources are thought t…
Results of luminescence studies on chelates of La3+, Sm3+, Eu3+, Gd3+, Tb3+, Dy3+, Tm3+, Yb3+, and Lu3+ are reported. It is shown that the intramolecular energy transfer efficiency is a sensitive function of the relative positions of the resonance energy levels of the ions and the metastable triplet states of the comp…