Materials Literature
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Abstract The potential energy of polyethylene, polytetrafluoroethylene, polyoxymethylene, polyisobutylene, polyvinylidene chloride, and isotactic polypropylene with a helical conformation has been calculated as a function of the angles of rotation around the bonds of the backbone chain. The use of appropriate function…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of Discrete Eight-Coördination. II. The Crystal and Molecular Structure of Zirconium(IV) AcetylacetonateJ. V. Silverton and J. L. HoardCite this: Inorg. Chem. 1963, 2, 2, 243–249Publication Date (Print):April 1, 1963Publication History Published online1 May 2…
Barium ferrite platelet-shaped particles have been prepared with a diameter of 0.1 microns, which is an order of magnitude smaller than those obtained by conventional sintering and regrinding techniques. The preparation technique used has been optimized to produce the complete ferrite with σs=68 emu/g. Due to the smal…
The general analysis of uniformly moving dislocations in anisotropic media is applied to investigate the dynamical behavior of dislocations in the primary slip systems of body-centered cubic crystals. Both edge and screw dislocations on the {110}, {112}, and {123} slip planes are considered; in each case, the Burgers…
Magnetic measurements on a single crystal of MnP indicate strong ferromagnetic interactions at room temperature and cast doubt on previous ferrimagnetic or canted spin models. A new first-order transformation has been observed at 50°K below which MnP is metamagnetic, i.e., it exhibits a ferromagnetic-antiferromagnetic…
Ohm's law in strongly magnetic, though not necessarily ferromagnetic materials, has leading terms in the presence of a magnetization M and an induction B of the form E=ρJ−R0J×B−R1J×M+Δρ/M2(J·M)M+…,which represent the ordinary and extraordinary Hall effects and a magnetoresistance. The M-dependent terms, in particular,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE HEATS OF FORMATION OF TANTALUM CARBIDES1Elmer J. Huber Jr., Earl L. Head, Charles E. Holley Jr., and Allen L. BowmanCite this: J. Phys. Chem. 1963, 67, 4, 793–796Publication Date (Print):April 1, 1963Publication History Published online1 May 2002Published inissue 1 April…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Properties of N,N-Difluorohydroyxlamine-O-fluorosulfonate, NF2OSO2FMax Lustig and George H. CadyCite this: Inorg. Chem. 1963, 2, 2, 388–390Publication Date (Print):April 1, 1963Publication History Published online1 May 2002Published inissue 1 April 1963https:…
The isothermal galvanomagnetic behavior of an isotropic conductor in a magnetic field can be described by the vector equation E=ρ⊥j+n(j·n) (ρ∥−ρ⊥)+ρH(n×j),relating the electric field E to the current density j. The resistivities ρ∥ and ρ⊥ are those which result when the magnetic induction is parallel to j, and normal…
A discussion of the various physical processes relevant to the ionization of solid particles is given. Detailed considerations of the rates of thermionic and photoelectric emission from charged particles, electron attachment and recombination with charged particles and energy exchange in these processes are presented.…
The elastic moduli of pyrolytic graphite, a polycrystalline material exhibiting large elastic anisotropy, have been measured by the ultrasonic pulse-echo method. In units of 1011 dyn/cm2, they are c11 = 5.21, c12 = 1.88, c13 = 1.80, c33 = 2.58, and c44 = 0.15.
The viscosity of liquid water between −10° and +150°C (Psat=4.7 atm) is expressed by the equation: η=A exp[B/ (T−T0)], in which A = 290 μp, B = 510°, and T0 = 150°K. The true temperature-independent activation energy for viscous flow is E = RB = 1020 cal/mole. The ``free volume'' representation uses the equation η=A e…
The systems NixFe1−xCr2O4, CuxNi1−xCr2O4, and CuxCo1−xCr2O4 have been prepared and their crystallographic properties studied. From consideration of Jahn-Teller effects, it was shown that A-site Cu2+ is more effective than A-site Fe2+ in stabilizing a tetragonal (c/a<1) distortion at A-site Ni2+. In addition con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA THERMODYNAMIC STUDY OF THE THORIUM—OXYGEN SYSTEM AT HIGH TEMPERATURES1R. J. Ackermann, E. G. Rauh, R. J. Thorn, and M. C. CannonCite this: J. Phys. Chem. 1963, 67, 4, 762–769Publication Date (Print):April 1, 1963Publication History Published online1 May 2002Published iniss…
The problem considered is the interpretation of the tensile properties of twisted continuous-filament yams in terms of their geometrical structure and the properties of the constituent filaments. The theory developed for this purpose has the following principal features. (1) It is a large-strain theory, (2) Constancy…
A theory of the high temperature lattice thermal conductivity of semiconducting alloys is described in which normal processes are taken into account by the use of Callaway's method. This theory is in good agreement with data on germanium-silicon alloys, published recently by Abeles et al. , but it is shown that the th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTridentate Chelate Compounds. IIIJohn F. Geldard and Francis LionsCite this: Inorg. Chem. 1963, 2, 2, 270–282Publication Date (Print):April 1, 1963Publication History Published online1 May 2002Published inissue 1 April 1963https://pubs.acs.org/doi/10.1021/ic50006a008https://…
The saturation magnetostrictive constants of a magnetic material may be determined by means of ordinary ferromagnetic resonance. For small strains, the magnetic field required for resonance at a given frequency is a linear function of the applied uniaxial stress. The magnitude of this shift may be directly related to…
A powder neutron diffraction study of stoichiometric NiS has been made in the range 85–770°K. The NiAs-type structure can be obtained at room temperature by quenching from above 700°K. This NiAs form exhibits a paramagnetic-antiferromagnetic transition at 263°K. In the antiferromagnetic state the moments in a hexagona…
Pleochroism of the infrared absorption of muscovite has been measured under moderate resolution. The results are discussed in terms of the idealized mica structure. From the pleochroism of the OH stretching band, orientation of the vibrational transition moments can be determined. These moments are tilted out of the c…