Materials Literature
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An electron microscopic investigation is described of the effect of high temperature annealing on deformed copper single crystals containing dispersed second phases of either cobalt or silica. Sections of selected orientation cut from the deformed crystals were annealed at 700°C. It was found that specimens deformed i…
We discuss the value of the intrinsic magnetic moment of cobalt in intermetallic compounds of the formula RxCov, where R is a rare earth element or yttrium. The experimental values of this moment are determined from the results of neutron-diffraction studies and those of measurements of the absolute saturation magneti…
The magnetic susceptibility χ of UO2 diluted by its diamagnetic isomorph, ThO2, is reported for 1.7° ≤ T ≤ 60°K. In dilute samples, 5%–10% UO2 in ThO2, χ−1 decreases monotonically with decreasing temperature. Blume's singlet ground-state mechanism for the first-order magnetic phase transition in UO2 requires a Γ1 sing…
Spinels CoCr2O4 and MnCr2O4 display a magnetic structure in which moments on octahedral sites split into two groups. In one of these, transverse components are antiparallel and have the fcc symmetry of the chemical cell. The transverse components of the other group together with those of the tetrahedral sites build a…
Cobalt manganite CoMn2O4 is prepared at 1250°C and quenched from different temperatures. It always crystallizes in centered tetragonal system but its lattice parameters and inversion degree change by quenching. Measurements of paramagnetic susceptibility above the Curie temperature and magnetization in high fields sho…
Photoelectric effect without photons, discussing classical field falling on quantized atomic electron
Four perovskite compounds ATbO3 (A = Fe, Cr, Al, Co) are studied by means of neutron diffraction. Three Nèel temperatures are distinguished. When A is magnetic and T < TN1, the A sublattice orders in a G mode; when T < TN2, the Tb sublattice orders and is coupled with A in the same irreducible representa…
A method is proposed to determine the over-all anisotropy K in ferrimagnetic materials from initial susceptibility of single-domain grain samples. Indications on technology of single-domain grain samples are given. The Ni1−xZnxFe2O4 system is studied in detail. The upper limit of the contribution from dipolar energy h…
The effects of parameters of the needling process—the amount of needling, the needle penetration, the number of passes, the needle arrangement, and the shape of holes—on the structure and properties of needled fabrics are described. In general, increasing the amount of needling and of needle penetration increases the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of silicon dichloridePeter L. TimmsCite this: Inorg. Chem. 1968, 7, 2, 387–389Publication Date (Print):February 1, 1968Publication History Published online1 May 2002Published inissue 1 February 1968https://pubs.acs.org/doi/10.1021/ic50060a046https://doi.org/10.1021…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTPhotochemistry of some square-planar and octahedral platinum complexesVincenzo Balzani and Vittorio CarassitiCite this: J. Phys. Chem. 1968, 72, 2, 383–388Publication Date (Print):February 1, 1968Publication History Published online1 May 2002Published inissue 1 February 1968http…
Abstract The morphology of nascent (i.e., as‐polymerized) Ziegler‐Natta polymers was studied by optical and electron microscopy and x‐ray and electron diffraction. Observations were made on six polyolefins: polyethylene, polybutene, polypropylene, polystyrene, poly‐4‐methylpentene‐1, and polyisoprene. These polymers w…
An account is given of a study of the dimensional changes of plain-knitted fabrics brought about by various relaxation treatments. A wide range of natural and synthetic-polymer fibres was encompassed. It was found that, for synthetic-fibre fabrics, dry tumbling at elevated temperatures causes higher levels of relaxati…
Spontaneous band magnetism occurs as a transitional electron state, in the thermodynamic sense, between a localized-electron (or small-polaron) state and a conventional collective-electron state. The localized-electron state is well described by crystal-field theory, together with superexchange and double-exchange the…
Potentiostatic polarization measurements on exposed (0001), (101¯0), and (112¯0) faces of single crystals and on polycrystalline zinc were made in aqueous solutions of sodium hydroxide. Crystal orientation was observed to have a well defined effect on anodic polarization with overvoltages for active dissolution increa…
Anomalous thermal expansion and its relation to magnetic properties are surveyed for various Invar alloys. Saturation magnetization was measured for alloy systems (FexNi1−x)92M8, where M=Cu, Co, Mn, Cr, and V, and also for Fe70(RexPt1−x)30 at 4.2°K. Sharp drop of the saturation moment occurs at the average electron co…
Abstract Decomposition products of polymers have been determined by many investigators, but the results are often conflicting because of difficulties in analyzing a large number of products. A comprehensive analysis of the volatile thermal decomposition products of high‐density polyethylene has been made with the late…
Abstract The thermal decomposition of polypropylene hydroperoxide (PPH) consists of two consecutive reactions. The initial, faster reaction has rates up to 60 times that of the slower process. The former is largely suppressed by the addition of an excess of 2,6‐di‐ tert ‐butyl‐ p ‐cresol. The course of reaction is the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituted deuteroporphyrins. III. Iron(II) derivatives. Reactions with oxygen and preparations from chloro- and methoxoheminsJames O. Alben, William H. Fuchsman, Charles A. Beaudreau, and Winslow S. CaugheyCite this: Biochemistry 1968, 7, 2, 624–635Publication Date (Print)…
The Eu2+ ion in alkaline earth fluorides produces two broad absorption bands arising from 4f−5d transitions. The band at 3 eV has a structure with six resolved peaks. This structure is independent of Eu concentration. This band is attributed to transitions from the 4f7(8S) ground state to 4f6(7FJ) 5eg, the peaks being…