Materials Literature
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The high temperature modification of sodium ferrite, β-NaFeO 2 , has weak ferromagnetism, whose Curie temperature is about 450°C. The magnetic property resembles that of LaFeO 3 . The origin of weak ferromagnetism of β-NaFeO 2 can be attributed to the presence of the Dzyalo-shinsky type interaction in this compound.
The Ru–B and Os–B systems were investigated by x-ray powder diffraction. In addition to Aronsson's hexagonal Ru7B3 phase, two new hexagonal Ru–B phases were found: RuB2(D6h1—P6/mmm, a0=2.852 A, c0=2.855 A) and Ru2B5(D6h4—P6/mmc, a0=2.89 A, c0=12.81 A. In the Os–B system, two new hexagonal phases, isomorphous with the…
This paper describes an instrument for recording the coefficient of static friction between samples of cloth by reciprocating one sample and recording the resultant motion of the other when restrained by springs. Some test results are given for cloths of different structure and those made from yarns spun on normal and…
Fused aluminum oxide containing a small amount of nitrogen (as added aluminum nitride) showed X‐ray powder diffraction patterns similar to the δ‐alumina obtained from the calcination of alumina mouohydrate in dry air. About 1% nitrogen was adequate for complete conversion of the α phase to the δ phase. A fused mixture…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation K. Wihksne, A. E. Newkirk; Electrical Conductivities of α‐ and β‐Phthalocyanine. J. Chem. Phys. 1…
The distribution of the magnetization is calculated for a thick ferromagnetic slab with easy axis transverse to the plane of the slab in a large applied field in the plane of the slab. The calculation predicts a stable nonuniform distribution which has several features suggestive of the domain pattern to be expected i…
The rate of dissociation of oxygen in Xe–O2 mixtures was measured over a temperature range of 3000°K to 6000°K. An x-ray densitometer was used to measure the density during the dissociation process behind a shock wave. It was possible to match the experimental data with theoretical density profiles over a wide range o…
A brief outline is given of the history of wash primers with emphasis on laboratory research. A mechanism is postulated to explain the loss of adhesion with time of WP-1. Topics discussed include phase rule studies of zinc tetraoxychromate, intrinsic viscosities of recovered polymers, reactions involving formation of…
Ableitung des Zementitgitters aus dem kubisch-flächenzentrierten Gitter. Hinweise auf weitere Stützen für die dargelegte Auffassung.
Es wird ein Verfahren zur indirekten Bestimmung von Halbwertszeiten kurzlebiger gasförmiger Radioisotope beschrieben. Das Verfahren beruht auf einem zuerst von MAKOWER und GEIGER benutzten Prinzip; Voraussetzung ist, daß aus den gasförmigen Radioisotopen positiv geladene, relativ langlebige Folgeprodukte entstehen. Di…
Electron microscopic studies of sintered hexagonal ferrites have revealed growth structures which indicate that crystal growth from a relatively highly saturated vapor phase occurs above certain temperatures during the sintering process. Illustrations of variations in the growth structures at various locations in the…
A method is presented for preparing a reproducible silica glass or quartz surface that does not craze during rate of solution measurements in solutions of the five group I hydroxides. For silica glass, initial rates are a maximum at 8 M for at least NaOH and KOH and are an inverse function of ion size for the five cat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDissociation Energies of Gaseous Metal Dioxides.Leo Brewer and Gerd M. RosenblattCite this: Chem. Rev. 1961, 61, 3, 257–263Publication Date (Print):June 1, 1961Publication History Published online1 May 2002Published inissue 1 June 1961https://pubs.acs.org/doi/10.1021/cr60211…
Two methods of calculating the instability threshold are described. The first is a plane-wave analysis which is strictly applicable only in an infinite medium. The second is a more rigorous theory in which the boundary conditions at the surface of the sample are taken into account. The refined theory admits instabilit…
“Surface‐enrichment” is a term which is now commonly used to describe the composition changes which have taken place during the life of a buried noble metal alloy. In fact “surface depletion” might be a better term, since it seems likely that it is the leaching out of the less chemically stable elements which causes t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Novel Synthesis of the Triborohydride Anion, -B3H8Bruce M. Graybill, John K. Ruff, and M. Frederick HawthorneCite this: J. Am. Chem. Soc. 1961, 83, 12, 2669–2670Publication Date (Print):June 1, 1961Publication History Published online1 May 2002Published inissue 1 June 1961…
The magnetic structure of the NiAs-type compound, CrSe, has been determined by means of neutron diffraction. The indexing of superstructure lines which appear below the N\'eel point requires a unit cell three times as large as the conventional unit ($a=\sqrt{3}{a}_{\mathrm{NiAs}}$). Planes parallel to the basal plane…
The magnetic properties of Mn 3.67 Sn, Mn 1.77 Sn, and MnSn 2 were investigated. In Mn 3.67 Sn, an anomalous magnetic phenomenon was found, which may be due to its antiferromagnetism. The Néel temperature T N , the effective number of Bohr magnetons per Mn n p , and the asymptotic Curie point θ a are 365°K, 3.58, and…
Iron vacancies in Fe 7 Se 8 are confined to the alternate iron layers parallel to the c plane of the fundamental lattice with the NiAs structure. The origin of the ferrimagnetisni of Fe 7 Se 8 ( T c =187°C) may be attributed to this ordered arrangement similarly to the case of Fe 7 Se 8 . There are two types of the su…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE LANTHANUM—BORON SYSTEM1Robert W. Johnson and A. H. DaaneCite this: J. Phys. Chem. 1961, 65, 6, 909–915Publication Date (Print):June 1, 1961Publication History Published online1 May 2002Published inissue 1 June 1961https://pubs.acs.org/doi/10.1021/j100824a004https://doi.o…