Zementit als Substitutionsmischkristall des Austenits
Ableitung des Zementitgitters aus dem kubisch-flächenzentrierten Gitter. Hinweise auf weitere Stützen für die dargelegte Auffassung.
Materials Literature
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Ein Verfahren zur Bestimmung von Halbwertszeiten kurzlebiger gasförmiger Radioisotope. Die Halbwertszeiten des Thorons ( 220 Rn) und Actinons ( 219 Rn)
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 Growth Structures in Hexagonal Ferrites
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…
THE KINETICS OF THE REACTION OF SILICA WITH GROUP I HYDROXIDES
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…
Dissociation Energies of Gaseous Metal Dioxides.
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…
Instability of Spin Waves and Magnetostatic Modes in a Microwave Magnetic Field Applied Parallel to the dc Field
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 OF BURIED METALS
“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…
A Novel Synthesis of the Triborohydride Anion, -B3H8
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…
Magnetic Structure of Chromium Selenide
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…
Magnetic Properties of Intermetallic Compounds in Manganese-Tin System: Mn3.67Sn, Mn1.77Sn, and MnSn2
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…
The Superstructures of Iron Selenide Fe7Se8
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…
THE LANTHANUM—BORON SYSTEM1
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…
Lower Oxidation States of the Lanthanides. Neodymium(II) Chloride and Iodide1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLower Oxidation States of the Lanthanides. Neodymium(II) Chloride and Iodide1Leonard F. Druding and John D. CorbettCite this: J. Am. Chem. Soc. 1961, 83, 11, 2462–2467Publication Date (Print):June 1, 1961Publication History Published online1 May 2002Published inissue 1 June…
One-Dimensional Order-Disorder Model Which Approaches a Second-Order Phase Transition
The calculation of the partition function for a simple one-dimensional order-disorder model is reduced to the solution of a certain functional equation. This equation is solved rigorously and it is shown that in the limit of indefinitely long-range interactions the model exhibits a finite discontinuity in the specific…
Polarization and Diffusion in a Silicate Glass
The self-diffusion of alkali ions in alkali silicate glasses is discussed in terms of the formation, migration, and ultimate annihilation of defects. These defects exhibit a combination of the properties exhibited by Frenkel defects in alkali halides and Bjerrum defects in ice, and are treatable by many of the analyti…
The flow stress of aluminium and copper at high temperatures
The ratio of the flow stress at a high temperature to that at O°C has been measured for polycrystalline Al and Cu, and for single crystals of Al. In Al the flow stress decreases ratio strongly with temperature above a certain critica1 temperature (about 250°C). In Cu a similar but more gradual decrease in the flow str…
Study of the Low-Temperature Transition in Magnetite and the Internal Fields Acting on Iron Nuclei in Some Spinel Ferrites, Using Mössbauer Absorption
A study has been made of the internal fields acting on ${\mathrm{Fe}}^{57}$ nuclei in some spinel ferrites, with particular reference to the low-temperature order-disorder transition in magnetite, using the techniques of M\"ossbauer absorption. For the ${\mathrm{Fe}}^{3+}$ ions at both the octahedral and tetrahedral s…
Analysis of the Absorption and Fluorescence Spectrum of NdCl3 Diluted with LaCl3
The Stark splitting of the identified levels of Nd+3 in LaCl3 were calculated by first-order perturbation. Intermediate coupling wave functions and crystal-field interaction parameters reported by Judd were used. The calculated spectrum agrees with the spectrum observed by Carlson to 5 cm—1.
Theory of Magnetostatic Modes in Long, Axially Magnetized Cylinders
The characteristic equation determining the eigenfrequencies of the magnetostatic modes is derived from the equations of motion and the boundary conditions. The solutions may be classified as pertaining to surface and to volume modes. Surface-mode solutions exist only for sufficiently small wave numbers, and their eig…
Mixed oxides of titanium and niobium. II. The crystal structures of the dimorphic forms Ti2Nb10O29
MIXED OXIDES OF TITANIUM AND NIOBIUM. I distances 1. 95 and 2.76 A between metal and anion, anion and anion respectively in Nb02F; Vousden (1951) 2.00 and 2.82 A for KNbOs, 1.95 and 2-76/~ for NaNb0s; BystrSm's (1944) data for the pyrochlor structure, based upon indirect methods, is not included.