Materials Literature
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Neutron diffraction measurements on powder samples confirm that the magnetic moments in MnO are arrayed in ferromagnetic sheets parallel to {111} planes, with neighboring planes coupled in an antiferromagnetic fashion. The long-range order parameter $S$ increases progressively with decreasing temperature below the N\'…
The dc mobility of electrons is considered for scattering by acoustical and optical phonons. It is shown that the vertex terms (ladder diagrams) in the mobility integral can be partially summed to all orders of perturbation theory. These vertex terms are shown to be important for acoustic-phonon scattering. The sum of…
Longitudinal and transverse magnetoresistance has been measured in iron single crystals at 300, 77, and 4.2\ifmmode^\circ\else\textdegree\fi{}K in fields up to 50 kOe. For most field and current directions the magnetoresistance reverses sign between 300 and 4.2\ifmmode^\circ\else\textdegree\fi{}K in both high and low…
M\"ossbauer spectra of ${\mathrm{Fe}}^{57}$ in $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ have been measured as a function of particle size and temperature. Bulk $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ shows a change in the sign of the quadrupole interaction in go…
Abstract In einer Reihe vorangehender Untersuchungen wurde die Herstellung molekulareinheitlicher, phenolischer Mehrkernverbindungen beschrieben. Sie besitzen je Phenolbaustein eine phenolische Hydroxylgruppe, wie systematisch untersuchte Acylierungen sowie Methylierung und Arylierung dieser Mehrkernverbindungen zeige…
Abstract On the basis of optical rotatory dispersion data and other evidence, it was attempted to classify the proteins according to the conformation of their polypeptide chains. Three large groups of globular proteins emerge: 1. proteins with a high α‐helix content, 2. proteins with a low α‐helix content, and 3. the…
Abstract Drei verschiedene Darstellungsverfahren für Graphitoxyd wurden verbessert und die erhaltenen Präparate miteinander verglichen. Das älteste, von Brodie beschriebene Oxydationsverfahren liefert fast weißes, sehr stabiles Graphitoxyd, das sich im Verpuffungspunkt, im Schichtabstand und in seiner spezifischen Obe…
A crystalline solid, formed by oxidation of phthalocyanatomanganese(II) in pyridine, has been identified as phthalocyanatopyridinemanganese(III)-micro-oxo-phthalocyanatopyridinemanganese(III)dipyridinate(C(74)H(42)Mn(2)N(18)O2C(5)H(5)N) byx-ray diffraction methods. This novel molecule consists of two manganese complex…
The influence of the distribution of 235U, 239Pu, and 233U in water on the minimum critical mass, the minimum critical concentration per unit length of cylinder, and the minimum critical mass per unit area of slab surface is calculated. Two energy groups are employed in the calculations with parameters normalized to f…
An extensive survey of the clay minerals and the other mineral colloids of many soils led to the conclusions that the chemical environment that exists in a soil during its development determines the kind of clay minerals that are being formed and that the frequency distribution of the clay minerals and the other miner…
Abstract Changes in the infrared absorption spectrum of ammonium-saturated rectorite on heating suggest that the ammonium cations are hydrogen bonded to water molecules when the mineral is hydrated. Further spectral changes above 300°C indicate that lattice OH groups are perturbed by protons liberated from the decompo…
Abstract A suite of granodiorite samples was collected by dredging from depths of about 1000 m from the walls of Carmel and Monterey submarine canyons, Monterey Bay, California. One surface of each of the various granodiorite slabs was weathered and encrusted with marine organisms. The weathering is maximum at the sur…
This is an electrochemical evaluation of a chemical inhibitor on the corrosion behavior of mild steel (ASTM A-414) in solutions containing 54 percent lithium bromide and 0.2 percent lithium hydroxide at 25 C (77 F). Inhibiting effects of lithium chromate at concentrations up to 3000 ppm were studied. Results are analy…
Abstract Polycarbonates of methyl, ethyl, n‐propyl, n‐butyl, and n‐hexyl 4,4‐bis(4‐hydroxyphenyl)pentanoate and copolycarbonates with bisphenol‐A of 0.5‐0.9 intrinsic viscosity in dioxane were prepared by a homogeneous CH 2 Cl 2 pyridine method and the physical properties determined. Increasing the number of carbon a…
Abstract Bei der Zersetzung von Eu 3 O 4 an feuchter Luft tritt neben Eu(OH) 3 die Verbindung Eu(OH) 2 · H 2 O auf, deren Darstellung und Eigenschaften beschrieben werden. Aus G UINIER ‐Aufnahmen geht hervor, daß Eu(OH) 2 · H 2 O in der rhombischen Raumgruppe C –P2 1 am kristallisiert und mit Sr(OH) 2 · H 2 O sowie Ba…
Calcium beryllate crystallizes in the cubic system with a0= 14.023 + 0.005/~.Its crystal structure has been determined by standard three-dimensional Patterson and difference Fourier methods.Refinement of the structure in the acentric space group FTt3m by iterative structure-factor least-squares calculations gave a fin…
AN ATTEMPT WAS MADE TO ASSESS THE USEFULNESS OF VISCOELASTIC ANALYSIS AS APPLIED TO THE BEHAVIOR OF ASPHALT CONCRETE AND TO THE BEHAVIOR OF STRUCTURAL SYSTEMS OF WHICH THIS MATERIAL IS A COMPONENT. THE ANALYSIS OF MATHEMATICAL RELATIONS AND SIMPLE MODELS INDICATES THAT THEY HAVE LIMITED APPLICABILITY IN PREDICTING THE…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Temperature Calorimetry in Liquid Oxide Systems. III. The Enthalpy of Formation of Magnesium-Aluminum SpinelA. Navrotsky and O. J. KleppaCite this: Inorg. Chem. 1966, 5, 2, 192–193Publication Date (Print):February 1, 1966Publication History Published online1 May 2002Pub…
Examples are given of the varying morphological habits of kaolinite and illite in sedimentary deposits and soils. Some of the plates may even have a thickness of too few unit cells to permit detection by X-ray analysis. Different nomenclatures and modes of identification have created difficulties in the classification…
Abstract C lay fractions from four soils were analyzed for kaolinite and gibbsite by differential thermal analysis (DTA) and selective dissolution analysis (SDA). The kaolinite values by the two methods had a standard deviation of ±0.95 for the 2–0.2 μ clay of the three most highly weathered soils. Apparently some kao…