Materials Literature
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Europium titanate has the cubic perovskite structure containing divalent Eu (7 μB) and tetravalent Ti. From magnetic measurements we find that EuTiO3 is one of the few antiferromagnetic materials with a positive θ (TN=5.3°K, θ=3.8°K). At 1.3°K the magnetic moment (σ) increases linearly with field to 10 kOe; above 14 k…
Previous measurements of the critical temperature (Tcrit) for the first-order antiferromagnetic-ferromagnetic transition in FeRh as a function of magnetic field have established that the total entropy change at the transition (ΔS) is much larger than the estimated change in lattice entropy (ΔS)lat. This study has now…
THIS BOOK gives an introduction to the hydrodynamics of inviscid fluids and is, after the preliminary chapters, mainly concentrated on two-dimensional motions.There is a full treatment of the general two-dimensional motion of an immersed cylinder with particular reference to the flow past a thin airfoil and past an in…
Ferroelectricity and weak ferromagnetism have been found to set on simultaneously in Ni3B7O13I at about 64°K. This is evidenced by dielectric hysteresis, spontaneous Faraday effect, quadratic magnetoelectric hysteresis, etc. The strong coupling between the mutually perpendicular spontaneous polarization—[001]—and spon…
SUMMARY The percentage of total intramuscular collagen solubilized by heating in 1/4‐strength Ringer's solution, muscles from 98 cattle, 15 sheep, and 9 pigs at 77°C for 1 hour decreased as chronological age increased. Total intramuscular collagen was high in very young (8‐9 weeks) bo vines and in two of the three ver…
Received 27 January 1966DOI:https://doi.org/10.1103/PhysRevLett.16.354©1966 American Physical Society
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Cathodic depolarization of mild steel by Desulfovibrio desulfuricans was demonstrated with benzyl viologen used as an electron acceptor. Direct measurement of the cathodic depolarization current indicated a maximum current density of 1 microampere per square centimeter. Aluminum alloys were also cathodically depolariz…
Abstract An investigation of the diffusion of electrolytic hydrogen through membranes of: (1) polycrystalline Armco iron; (2) single crystal Armcoiron; (3) zone refined iron; and (4) A.I.S.I. 4340 has been made. The temperature and stress dependence of the permeation rate through (1) and (4) was investigated, while (1…
The hydrogen positions in the crystal structure of copper formate tetrahydrate have been determined, and some new data on the antiferroelectric phase transition at −38.9°C are presented. It is shown that the orientation of the water molecules is disordered in such a way as to permit all possible short 0–0 contacts to…
A study has been made of the interaction of oxygen with samples of zinc oxide and ultraviolet-irradiated magnesium oxide using electron paramagnetic resonance techniques. Adsorption of oxygen at room temperature results in the rapid formation of a radical species, having gxx=2.077, gyy=2.0011, and gzz=2.0073 for oxyge…
A study of Ba2xSr2–2xFeMoO6 solid solutions with the ordered perovskite structure showed that their Curie points increased nonlinearly as the amount of strontium increased while their cell sizes decreased with greater quantities of strontium. By substituting calcium for strontium in Sr2FeMoO6 a decrease in Curie point…
Room-temperature reflectivity measurements of Ca${\mathrm{F}}_{2}$ in the fundamental-lattice-vibration region were obtained between frequencies 200 to 650 ${\mathrm{cm}}^{\ensuremath{-}1}$ and angles of incidence ranging from near normal to 78\ifmmode^\circ\else\textdegree\fi{}. Based on the method of classical oscil…
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…