Materials Literature
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Abstract Multiple bands or strata of soil materials, which are finer textured and browner or redder colored than the material above or below, have been studied. These bands are common in unconsolidated sandy Coastal Plain and glacial deposits. In Virginia, North Carolina, and South Carolina they are found to lie nearl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlame-Resistant Polymers. Polyphos-phates and Polyphosphonates from Di-hydroxy CompoundsH. W. Coover, R. L. McConnell, and M. A. McCallCite this: Ind. Eng. Chem. 1960, 52, 5, 409–411Publication Date (Print):May 1, 1960Publication History Published online1 May 2002Published i…
Configurations of individual dislocations in zinc have been studied by electron transmission microscopy and by x-ray diffraction microscopy. Loops of sessile dislocation have been observed surrounding stacking faults lying on (0001) planes. These loops were evidently formed by condensation of point defects. Changes in…
The possibility is examined that Brown's paradox results from the assumption that the shape of the crystal considered is ellipsoidal. It is argued that the large local demagnetizing fields developed near sharp corners of a uniformly magnetized crystal cause the appearance of closure domains, which serve as nuclei of r…
Stress‐strain curves were obtained in flexure and in tension on single crystals of MgO. A decrease in iron content and high‐temperature heating and rapid cooling caused a decrease in strength and increase in ductility. Heat‐treatment of previously deformed specimens increased their strength. The slip band structures r…
The net energy of blackstrap molasses for fattening has been determined by use of the comparative slaughter technique. The feeding of molasses at 10% in the ration significantly increased fat deposition while not significantly increasing total gain over the basal ration. Molasses at 25 and 40% levels resulted in lower…
Glass formation has been found to be extensive in the systems As‐TI‐S, As‐Tl‐Se, and As‐Se‐S. Glasses in these systems exhibit unique low‐melting properties; some are highly fluid as low as 185OC. The marked effect of thallium in lowering the viscosity of binary As‐S melts was found to be unique among all the metallic…
Studies made on low‐hafnium‐content ZrO 2 , show that the monoclinic‐tetragonal inversion temperature is 1170°C., and it is raised to approximately 1190°C. in the “natural” ZrO 2 , which contains approximately 2% HfO 2 . No explanation could be found for the knownmarked hysteresis during cooling, when the reverse poly…
Alloys of gadolinium with some of the transition elements were prepared and examined by x-ray and magnetic techniques in an effort to determine their structure, Curie temperatures and magnetic moments. Values obtained for the saturation magnetization for some compositions in the gadolinium-cobalt system were higher th…
The anomalies of electrical and magnetic properties in invars at low temperatures and the fact that these anomalies are observed in Fe-Ni alloys with the nickel content ranging from 30 to 40% are explained on the grounds of an assumption that the exchange integral of electrons of neighboring ions of iron in a face-cen…
Practical thermoelectric cooling has become a reality with the development of thermoelectric semiconductor materials. To illustrate this type of cooling, several devices which represent applications in the electronics industry and medicine are described.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Temperature Changes in Alumina Structure and Activity of Platinum-Alumina CatalystsR. F. Waters, J. B. Peri, G. S. John, and H. S. SeeligCite this: Ind. Eng. Chem. 1960, 52, 5, 415–416Publication Date (Print):May 1, 1960Publication History Published online1 May 2002Publ…
The temperature-independent paramagnetism of permanganate is discussed in terms of molecular orbital theory. It is shown that the major contribution to the paramagnetism arises from electrons in metal d orbitals, and that the amount of charge-transfer from the ligands to the metal ion can be estimated. The theory is a…
The emission bands of cadmium selenide activated by silver, copper, and gold, and coactivated by trivalent metals, were found at 0.92, 1.20, and 1.45 μ, respectively, at the temperature of liquid nitrogen. The silver band is completely quenched at room temperature. A near edge emission of CdSe was found at 0.72 μ.
Hydrogen absorption by and the desorption rate of hydrogen from steel were studied as a function of cold work from 0 to 55.4 percent reduction using cold-drawn capped and killed SAE 1020 steel. Increased cold work increased the hydrogen solubility in these steels. Hydrogen desorption rate increased with increasing col…
A study of the vaporization of La 2 O 3 , Nd 2 O 3 , and Y 2 O 3 at high temperatures has been carried out by the Knudsen effusion technique. The methods employed, the results of the measurements, and the low‐temperature heat capacities of these materials, which were determined for the purpose of calculating thermal f…
In a search for further examples of Heusler-type alloys, ferromagnetic alloys were found near the composition Ni2MnIn, Ni2MnGa, Co2MnGa, Pd2MnSb, and PdMnSb. The first four alloys are tentatively identified as having the L21(Heusler)-type structure; PdMnSb, the Cl1-type structure. Previous work has indicated that ferr…
The connection between intermolecular potential energies and the unit cell vibrational frequencies in molecular crystals is summarized in Sec. I. Details of the treatment of potentials which can be written as functions of intermolecular atom-atom distances are developed. The frequencies of vibration of methyl chloride…
The system $$CaCO_{3}-MgCO_{3}-MnCO_{3}$$ was investigated at temperatures of 500°, 600°, 700°, and 800° C. and 10 kilobars total pressure. Three two-phase areas and one three-phase triangle are observed, and an additional two-phase area is inferred. At 500° C. there are two single-phase regions, which enlarge and mer…
Single crystals of NiO have been annealed and stressed at room temperature to sweep out twin boundaries. Neutron diffraction and rotational torque studies have been made on a crystal which had only 1.3% of the twin orientation. The ferromagnetic sheet structure originally proposed in which the atomic moments lie in(11…