Materials Literature
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Measurements of birefringence, light scattering, second harmonic light generation and scattering have been made simultaneously at the α-β transition of quartz. They have been correlated with a coexistence zone (observed visually) of α and β phases in the hysteresis region and with Dauphine twinning.
Interatomic and intermolecular ordering in amorphous polymers can be characterized by radial distribution functions (RDF) derived from radiation scattering measurements (X-rays, neutrons, etc.). The type of information which may be derived from RDF data in monatomic systems is illustrated by measurements on a sample o…
Variable-temperature (4·2–270K) magnetic susceptibility, e.s.r., and single-crystal X-ray crystallographic data are presented to show that a predominantly dz2 CuII ground state can lead to appreciable magnetic exchange interactions via the extended bridges in [Cu2(Et5dien)2(C2O4)][BPh4]2, [Cu2(Me5dien)2(N3)2][BPh4]2,…
It has been suggested that the poisonous emissions from spark ignited internal combustion engines can be reduced by lowering the combustion temperature. Combustion under the lean mixture is one way to lower the combustion temperature. To make the engine operate under the lean mixture, a new stratified charge combustio…
An investigation has been made of the movement of conducting particles, under the action of the applied electric field, on the surface of an insulating spacer immersed in SF6 between 0.47 and 1.5 MPa. Spheres moved fairly readily but particles of an irregular geometry, such as filings, did not. Movement was more prono…
A three-dimensional X-ray structure analysis by the heavy-atom method of 2SbCl3·C6H4Me2 is described. Crystals are monoclinic, space group P21/c, a= 9.13(4), b= 8.44(2), c= 12.79(4)Å, β= 125.35(20)°, Z= 2. Least-squares refinement of photographic data led to R 0.11 for 920 independent reflections. The structure is ess…
Trials to enhance the decarburization and the denitrogenization of molten Fe-Cr alloys were made by blowing plasma jet of argon-hydrogen gas mixture on to the surface of molten metals. The weight of melts was 1 to 3kg, the gas blowing rate 8 t/min and the electric power consumption 15 to 30kVA. The final concentration…
119 Sn Mössbauer spectra have been recorded for a number of ternary sulphides isolated from the systems Na2S–SnS2, BaS–SnS2, and PbS–SnS2. The series includes compounds of known crystal structure such as Na4SnS4, Na6Sn2S7, the high- and low-temperature forms (HT and LT) of Ba2SnS4, and Ba3Sn2S7, all of which contain t…
The investigation described was aimed at establishing the degree of compatibility between a plain carbon pipeline-type steel and hydrogen and also hydrogen-rich environments containing small additions of H2S, O2, H2O, CO, CO2, CH4, and natural gas at pressures near 1 atm. Test were carried out under conditions of stat…
Selection of a material for the primary containment vessel of a Molten-Salt Breeder Reactor has required the development of an alloy to resist corrosion by both the UF 4 and the fission product tellurium contained in the fuel salt. Thermal convection loop corrosion studies have been performed to establish the time and…
Crystal structures and magnetic properties of the compounds Pt1−xAuxMnSb have been investigated by means of X-ray diffraction and magnetic analysis, respectively. It has been found that the lattice parameters of the pseudo-ternary compounds increase with increasing Au concentration. The magnetic moment per Mn atom in…
It is shown that a single transient optical or electrical signal may be used to modulate an electron beam so that subsequent dispersion of the beam generates an output electrical signal similar to the input signal but lengthened in time. The design and performance of an instrument utilizing this principle to transform…
Microstructural studies of metals and materials using transmission electron microscopy frequently involve the correlation of information present in both images and diffraction patterns. This process may be relatively easy if the interpretation of the images and diffraction patterns is simple. However, in many cases th…
ASME SA-105 Grade II steel, which is used in high-pressure hydrogen compressor systems, is similar to steels used or considered for use in high-pressure hydrogen storage vessels and pipelines. This paper summarizes the results of a program conducted to provide cyclic-load crack growth rate (da/dN) data for a fracture…
Sugilite occurs as an essential mineral amounting to 3–8 percent by volume in aegirine syenite from Iwagi Islet, Ehime Prefecture. It is associated with albite, aegirine, pectolite and a Ca-K-Ti silicate (a still to be identified mineral). Sugilite is light brownish yellow, luster vitreous, streak white. Symmetry hexa…
The results of a four-year research and development program specifically directed to the investigation and evaluation of the voltage-dependent phenomena, characteristics, and requirements of dc overhead lines in the +-400 to +-600 kV range are presented. From its inception, the Project was considered investigatory in…
We study the stability of a Poiseuille flow in a planar nematic, with respect to a uniform distortion of the director. We develop a linearized hydrodynamic theory which allows one to characterize the symmetry of the unstable modes. One expects two types of solutions according to the presence or not of a net transverse…
The 0-lattice theory is a geometrical approach to interface structure. The basis of the theory is that interfaces are ordered. The 0-lattice theory is completely general and embodies many of the concepts of the theories of twinning, martensitic crystallography, and the coincidence site lattice, each of which may be re…
Equilibrium vapour pressures of barium sulphate and free surface sublimation pressures of single crystals were both measured for the first time, using torsion–effusion and torsion–Langmuir techniques, respectively. Mass spectrometer measurements showed the principal decomposition reaction to be BaSO4(s)→ BaO(s)+ SO2(g…
The effects of time and temperature of tempering on the resistance to corrosion of α 0·29%C, 13%Cr steel have been investigated. The results are discussed with reference to proposed mechanisms of accelerated corrosion resulting from certain treatments. A mechanism whereby local chromium depletion of the matrix is caus…