Materials Literature
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To prevent duplication of effort and to facilitate the building of compatible databases on material property data, ASTM Committee E49 on Computerization of Material Property Data has active efforts underway to develop standards and guidelines in the areas of: (1) designation systems for engineering materials, (2) reco…
With the flux-technique single crystals of (Al, Ge)-mullites have been synthesized in the range of 1.28 A1 2 0 3 · 1 GeO 2 to 1.93 Al 2 O 3 · 1 GeO 2 . Chemical and optical (microrefractometer spindel-stage) data of the solid solution series have been collected. The results of a structure refinement of the mullite 1.9…
The local structured around cobalt and yttrium ions in a 1,2,3-type ceramic oxide containing cobalt instead of copper, YBa1.5K0.5Co3O8, has been characterized by means of extended X-ray absorption fine structure spectroscopy. The crystal structure has been refined by rietveld analysis of X-ray powder diffraction data.…
In this review, the fractals in the fractography is described, using brittle fracture surfaces of chromium and molybdenum, and stress corrosion cracking surfaces of SNCM 439 steel. It is emphasized that the quantitative fractography at the atomic region is opened, combining scanning tunneling microscopy with fractal g…
Abstract The fire‐retardant effectiveness of mixtures of hexabromocyclododecane (HBCD) and artimony oxide (Sb 2 O 3 ) in polyethylene (PE) was examined utilizing differential thermal analysis (DTA), gas chromatography/mass spectroscopy (GC/MS) and limited oxygen index (LOI) techniques. It was determined that the norma…
For many decades dioctyl phthalate (DOP), a common industrial material, has been used by the U.S. Army and other agencies to simulate aerosol behavior in nondestructive gas mask and filter serviceability testing, and for related test purposes. Techniques are completely standardized. But DOP is now considered to be a p…
Abstract The electrical conductivity and the Hall effect for TlGaTe 2 crystals have been measured over a wide temperature range. The crystal used for our study was grown by the Bridgman technique and possessed p‐type conductivity. The energy gap has been found to be 0.84 eV, whereas the ionization energy has the value…
Abstract The structural modifications and the phase state of the gelatin matrix during the sol‐gel transition and gelatin gel deswelling were studied by optical rotation and wide‐angle X‐ray scattering (WAXS) methods. It is shown that the quenching of a solution results in rapid renaturation of macromolecular fragment…
The ionic conductivities of halide sodalites, Na8(AlSiO4)6X2, where X2= Cl2, Br2 or I2, have been investigated over the temperature range 200–550 °C in order to study the effect of the anion size on the sodium ion conductivities. The activation energy for conduction was found to decrease over the range 96.6–71.7 kJ mo…
Infrared reflectance and transmittance measurements between 500 and 1800 cm{sup {minus}1} were obtained on boron carbides with between 10 and 20 atomic percent carbon. Measurements on both boron and carbon isotopically enriched samples indicate that all prominent modes involve boron motion, and that all but a mode nea…
Abstract Modern powder diffraction employing computer-controlled diffractometers now allows quantitative analytical methods to use the whole diffraction trace rather then only individual peaks. Two such methods are in common use the Rietveld method which refines the crystal structures of the component phases as part o…
The behavior of encapsulated LaNi5, a typical hydrogen storage alloy, was investigated with the aim of improving unfavorable behavior such as disintegration. A sieved fraction (250/400 mesh) of LaNi5 particles was encapsulated with polystyrene (polymerization degree 1000–1400). The effect of polystyrene/LaNi5 weight r…
Abstract The glacial deposits of Holderness are well displayed along the coast of Humberside from Bridlington to Spurn Head. These deposits consist primarily of tills which may contain chalky debris and include pockets and lenses of sands and gravel. They have been subdivided in the past into four units the Basement,…
Toyohaite, Ag2FeSn3S8, tetragonal, I41⁄a, a=7.464, c=10.80Å, Z=2, is a new mineral corresponding to the Ag analogue of rhodostannite. Microprobe analyses demonstrate partial substitutions of Cu for Ag and Zn for Fe. The most Ag-rich and poor analyses are: Ag 24.39, 16.31; Cu: 0.14, 5.15; Fe 6.28, 6.18; Zn 0.37, 1.29;…
Abstract To prepare thin‐boiling and nongelling adhesives, granular wheat and corn starches were thinned by treatment with aqueous hydrochloric acid or sodium hypochlorite and then hydroxypropylated with propylene oxide. Chlorine oxidation gave more rapid chain cleavage and whiter products with better freeze‐storage s…
A study was made on the effect of cold rolling reductions of 80 to 94% on secondary recrystallization in grain-oriented electrical steel produced by the single-stage cold rolling process. The following conclusions were derived from the study.(1) As the cold rolling reduction increases, secondary-recrystallized grains…
Duplex stainless steel is widely used in various service conditions due to its high mechanical properties and high corrosion resistance. However, there have been few studies on the corrosion resistance of duplex stainless steel in highly oxidizing nitric acid, such as hot nitric acid containing Cr6+ ions. In this stud…
The dynamic-compression properties of carpet are expected to play an important role in their mechanical performance, but it is difficult to measure these properties at frequencies and pressures corresponding to those occurring in carpet wear. A new vibration technique has been developed which enables the dynamic modul…
Structural data have contributed greatly to the understanding of the oxide superconductors. However, it is increasingly clear that a knowledge of the average structure is not sufficient. Structural defects, which are present in essentially all of these systems, have a profound effect on the superconducting properties.
Abstract The magnitudes of the peak intensities in a powder diffraction pattern are not uniformly distributed as a function of diffraction angle. The Lorentz-polarization factor, X-ray form-factor and the thermal vibration parameters all conspire to progressively decrease the intensities of the peaks as sinθ/λ increas…