Materials Literature
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Lithium metavanadate is monoclinic with a = 10.158(2), b = 8.4175(9), c = 5.8853(9) Å, β = 110.48(2)° and probable space group C2/c. The structure, refined by least-squares to a ωR = 0.033 using 851 reflections, is isotypic with LiAlSi 2 O 6 (spodumene) and LiFeSi 2 O 6 . Bands of Li—O edge-shared octahedra run parall…
The paramagnetic behavior of localized states in amorphous chalcogenide alloys and the tetrahedrally coordinated amorphous germanium has been studied by ESR experiments. No signal has been detected in any of the chalcogenide glasses, prepared by quenching from the melt, with a sensitivity of about ${10}^{11}$ spins/G…
Experimental values of the $g$ and hyperfine components of ${{X}_{2}}^{\ensuremath{-}}\ensuremath{-}{V}_{K}$ centers and ${{Y}_{2}}^{\ensuremath{-}}\ensuremath{-}{V}_{K}$-type centers ($X, Y=\mathrm{F},\phantom{\rule{0ex}{0ex}}\mathrm{C}\mathrm{l},\phantom{\rule{0ex}{0ex}}\mathrm{B}\mathrm{r},\phantom{\rule{0ex}{0ex}}…
Infrared reflectivity and absorption measurements have been made on single-crystal epitaxial GaN on (0001) $\ensuremath{\alpha}\ensuremath{-}$${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ crystals. Analysis of the normal-incidence reflectance data on low-carrier-concentration layers using the Kramers-Kronig technique and diel…
The diffraction patterns of both silica and germania glasses are consistent with a structure in which nearly all of the atoms belong to tridymite-like regions of up to about 20 angstroms or more that are bonded efficiently together in a manner analogous to that found in twinned crystals.
SUMMARY In situ tensile straining was carried out in the 1 million volt electron microscope in an attempt to clarify the mechanism(s) of superplasticity in the Zn/Al eutectoid alloy. The dynamic microstructural observations in the 1 MV microscope at 100°C at an m value of ∼0.3 were consistent with 100 kV observations…
Abstract In order to study thermal degradation of copolymers and homopolymer mixtures of methyl methacrylate, ethyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, and styrene mild pyrolysis on a hot filament, followed by gas chromatography, was used. For each of the eight monomer pairs, at least eleven…
Thirty‐two years after the addition of high rates of potassium to two Illinois experiment fields, the largest gain in soil K was in the acid‐insoluble form. Cation exchange capacity of the soil clays had decreased with the increasing addition of K, presumably due to fixation of potassium in the interlattice positions…
The characteristics of secondary electron emission from glass surface by Ar+ ions were investigated experimentally. The yields of glass and quartz microsheets were larger than that of stainless steel. It was first observed that Field Enhanced Emission and Self Sustained Emission were caused by the surface charge. Beca…
The effect of the grain size on the irradiation-induced expansion of diamond has been experimentally shown. Under the similar irradiation conditions (integral neutron flux of 1.4. 1019 n/cm2 E > 75 eV, temperature 130°C) 200 μm and 0.1 μm diamond powers expand up to 0.67 and 1.72% respectively.
The relation between lamellar spacing λ and growth rate v has been studied from the energetic considerations for the lamellar eutectic growth. Three free energy sinks were considered; namely, the kinetic process for solidification, diffusion and solid phase boundary formation. The free energy for the kinetic process w…
The main features are described of the Siemens Elmiskop 101 electron microscope when used in the low angle diffraction mode, and a review is given of the different methods employable for this purpose. Camera length and angular resolving power are given for each of these methods. The possibility of selected area diffra…
An investigation of several new disubstituted cinnamates reveals the existence of liquid crystalline properties, some exhibiting melting points below 60°.
Effects of the plastic deformation by cold rolling prior to or in the course of ageing on the age-hardening of Cu-1.41 wt% Be and Cu-2.01 wt% Be-0.2 wt% Co alloys have been investigated mainly by hardness measurements and electron microscopy. The results obtained are as follows:(1) Cold rolling of the specimens at the…
The effects of temperature, strain rate and oxygen in interstitial solid solution on the yield and flow stresses at low temperatures of alpha Ti–O alloys with 0.04∼0.45 at%O were studied to ascertain the rate controlling dislocation mechanism. The effect of interstitial oxygen atoms on the thermal component of the flo…
SummaryIn this multi-centre general practice study 2,557 patients requiring a diuretic for the treatment of oedema and/or hypertension received a mean daily dose of 37.5mg. mefruside for a mean of 67 days, either alone or in addition to other therapy. Mefruside was substituted in those patients already receiving diure…
The hyperfine interactions which broaden the Mössbauer effect (ME) spectrum in austenitic stainless steel have been investigated with the aid of 57Fe time‐differential perturbed angular correlations (TDPAC). The TDPAC measurements reveal a distribution of electric field gradients at the 57Fe nuclei with a mean value c…
The study by the mass-spectrometric Knudsen-cell method of the vapours in equilibrium with metal oxide + metal phosphide systems at 1000–1700 K made possible the identification of the molecules P2O3, P2O4, P2O5 and P3O6. Their atomization energies were determined, as well as those of the phosphorus oxides prevalent at…
Tilt and twist components are determined for cubic bicrystals meeting at a planar boundary. It is shown that any boundary is nearly either a twist or tilt boundary, but the distinction between the two types is, in some cases, ambiguous.
The solubility of iodine in PDS (polydimethylsiloxane) has been measured for varying degrees of polymerization (number of silicon atoms) from 2 to 470. The data obtained show good agreement with a solubility equation derived on the basis of the following two assumptions : (1) a PDS molecule is composed of several comp…