Materials Literature
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The average grain size of ZrO 2 (+Y, o,) materials sintered at 1400°C was observed to depend significantly on the Y 2 O 3 content. The average grain size decreased by a factor of 4 to 5 for Y 2 O 3 contents between 0.8 and 1.4 mol% and increased at Y 2 O 3 contents of 6.6 mol%. Grain growth control by a second phase i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the silver(II) and zinc(II) derivatives of meso-tetraphenylporphyrin. An exploration of crystal-packing effects on bond distanceW. Robert Scheidt, Jalal U. Mondal, C. W. Eigenbrot, Alan Adler, L. J. Radonovich, and J. L. HoardCite this: Ino…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of various anions by magnesium aluminum oxide of (Mg0.7Al0.3O1.15)Tsugio Sato, Takayoshi Wakabayashi, and Masahiko ShimadaCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 1, 89–92Publication Date (Print):March 1, 1986Publication History Published online1 May 2…
We show that space-charge injection from a needle into a dielectric can be determined with a resolution of 10−15 °C, by using guarded needle electrodes and a charge compensating bridge circuit. The technique is applied to epoxy resin samples. A well-defined homogeneous space-charge cloud formation is observed in quant…
Due to the recent availability of an experimental value for the second- and third-order electric polarizabilities of the HF molecule, possible errors in the previous prediction of these quantities have been considered. These include basis sets, vibrational corrections, frequency dependence, infinite-order correlation…
Both tetragonal ( t ) and monoclinic ( m ) ZrO 2 particles in ZrO 2 ‐toughened Al 2 O 3 can give rise to toughening. In the stress field of propagating cracks, the t ‐ZrO 2 particles can undergo the stress‐induced t → m transformation, and the residual stresses around already‐transformed m ‐ZrO 2 particles can cause m…
The local structural environments of Y 3+ and Zr 4+ in 18 wt% Y 2 O 3 ‐stabilized zirconia were studied using extended X‐ray absorption fine structure spectroscopy over the temperature range –120° to 770°C. The measured cation‐oxygen distances reflect those of the parent oxides, with the mean Zr‐O distance 0.017 nm sh…
Auger electron spectroscopy has been used to study the interface between human tissue and implants of titanium and stainless steel. Both the thickness and the nature of the oxide layers on the implant have been found to change during the time of implantation. The stainless steel implants have a surface oxide about 50…
Starting from a simple model of the distributions of charge created in an insulator by bombardment with electrons, the components of the electric field are evaluated by using Maxwell’s equations and image effects. The results are applied to the most common experimental situations: a semi-infinite sample (i) bounded by…
We present a systematic experimental study of the high-temperature susceptibility of diluted magnetic (semimagnetic) semiconductors ${\mathrm{Cd}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Mn}}_{\mathrm{x}}$Se, ${\mathrm{Cd}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Mn}}_{\mathrm{x}}$Te, and ${\mathrm{Hg}}_…
We express the cubic (Al, Zn)49Mg32 structure as a periodic packing of the rhombohedra1 cells from the three-dimensional Penrose tiling, decorated by atoms. This decoration is extended to the aperiodic quasicrystal packing of the same cells to give a hypothetical structure for the recently discovered icosahedral phase…
Rapid advances are being made in the science and technology of cement manufacture and use are being made. Time and space permit me to highlight only a few selected topics. However, the main stimulus for cement research arises from economic factors both in manufacture and use which in turn suggest certain lines of rese…
We describe a new method for the determination of the composition of Portland cement mixtures with active additions and the identification of the type of addition. This method enables us to classify a Portland cement or Portland with active additions, whatever this addition may be, and it is specially suitable for dis…
Infrared spectroscopy is a very useful technique in Cement Chemistry. This work is devoted to the study of a large number of sulphates that should have an incidence in false set phenomena, and they are qualitative and semi-quantitatlvely studied when they are in some degree in the clinker or in the portland cement.
Abstract The analysis of low velocity impacts is necessary for designing everything from safe automobiles to safe shipping casks for nuclear material. Although great strides have been made in reducing the cost of impact analysis, the cost must be reduced even more before impact analysis becomes a routine design tool.…
SUMMARY Frozen hydrated specimens of various latex spheres were used as well‐defined systems for the study of electron beam radiation damage to organic inclusions in vitreous, cubic and hexagonal ice. We found that radiolysis of organic material is modified by the presence of ice and that radiolysis in vitreous ice is…
Abstract A study has been made of the mechanical, thermal, and morpholigical characteristics of melt‐crystallized isotactic polypropylene containing high levels of the β or pseudohexagonal crystalline form. Different levels of β‐form crystallinity were produced in the polymer by blending in low levels of quinacridone…
Dipolar interactions between silver particles arranged on a square two-dimensional grating give rise to characteristic features in the wavelength dependence of surface-enhanced Raman scattering from adsorbed molecules. The interactions produce two pronounced effects: first, they shift and broaden the plasmon resonance…