Materials Literature
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This paper presents a mechanistically consistent model of impact damage based on elastic failures due to tensile and shear overloading. An elastic axisymmetric finite element model is used to determine the dynamic stresses generated by a single particle impact. Local failures in a finite element are assumed to occur w…
A corrosion program is being carried out to establish the long-term corrosion behavior of candidate alloys for the prototype nuclear process (PNP) reactor primary circuit. Results are presented for corrosion tests performed in impure helium over the temperature range of 700 to 900 °C for times up to 10000 h.In the hel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics and kinetics of carbon dioxide chemisorption on calcium oxideDario Beruto, Rodolfo Botter, and Alan W. SearcyCite this: J. Phys. Chem. 1984, 88, 18, 4052–4055Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published inissue…
Metallized film capacitors consist of alternating layers of polypropylene or other polymeric film dielectric and vapor deposited aluminum conductor. During operation above 250 V ac (RMS), circular islands of oxide develop in the aluminum conducting layers and reduce the capacitance. Increasing the aluminum layer thick…
Abstract X‐ray‐induced Auger electron spectroscopy (XAES) was used to examine the surface chemical states of hydrogen implanted metals. The chemical shifts of the M 4,5 N 2,3 V Auger peaks from their metallic states were 1.0 eV, 3.3 eV and 2.2 eV, respectively, for ion‐implanted Y, Zr and Nb. The separation energies w…
We report results obtained with our recently automated low-temperature, adiabatic calorimeter. A brief description of the changes in the instrument are provided. The heat capacities of natural osumilite (Kee3Naa.seCao.ozBaoelMgl s6Fee.3sTis.s1Ala.62 Siro rzOro) were measured from 340 to 1000 K by differential scanning…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColor centers and clustering in liquid alkali metal-alkali halide solutions approaching the nonmetal-metal transition: an optical studyW. Freyland, K. Garbade, H. Heyer, and E. PfeifferCite this: J. Phys. Chem. 1984, 88, 17, 3745–3749Publication Date (Print):August 1, 1984Pu…
A method for measuring the solubility limit of refractory oxides in glass is presented, and the solubilities of Al 2 O 3 , ZrO 2 , SnO 2 , and Cr 2 O 3 in soda‐lime glass are given as a function of temperature. The order of solubility in soda‐lime glass is Al 2 O 3 ZrO 2 SnO 2 Cr 2 O 3 at 1300° to 16Q0°C. The solubili…
With respect to their phase transitions, Cs2CdBr4 and Cs2HgBr4 are the first known representatives of a new group having the flK2SO4-type structure. Upon coolmg they show the following phase sequence. Phase I: Pnma, Z -4. Cs, Cd /Hg and two Br are in special positions on the mirror plane. Second-order phase transition…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
Abstract The hexamolybdo-platinate(IV) anion, [PtMo6O24]8− has been found to have two geometrical isomers, one having the Anderson structure and the other having the same framework with the heptamolybdate ion reported by Lindqvist.
Creep and stress rupture properties are determined for the candidate materials to be used in high-temperature gas-cooled reactor (HTGR) components. The materials and test methods are briefly described based on experimental results of test durations of ∼20 000 h. The medium creep strengths of the alloys lnconel-617, Ha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluences on carbon monoxide and dioxygen binding to iron(II) porphyrinsKenneth S. Suslick, Mary M. Fox, and Thomas R. ReinertCite this: J. Am. Chem. Soc. 1984, 106, 16, 4522–4525Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published…
Synopsis An image analysis method to measure the human skin microrelief has been previously proposed. This new method has been recently automated, using a 'robot'electronically driven by a Quantimet 900. This 'robot'consists of a change-over specimen driven by four motors, and allows forty Silflo(R) replicas to be ana…
Abstract Ab initio methods have been used to calculate the ground and excited states of “normal” and “hyper” porphyrins. Perturbation theory and CI methods were used to determine differential ground and excited‐state correlation effects for [P v (P)F 2 ] + and [P III (P)] + . A comparison is made to the INDO / S / CI…
Abstract The Raman spectra of a series of WO 3 AI 2 O 3 catalysts containing 1‐30 wt‐% of WO 3 were investigated with respect to the effect of O 2 calcination and H 2 OD 2 O exposure. These studies showed that the frequencies of bands due to surface tungstate species can be shifted reversibly by as much as 6% of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHost-guest complexation. 31. A transacylase partial mimicDonald J. Cram, Howard Edan Katz, and Ira B. DickerCite this: J. Am. Chem. Soc. 1984, 106, 17, 4987–5000Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published inissue 1 August 19…
Large-facetted monocrystals of blue phase I are grown and observed in coexistence with the isotropic liquid. Observations of this three-dimensional polyhedral habit, combined with a conjecture that facets perpendicular to screw axes are absent, are compatible with the $I({4}_{1}32)$ space group for blue phase I. The (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of carbon dioxide on titanium dioxide and platinum/titanium dioxide studied by x-ray photoelectron spectroscopy and Auger electron spectroscopyKatsumi Tanaka, K. Miyahara, and I. ToyoshimaCite this: J. Phys. Chem. 1984, 88, 16, 3504–3508Publication Date (Print):Au…
Single-crystal time-of-flight neutron diffraction techniques have been applied to the analysis of oxygen behavior in the structure of yttria-stabilized cubic zirconia, Zr(Y)O/sub 1.862/. Reflection data were collected at room temperature, at 1040 K, and at 1040 K with a 7.8 DC voltage across the (100) and (100) crysta…