Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical control of superconductivity in the hexaboridesKurt Hiebl and M. J. SienkoCite this: Inorg. Chem. 1980, 19, 7, 2179–2180Publication Date (Print):July 1, 1980Publication History Published online1 May 2002Published inissue 1 July 1980https://doi.org/10.1021/ic50209a07…
To verify the condensation of higher-order harmonics of the soft mode in incommensurate phase, group-theoretical consideration and detailed structure analysis have been made of the incommensurate phase of thiourea. The group-theoretical consideration shows that extinction rules observed by neutron diffraction imply co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntense satellites in the N 1s x-ray photoelectron spectra of certain metalloporphyrinsS. Muralidharan and R. G. HayesCite this: J. Am. Chem. Soc. 1980, 102, 15, 5106–5107Publication Date (Print):July 1, 1980Publication History Published online1 May 2002Published inissue 1 J…
Abstract Polyphosphate and polyphosphonate esters of molecular weights > 10,000 were synthesized by base‐promoted, liquid‐vapor and liquid‐liquid interfacial polycondensations of hydroquinone (HQ) with 4‐methylthiophenyl phosphorodichloridate (MTPP) and phenylphosphonic dichloride (PPD). The barium hydroxide‐initia…
Abstract Die Zustandsdiagramme der Systeme ACl/EuCl 2 und ACl/SrCl 2 (A = Cs, Rb, K, Na, Tl) wurden mittels Differenzthermoanalyse aufgestellt. In den Systemen mit CsCl und RbCl existieren Verbindungen AMCl 3 ; die Hochtemperaturmodifikationen kristallsieren im kubischen Perowskit‐Typ, bei tieferer Temperatur treten V…
Abstract The air oxidation of poly‐ p ‐xylylene films was studied at temperatures between 125 and 200°C. The oxidation kinetics were obtained from neutron activation (NA) oxygen analyses and infrared (IR) Spectroscopy. A correlation between the NA oxygen analyses and mechanical properties indicated that the amount of…
Microalloyed steels show a greater atmospheric corrosion resistance than plain carbon steels through the formation of protective films, designated as patinas. During the development of these films, they present a continuous double layer structure. The inner phase is the only one left after long exposure periods and is…
The bypass of particles by climb necessarily results in an increase in length of a dislocation, provided its ends are anchored at network nodal points. The energy associated with this length increase is provided by the applied stress. It follows that a critical threshold stress for the climb process, and hence for rec…
Metallic cations are effective corrosion inhibitors under certain experimental conditions. They may also be virulent activators of corrosion in acids in the case of cations which in the metallic form may have high exchange densities for hydrogen evolution. Eleven mechanisms whereby metallic cations inhibit corrosion a…
Abstract All materials are subject to aging, a process of long‐term degradation, but not at the same rate or affected in the same manner. The wide variation in susceptibility (or resistance) of polymers to various degradative agents, e.g., oxidative, thermal, mechanical, chemical, biological, depend on their chemical…
In order to explain the influence of carbon on the embrittlement of 12%Cr steels, a systematic study of the effects of tempering on AISI 410 steel was carried out. Reversible temper embrittlement was detected and related to the mechanical properties and microstructural variations and to the segregation of carbon and a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer and Raman spectra of carbon-supported iron phthalocyanineCarlos A. MelendresCite this: J. Phys. Chem. 1980, 84, 15, 1936–1939Publication Date (Print):July 1, 1980Publication History Published online1 May 2002Published inissue 1 July 1980https://pubs.acs.org/doi/10…
The defect microstructure of electron-irradiated α-quartz was studied by transmission electron microscopy. Formation of heterogeneously-nucleated disordered strain centers and a homogeneous crystalline → amorphous transformation of the surrounding matrix were observed. Both features are shown to be attributable to rad…
Positive carbon-containing electrodes conveying 5 or more microA of constant direct current per cm2 showed bactericidal activity on intact back skin of 13 human subjects. This effect increased with the duration of stimulation up to a total surface bacterial kill at 20 h. When total current and current density were var…
The Raman spectra of NH4I and ND4I are reported at pressures up to 130 kbar and the II–IV transition in this compound is observed to occur at 27(5) kbar at room temperature. The Raman spectral changes which characterize this transition are very subtle and it is concluded that a considerable amount of disorder can stil…
Abstract Cold‐drawn and hot‐drawn samples of poly(ethylene terephthalate) were studied by means of measurements of shrinkage stress, birefringence and differential scanning calorimetry (DSC). The values of shrinkage stress were comparable for both types of sample, implying that the deformation of a molecular network i…
Abstract A new one‐dimensional model for penetration analysis of a rigid projectile into a soil target is presented. The soil medium is represented by a set of discs of constant thickness, responding in the radial direction under plain strain regime. When penetration through a typical disc occurs, the projectile displ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of (5,10,15,20-tetra-N-propylporphinato)lead(II): a "roof" porphyrinK. M. Barkigia, J. Fajer, A. D. Adler, and G. J. B. WilliamsCite this: Inorg. Chem. 1980, 19, 7, 2057–2061Publication Date (Print):July 1, 1980Publication History Published on…
Abstract The prediction of the lifetime of a polymer by extrapolation from weight‐loss data requires a thorough analysis of degradation kinetics over a wide temperature range. Techniques are described in which entire kinetic spectra are compared among experiments performed at heating rates from 6 deg/min to 9 deg/day.…
ABSTRACT The mechanical behavior of selected food powders was studied by an Instron UTM through compression, decompression, and stress relaxation tests. Powders in moist or cohesive state were considerably more deformable than in dry or noncohesive state. Upon decompression, cohesive powders remained compacted while t…