Elastomeric polymer networks
Looking at recent advances in the area of elastomers and rubber-like elasticity, this monograph reviews and evaluates existing elastomers and presents some new results.
Materials Literature
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Multi-ion-beam reactive sputter deposition of ferroelectric Pb(Zr,Ti)O3 thin films
A multi-ion-beam reactive sputter (MIBERS) deposition technique was devised to grow ferroelectric lead zirconate titanate (PZT) thin films of different compositions (Zr/Ti ratios of 50/50 and 56/44) from individual metal targets of Pb, Zr, and Ti. This technique offers a highly controllable deposition process allowing…
Winter Annual Meeting of ASME
Computational simulation procedures are used to identify the key deformation mechanisms for (0)(sub 8) and (90)(sub 8) SiC/Ti-15 metal matrix composites. The computational simulation procedures employed consist of a three-dimensional finite-element analysis and a micromechanics based computer code METCAN. The interpha…
Formation of wavy-line texture of zinc ferrite by solid-state reaction
A characteristic wavy-line texture of zinc ferrite (ZnFe2O4) has been formed on the surface of Fe2O3 particles by solid-state reaction between α-Fe2O3 and ZnO particles. The wavy lines were confirmed as having the ferrite composition. The texture was formed by an initial rapid interface reaction followed by the wideni…
Photocurrent imaging of passive metals
The theory of photoelectrochemical imaging using a scanning laser microscope is presented in outline: the idea of a photocurrent transfer function whose parameters might be spatially variable is introduced and a distinction is made between continuous-scan and step-scan methods of rastering the light spot. In the conti…
Quality and Reliability Issues in Materials Databases: ASTM Committee E 49.05
Recent action by ASTM Committee E 49.05 has renewed progress in addressing quality and reliability issues for materials databases. Three major thrusts, the development of a guide for the development and management of materials databases, standardization of specific quality indicators for data and databases, and standa…
Fracture Resistance of a Pressure Vessel Steel Under Impact Loading Conditions
Impact experiments were performed with Charpy specimens and with large bend specimens made from a ferritic pressure vessel steel. All specimens were side-grooved and fatigue-precracked. Different amounts of ductile crack extension up to 16 mm were achieved by varying the available impact energy. The measured hammer lo…
Equilibrium boundary between kaolinite and pyrophyllite
Hydrothermal experiments have been carried out to find the equilibrium conditions for the reactions: 2kaolinite = pyrophyllite + 2diaspore + 2water (1) kaolinite + 2quartz = pyrophyllite + water (2) As starting materials, a natural mixture of kaolinite-pyrophyllite-boehmite was used for the experiments. Determination…
Radiation Damage Studies of the 10 to 13% Chromium-Containing Steels and Alloys Irradiated with Heavy Ions
The 10 to 13 wt% Cr-containing ferritic and ferrito-martensitic stainless steels are seen as promising reactor core structural materials for fast breeder reactors and first wall materials for fusion reactors. The studies involved diffraction electron microscopy and X-ray microanalysis on the 10 to 13 wt% Cr-containing…
Temperature dependence of band gaps in Si and Ge in the quasi‐ion model
Abstract We have calculated the temperature dependence of the direct and indirect band gaps in silicon and germanium. The electron‐phonon potential as well as the phonon frequencies and eigenvectors are calculated consistently within the rigid quasi‐ion model. Comparison is made with experiment and with the theoretica…
Hollow cathode Penning SPS with anode H− production
We fabricate a new small hollow−cathode Penning SPS with a multiaperture extraction for the anode N1 production study. It was found, that the anode surface conversion of superthermal and fast hydrogen atoms into H− ions is effectively realized in the Penning SPS in the case of an increased, cesiated anode surface. (AI…
Pyrolysis of metalloporphyrins. Part 1.—Fourier-transform infrared study of Fe-tetraphenylporphyrin chloride
The pyrolysis of Fe-tetraphenylporphyrin chloride (FeCITPP) has been examined by FTIR spectroscopy. Two series of samples, with and without additional carbon black, were studied. It was found that the decomposition of FeCITPP occurred in a very narrow range of temperature. The mixture of FeCITPP and carbon decomposed…
Effect of condensed‐phase and gas‐phase flame retardants on the ignition behaviour of cotton fabric
Abstract The purpose of this study is to evaluate the effect of some well‐known flame retardants on the ignition behaviour of cotton fabric. Two types of flame retardants acting in different phases (e.g. condensed phase and gas phase) were used. At low add‐on of the retardant acting in the condensed phase the ignition…
Electrical breakdown and space‐charge effect in polyphenylene sulfide films
Abstract Electrical breakdown of polyphenylene sulfide (PPS) films, one of the high‐temperature engineering plastics, has been investigated. The results show that the dc breakdown strength is lower than the impulse one, and that the difference in electric strength between dc and impulse becomes wider as the sample thi…
Study on the Phase equilibrium in the Systems Sodium Selenate — Cadmium Selenate — Water and Sodium Selenate — Manganese Selenate — Water at 25 °C
Abstract The phase equilibrium in the systems Na 2 SeO 4 CdSeO 4 H 2 O and Na 2 SeO 4 MnSeO 4 H 2 O were studied and it was established that new phases were obtained — double salts with a composition: Na 2 Cd(SeO 4 ) 2 · 2 H 2 O and Na 2 Mn(SeO 4 ) 2 · 2 H 2 O. The fields of phase equilibrium of the double salts i…
A porphyrin bearing tetrahydrothiophene pickets; co-ordination behaviour and electron transfer
A novel ‘picket-fence’ porphyrin, 5,10,15,20-tetrakis[o-(tetrahydro-2-thenoylamino)phenyl]porphyrin (H2L) with ligating tetrahydrothiophene rings disposed perpendicular to the porphyrin plane has been synthesised. Its zinc(II) derivative, [ZnL], binds two silver(I) ions co-operatively with a dissociation constant of 4…
Polymers as wide band-gap insulators
In this chapter we introduce the basic electrical terminology and account for the wide variation of observed electrical conductivities and charge transport processes. Our treatment is introductory and necessarily simplified; the reader is referred to more advanced texts during the discussion.
Characteristics of inorganic colloids
Abstract
Electronic states of tellurium in 3d-transition-metal ditellurides
The isomer shift S and quadrupole splitting \ensuremath{\Delta} of the 35.5-keV $^{125}\mathrm{Te}$ level in M${\mathrm{Te}}_{2}$ (M=Ti, V, Cr, Fe, Co, and Ni) were measured at 80 K. M${\mathrm{Te}}_{2}$ with pyrite- and marcasite-type structures exhibit a linear relationship between S and \ensuremath{\Delta}, while t…
Reduction of [Fe III (tfpp)Cl][tfpp = 5,10,15,20-tetrakis(pentafluorophenyl)porphyrinate] by azaferrocene. The crystal structure of [Fe II (tfpp){Fe(C5H5)(C4H4N)}2]
Azaferrocene reacts with chloro[5,10,15,20-tetrakis(pentafluorophenyl)porphyrinato]iron(III) to give a low-spin iron(II) porphyrin, [FeII(tfpp){Fe(C5H5)(C4H4N)}2], the crystal and molecular structure of which has been determined; while air-stable in the solid state, in solution it loses co-ordinated azaferrocene and (…