Materials Literature
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Article Veränderungen in Eigenschaften und Bruchverhalten von Wolfram- Schwermetallen während der Flüssigphasensinterung was published on March 1, 1983 in the journal International Journal of Materials Research (volume 74, issue 3).
Abstract Photocrosslinkable polymer is prepared from amorphous poly(methyl vinyl ketone) (A‐PMVK) obtained by anionic polymerization of methyl vinyl ketone. The reaction of A‐PMVK with cinnamoyl chloride proceeds in pyridine at 50°C. The photosensitivity of the polymer obtained is measured by infrared and Ultraviolet…
Abstract Energy transfer between fluorescent organic pigments (fluorophors) dispersed in a paint vehicle was studied for mixtures of a yellow, a red, and an orange fluorescent pigment, and for mixtures of these with titanium dioxide. Radiative energy transfer occurs among the fluorophors, but not between them and tita…
Abstract We have found that silicone rubber compounds undergo a reduction in effective chain concentration when heated in an environment of high temperature silicone oil and that this rate of reduction is dependent upon the effective chain concentration to the 3/2 power. The 3/2 power relationship results from a slowe…
Summary A high‐resolution 500 kV study of the long‐period ( n = 8) perovskite Bi 9 Ti 3 Fe 5 O 27 has revealed a variety of order/disorder effects, in marked contrast to low‐ n materials, as well as the occurrence of a new two‐dimensional superlattice structure corresponding to a 3 × d 110 ordering along the bismuthat…
The sulfate heptahydrates $M\mathrm{S}{\mathrm{O}}_{4}\ifmmode\cdot\else\textperiodcentered\fi{}7{\mathrm{H}}_{2}\mathrm{O}$ crystallize in two different structures: the monoclinic melanterite ($M=\mathrm{F}\mathrm{e},\mathrm{C}\mathrm{o},\mathrm{C}\mathrm{u},\mathrm{C}\mathrm{r}$) and the orthorhombic epsomite ($M=\m…
An optical fiber operating in the mid-infrared wavelength range is fabricated using ZrF4-based fluoride glass. Material purification, the fiber fabrication process, and transmission properties are presented. The starting materials, ZrF4, BaF2, GdF3, AlF3, and SbF3are carefully purified by sublimation techniques. The "…
The Bi–In system has been redetermined mainly using thermal analysis, but supplemented as appropriate by metallographic and X-ray examination. It is confirmed that the system contains four compounds: BiIn, Bi3In5, BiIn2, and an ɛ phase at approximately 90 at.-%In. Bi and BiIn form a eutectic at 46·8 at.-%In and 109·7°…
Abstract An attempt is made to investigate the effects of varying the orientation of a quantizing magnetic field on the effective mass in tetragonal semiconductors. It is found, taking n‐Cd 3 As 2 as an example, that the crystal‐field splitting results in different effective masses at the Fermi level corresponding to…
Abstract The fluorescent states of tetratolylporphyrin and its zinc complex in acetone were quenched by various kinds of quinones. The transient effect for the collisional quenching caused the upward deviation of the plots of the inversed fluorescence intensities of the porphyrins vs the quinone concentrations. A char…
Results of immersion pitting, immersion crevice, and slow scan potentiodynamic pitting tests are compared to assess the relevance of particular types of accelerated laboratory tests for localized corrosion. The alloys examined include 317 L, 20-type alloys, duplex stainless steels, and nickel-base alloys. The solution…
The synthesis, solubility enhancement, and phase-transfer catalysis properties of cyclic poly(alkyleneoxy)silanes (silacrowns) I [R = R1 = Me; R = Me, R1 = Et, Ph, CH2:CH, MeO, H2NCH2CH2NH(CH2)3; n = 3-6] are described. Solubility enhancements of Li, Na, and K ions are a function of macrocycle and ion size. Phase-tran…
Abstract Weathering products of a serpentinized Iherzolite were investigated using optical microscopy, X-ray diffraction, infrared spectroscopy, and electron microprobe and wet-chemical analysis methods. The original mineral assemblage of the rock was chrysotile-enstatite-diopside-picotite-magnetite-calcite. Rock poro…
Treated cotton batting is examined as a substrate for cotton upholstered furniture. Evaluation of the smoldering hazard includes the tests proposed by UFAC and NBS, together with smoldering rates and surface temperature profiles obtained using the SRRC Rate Chamber. The influence of washing on the smoldering behavior…
CW laser fields are strong enough to induce a large refractive index change in a liquid crystal. Optical-field-induced structural transition can occur. The large optical nonlinearity can lead to some unusual highly nonlinear optical phenomena.
Summary The method of high‐resolution electron microscopy is applied to study the microstructure of the Sm–Ni intermetallic compound whose composition is near the Sm 5 Ni 19 . Several new polytypic structures (5T, 7T, 15R and 18R) are found and their crystal structures are analysed by high‐resolution imaging method co…
Abstract Stress corrosion cracking of poly(vinylidene fluoride) in sodium hydroxide solution is investigated. Poly(vinylidene fluoride) (PVDF) is embrittled in the presence of solutions of sodium hydroxide. Cracks developed in specimens of PVDF subjected to load and solution of NaOH. Reddish‐brown deposits appear befo…
The precipitation of phosphate is an important problem in both scale formation and corrosion inhibition. The formation of zinc phosphate barrier films in the latter case is a well-known technique, but the mechanism of the process is still poorly understood. Calcium phosphate phases which precipitate in solutions conta…
The effect of pressure (up to 80 kbars) on the electrical conductivity of a series of fast-ion conducting AgI–Ag2O–MoO2 glasses has been investigated. The results are consistent with a cluster model.
Abstract The history of important developments in the theory of hybrid bond orbitals and its application in valence‐bond theory is reviewed. One of the salient points, the bond strength of a hybrid orbital, is defined as the value of the angular part of the orbital along the bond direction. Characteristic bond angles…