Materials Literature
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Containerless undercooling in an electromagnetic levitation device was used to observe solidification velocities as a function of undercooling temperature for pure Ni and Cu-Ni alloys. In a limited temperature range, the results can be interpreted using current theories, provided the conditions for local equilibrium a…
A new type of halide glasses, based on coordination compounds of the chlorides, bromides and heavy metals have been proposed. The formation of the halide glasses and their property will be discussed on the basis of suggested sheme of cluster compound formation. The paper also deals with the fabrication of silver and t…
Scanning Deep Level Transient Spectroscopy (SDLTS) is a current SEM technique for the detection of the local distribution of deep level centres in semiconductors. The contribution deals with the physical foundations of the SDLTS technique and it discusses the demands on the instrumentation. The measurement practice is…
To date it has been difficult to identify active material originating from the oxidation products of cladding alloys in the cooling circuits of power reactors. In an attempt to solve this problem, a sample of cladding oxide was characterized fully using secondary ion mass spectrometry (SIMS), exploiting the high sensi…
The phase diagram of the system Na2S04-Na2C03 has been determined from room temperature upto liquidus. At low temperature the system shows partial miscibility and the formation of a compound, burkeite. At high temperature, the whole system shows complete miscibility and crystalizes in hexagonal system, with P63/m mc s…
The paper gives the reasons for the development of a gold alloy of 990 fineness with good colour, durability, and mechanical properties, and explains why titanium was chosen as the alloying metal. Methods are descriptionbed for the alloy's production, solutionizing, and age-hardening. Mechanical properties are given a…
Abstract Divalent metal terephthalates such as the zinc, calcium, barium, and cadmium salts appear, from their properties, to be polymeric. As a result, exceptionally high decomposition temperatures and unusually low solubilities are found. Although not in themselves vinyl heat stabilizers, in concert with typical mix…
Abstract Diantipyrylmethane and tiron spectrophotometric determinations of Ti in the super alloys, Inconel 718 and Inconel 600, have been studied thoroughly. Both reagents formed stable yellow complexes with Ti(IV) in acidic medium. The possible interference from Ni, Fe and Cr was examined. Interference from Fe(III) w…
We formulate a continuous-time random-walk model for the motion of conducting ions in \ensuremath{\beta}-alumina which accounts for correlation effects as well as free and jump diffusion mechanisms in a unified way. The calculated frequency-dependent conductivity and incoherent intermediate scattering function agree w…
The crystal structures of RbMnCl3 and RbMnBr3 were determined to be hexagonal P63/mmc. The differences between these two structures are that in RbMnCiJ there are six close-packed layers while there are two close-packed layers in RbMnBr3. Moreover, in the latter structure the Mn-Br octahedra share opposite faces to for…
Mn 5 (H 2 O) 8 (AsO 3 OH) 2 (AsO 4 ) 2 .2H 2 O cristallise dans P1 avec affinement jusqu'a 0,028. La structure consiste en un nombre egal d'ions AsO 4 et AsO 3 OH ayant des sommets communs avec des octaedres centres sur les atomes Mn
The structure and properties of air textured yarns are influenced by the dynamic friction of the parent filament yam. We have demonstrated this by texturing under various conditions two similar multifilament yarns with different spin finishes. We have analyzed the effects of water and mechanical stretch on the structu…
Abstract Within the framework of the Peierls model an integral equation for the dislocation density distribution of 〈111〉 screw dislocations with threefold symmetry in b.c.c. crystals is derived. The dislocation core, described by a density of infinitesimal Burgers vectors, is extended along three {110} half‐planes in…
From the rhizomes of HYPOXIS OBTUSA two monoglucosides having the same aglycone as hypoxoside, 1-(3',4'- dihydroxyphenyl)-5-(3'',4''-dihydroxyphenyl)-1-pen-ten-4-yne, have been obtained. By methylation followed by hydrogenation they have been transformed into the same compound, 1-(3'-methoxy-4'- O-beta- D-glucopyranos…
Abstract The Raman spectrum of sulphonated copper phthalocyanine on a silver electrode surface is reported for four excitation wavelengths in the Q ‐band region at voltages between +0.6 and −0.6 V (vs SCE). SERS activity is observed and the bonding and orientation of the surface species are voltage dependent and are i…
Abstract Polyamic acid films interact as ion‐exchange substrates for dilute aqueous cation solutions. Three conditions were evaluated: basic solutions which form soluble amic acid salts and dissolve the film, weakly acidic solutions which encourage classical weak acid cation exchange, and strongly acidic solutions whi…
Abstract The mathematical relationships are developed which are pertinent to the quantitative analysis of powder mixtures for the case of diffraction from the surface of a flat powder specimen. These formulas relate the diffracted intensity to the absorptive properties of the sample. Three important cases are treated:…
We report on the response of three scientific charge-coupled devices (CCD), the RCA SID501, the Tektronix TK512M, and the Texas Instruments 4849, to direct electron bombardment. A scanning electron microscope is used to provide a temporally gated, focused electron source of precise energy and current. Both the detecti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSkeletally stabilized triphosphazanes: new classes of linear phosphazanesJoseph M. Barendt, Elizabeth G. Bent, R. Curtis Haltiwanger, and Arlan D. NormanCite this: Inorg. Chem. 1989, 28, 12, 2334–2339Publication Date (Print):June 1, 1989Publication History Published online1…
CuMg 1,425 Cr 0,611 Si 1,964 O 6 cristallise dans P2 1 /c avec affinement jusqu'a 0,032, la structure etant similaire a celle du mineral clinoenstatite