Materials Literature
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In a flux-grown SrTiO3 crystal, monodomain and polydomain regions have been observed below the transition temperature without applying external stress. For each region, measurements of the lattice constant as a function of temperature are made by means of high-angle double-crystal X-ray diffractometry (HADOX) with a p…
Since the Curie temperature (Tc) of R-Fe-B permanent magnets is lower than conventional 1/5 and 2/17 magnets, the irreversible loss due to the change of coercivity is critical when considering their application. The simple way to guarantee the thermal properties is to raise the coercivity at room temperature. The effe…
Thermal expansion was measured for skull‐melt‐grown undoped single‐crystal zirconia as well as for crystals containing 2.8 wt% MgO, 4 wt% CaO, and 3 to 20 wt% Y 2 O 3 . Samples were cycled in air from room temperature to 1500°C. The partially stabilized samples experienced a phase transformation which was strongly dep…
A technique is described to join Si 3 N 4 ceramics using oxide glasses. The technique involves a glazing step, followed by a pressureless reaction treatment of 30 to 60 min at 1575° to 1650°C. Reactions between the glasses and Si3N4 are reported. Important events are dissolution of Si 3 N 4 and the growth of Si 2 N 2…
A method for measuring assimilation efficiencies based on the change in the Si : 14 C ratio in food and feces is proposed. Since this indicator method uses biogenic silica as the inert substance, the method is restricted to aquatic herbivores that consume food containing it. The method has been demonstrated on adult f…
The development of amorphous TbFeCo alloy films is summarized and from the dynamic read/write characteristics, TbFeCo films are confirmed to be very useful for digital memory applications. That is, the value of C/N is more than 50 dB and life times of more than 5 years were obtained even in the case of a PMMA substrat…
The decomposition of trimethylaluminum (TMA) on copper, aluminum, quartz, and gallium arsenide substrates has been studied as a function of substrate temperature from 550–900 K under low pressure conditions. Detection of gaseous products was carried out by laser multiphoton ionization mass spectrometry (MPI/MS) for me…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformation, bonding, and flexibility in short-chain linear phosphazenesHarry R. Allcock, Norris M. Tollefson, Robert A. Arcus, and Robert R. WhittleCite this: J. Am. Chem. Soc. 1985, 107, 18, 5166–5177Publication Date (Print):September 1, 1985Publication History Published…
Abstract The diffusion of organic solvents in concentrated polymer solutions often deviates from the predictions of Fick's second law, especially when the solution is in the glassy state; such behavior is called anomalous or non‐Fickian. This paper analyzes the one‐dimensional sorption of a solvent into a concentrated…
The molybdenum bronzes A0·30MoO3, A0·9Mo6O17 and Mo4O11 oxides all show low-dimensional electronic properties, due to anisotropic crystal structures, which lead to charge-density-wave (CDW) instabilities. In the CDW states of the quasi-one-dimensional blue bronzes, non-linear transport properties are attributed to the…
The response of a material under uniaxial compression depends both on the bulk material properties and on the frictional effects at the sample‐platen interface. Three commercial cheeses (cheddar, mozzarella and processed cheese spread) were studied in uniaxial compression. Frictional effects at the sample surface were…
The enhancement of electromagnetic processes on metallic surfaces is discussed in view of applications in surface photochemistry and surface analytics. The strongest enhancements are found on substrates that consist of discrete metal particles. A theoretical description for plasmon resonances of such particles is deve…
The compositions of air-formed passive films on ferritic stainless steel (SS) were modified by exposure in solutions containing CrO-2, MoO4-2, and WO4-2 ions. The steel samples prepared in this manner were investigated for their pitting resistance in 3% NaCl by measuring the pitting nucleation potential. Auger electro…
Abstract Chemical analyses for ganomalite from Franklin, New Jersey, and Jakobsberg, Nordmark, Sweden, imply that Mn is an essential element and that the formula is Pb 9 Ca 5 MnSi 9 O 33 , with Z = 1 for the hexagonal unit cell. Preliminary crystal structure data confirm that Mn and Ca are ordered, as implied by the c…
Germanium and phosphorus diffusion were studied in binary GeO 2 ‐SiO 2 and P 2 O 5 ‐SiO 2 core light guides. Variations in composition profile shape with heat treatment were measured by an energy‐dispersive X‐ray analysis method. These data were fitted to a solution of Fick's second law to obtain diffusion data. No ch…
On the basis of a statistical theory of losses recently developed by the author, the excess dynamic loss of polycrystalline soft materials is expressed directly in terms of the hysteresis loss and the average grain size, with no adjustable parameters. The obtained loss equation correctly predicts both the absolute val…
Two basic models of the incommensurate (IC) structure of NaNO2, one with purely occupational modulation and one with mixed modulation, have been tested using (3 + 1)-dimensional space groups. The refinements were performed in the two superspace groups PI m_{\bar 1} ms m1 and PI 2s ms m1. The main feature of this IC st…
Some computed results of an energy method of analysis applied to single bar warp knitted structures (Part I) are presented. They are compared with experimental results and previous models of the warp knit structures in the literature. The single bar warp knit structures are characterized by a complex interlacing patte…
Abstract Polyacetylene (PA) deposited on a platinum surface is synthesized by electrochemical polymerization of acetylene in a cell with platinum strip as cathode, nickel strip as anode, and nickel bromide in acetonitrile as electrolyte. The electrolytic solution is presaturated with acetylene. The PA so produced has…
Low-energy electron energy loss spectra including secondary electron bands and low-energy electron transmission spectra were measured for polystyrene and poly(2-vinylpyridine) thin films deposited on metal substrates. Almost all the features of these spectra could be explained as the result of electronic excitations l…