Materials Literature
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A unified treatment has been constructed which gives a perspective view of incommensurate(IC)-commensurate(C) phase transition schemes in A 2 BX 4 type crystals. We have shown that a microscopic treatment based on `Extended Antiferroelectric Interaction Ising' model can explain most of the observed features of IC-C ph…
Results are presented of a study of physical and optical properties of amorphous hydrogenated carbon films (a-CH x ) prepared by d.c. magnetron glow-discharge decomposition of acetylene in argon, both as prepared and after heat treatment in vacuum. The dependences of density, deposition rate and hardness on the partia…
Abstract Small colloidal particles of ZnS were obtained by precipitation of Zn 2+ with SH − in the presence of colloidal silicon dioxide. Co‐colloids were prepared by simultaneously precipitating ZnS and CdS. Colloidal ZnS fluoresces at 425 nm. 90% of the fluorescence decays within 30 ns. The fluorescence is partly qu…
The natural frequency fn and damping constant δ of a bubble in liquid have been determined by observing the resonance of the bubble to forced oscillation. The bubble was retained under a rigid plate horizontal disk, and the oscillation was applied by underwater speaker. The applied frequency f was kept constant while…
Abstract The Raman spectra of KClO 3 are reported at room temperature up to pressures of 60 kbar in a diamond‐anvil cell. The phase transition between phases I and II occurs at approximately 7 kbar, is sluggish and the spectra show that the two phases coexist over a pressure range of approximately 5 kbar. The Raman sp…
The total cold reduction and reduction per pass used during the drawing of fine wires affected the mechanical properties of two beta-titanium alloys. Both Ti-11.5Mo-6Zr-4.5Sn and Ti-13V-11Cr-3Al showed increased yield strengths and low moduli of elasticity, which resulted in wires appropriate for orthodontic applicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray diffraction analysis of airborne particulates collected by an Andersen sampler. Compound distribution vs. particle sizeTsutomu. Fukasawa, Masaaki. Iwatsuki, and Sujith P. TillekeratneCite this: Environ. Sci. Technol. 1983, 17, 10, 596–602Publication Date (Print):Octobe…
The results of a detailed analysis of the long-term and high-temperature oxidation behaviour of Zircaloy-4 in steam (600-1600 deg. C) may be summarized as follows: During an introductory phase of ''normal'' oxidation up to about 30 min, an adherent oxide layer was formed. More specifically: a cubic rate law governed t…
A Monte Carlo simulation of polymer crystal growth from the melt is presented. This two-dimensional model approximates growth by laying down crystal stems one at a time. The Monte Carlo simulation of various geometric models of the crystal surface yields Regime I and Regime II growth similar to that predicted by Lauri…
Technetium‐99 can be dissolved in Mg 2 TiO 4 spinels to form solid solutions with low dissolution rates. These materials are possible host phases for 9 9Tc in ceramic nuclear waste forms .
The existing theoretical cross section data for the charge exchange process of multiply charged fully stripped ions with hydrogen atoms are evaluated in the energy range from ∼10 eV/u to ∼103 keV/u. The evaluation has been performed on the basis of both pure theoretical arguments and comparison with the most accurate…
Abstract We report a melt spinning and viscosity study of two semiflexible homopolyesters containing both rigid and flexible segments in the repeating unit. Single filaments of the polyesters formed from 4,4′‐diacetoxybiphenyl and azelaic acid (PB7) and sebacic acid (PB8), and from 4′‐hydroxyphenyl‐4‐hydroxycinnamate…
In terms of the Takayama-Lin-Liu-Maki continuum model, exact solution is constructed for a polyacetylene chain on which a soliton and a polaron coexist, using the inverse scattering method. It is found that soliton and polaron can freely pass each other without attractive or repulsive interactions, irrespective of the…
(TTF)3(BF4)2 crystallizes in the triclinic system, space group P1, a = 8.017(3), b = 8.601(1), c = 11.635(2) Å, α = 108.79(1), β = 100.96(2), γ = 99.09(2)°, Z = 1. The TTF entities are stacked in parallel columns arranged into parallel layers alternating with layers of BF4 − anions. A TTF stack is constituted of (TTF+…
Stimulated emission has been achieved in emerald, a chromium doped beryllium aluminium silicate (Be3Al2Si6O18:Cr3+) crystal over a wavelength band peaked at 684.8 nm.
The autoxidation of sulfur dioxide to sulfate in aqueous solution has been examined over the pH range 4-13 in the presence of water-soluble transition metal-4,4’,4”,4”‘-tetrasulfophthaloc anine com lexes, MTSP (where M = Fe^(II), Mn^(II),Co^(II), Ni^(II), Cu^(II), and V^(IV). Experimental rate data have been analyzed…
Photocurrent spectra of the polycrystalline, n-type WO3 film photoanodes are shown to undergo a profound transformation following aging in a photoelectrolysis cell containing an aqueous acidic electrolyte. The observed significant improvement of the photocurrent efficiency of the WO3 photoanodes is assigned to a decre…
Devitrification rates were measured for a series of vitreous silica glasses doped with trace levels of alkali metal oxide (1.6 to 57.8 molar ppm) and aluminum oxide (22 to 73.3 molar ppm). The devitrification rate varies inversely with the molar ratio of aluminum oxide to alkali metal oxide, a direct consequence of th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic susceptibility and EPR study of bis(.beta.-alaninium) tetrabromocuprate(II)Roger D. Willett, Raymond J. Wong, and Michiko NumataCite this: Inorg. Chem. 1983, 22, 22, 3189–3194Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Publi…
Abstract The rheological and thermal properties of composites of polystyrene (PS) and two liquid crystalline low‐molecular‐weight additives have been studied. Both additives act as plasticizers as evidenced by decreases in the glass transition and the melt viscosity. In addition both are miscible with PS over a broad…