Materials Literature
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Diamond films are synthesized by arc discharge plasma jet chemical vapor deposition in the methane atmosphere. The apparatus developed generates a stabilized plasma jet continuously for more than 12h. The plasma jet consists of hydrogen and argon. is used as an atmospheric gas and is mixed into the plasma jet. The pla…
This review volume contains articles on the recent developments, new ideas, as well as controversial issues dealing with the general phenomena of hopping transport in disordered systems. Examples of hopping systems of current interest are polymers and biological materials, mesoscopic systems, two- and one-dimensional…
Both doped and undoped homoepitaxial diamond films were fabricated using microwave plasma-enhanced chemical vapor deposition (CVD). The conductivity of the diamond film is strongly affected by the surface treatment. In particular, exposure of film surface to a hydrogen plasma results in the formation of a conductive l…
Abstract The presence of non-crystallographic symmetry in crystals affects the intensity distribution as well as cumulative distribution function N ( z ), which has been derived for cases of many parallel repetitions of atoms at random using the series expansion distribution function. It is seen that the change in the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal polarized spectra in the near-infrared region: a local-mode analysis of the spectra of barium chloride dihydratePaul J. McCarthy and Ian M. WalkerCite this: Inorg. Chem. 1990, 29, 4, 820–824Publication Date (Print):February 1, 1990Publication History Published…
The temperature dependences of the dielectric properties at different fixed pressures, and the antiferroelectric phase transitions of squaric acid ${\mathrm{H}}_{2}$${\mathrm{C}}_{4}$${\mathrm{O}}_{4}$ and its deuterated form ${\mathrm{D}}_{2}$${\mathrm{C}}_{4}$${\mathrm{O}}_{4}$ have been investigated. Using the four…
The intensity of beam current through a specimen film changes as a function of the temperature due to the thermal diffuse scattering. This feature is applied to temperature measurement. The measuring region is restricted to a small area of about 1 μm in diameter by the method of selected area diffraction. As the beam…
A chemical method for preparing CuI thin films by iodination of solution grown Cu 2 S films is described. X-ray characterization identifies γ-CuI and suggest that the films are polycrystalline in nature. SEM reveals a granular film morphology. Optical studies show that the band gap of the material is 2.93 eV. The shee…
Abstract The crystal structure of barite: β -BaSO 4 (orthorhombic, Pnma , Z = 4, D x = 4.48 g/cm 3 at 25°C, μ = 120 cm −1 at 25°C, β → α transition temperature 1090°C) has been studied with single crystal X-ray diffraction methods at temperatures up to 1035°C. The a -axis keeps expanding at elevated temperatures, whil…
The inhibition of aluminium corrosion in solutions of hydrochloric acid or sodium hydroxide has been studied using weight-loss and hydrogen evolution methods. Benzoic acid and its derivatives inhibit acidic and alkaline corrosion effectively. The efficiency of inhibitors increases in the order: benzamide < benz…
In order to determine whether or not starting a test in ramp loading has an effect on the fatigue mechanism when the test is continued in constant stress or strain, polycrystalline copper specimens have been cycled to failure in load or strain control, with and without initial ramp loading. The failure mechanisms were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion motions and microphase separation of styrene-butadiene diblock copolymer in solution. 1. Extremely dilute solution regionYoshisuke Tsunashima, Masukazu Hirata, and Yukinao KawamataCite this: Macromolecules 1990, 23, 4, 1089–1096Publication Date (Print):February 1,…
Abstract Glauconites in early ankerite concretions, ferroan calcite-cemented sandstones, and uncemented sandstones in the first Wilcox sandstone of the Lockhart Crossing field, Livingston Parish, Louisiana, show a progressive substitution of Fe for octahedral Al with increasing diagenesis. An octahedral Fe content of…
PBI (polybenzimidazole) is a thermally stable high performace polymer. In a variety of forms, e.g. fibers, neat resin and composites, PBI finds use in a wide range of high temperature applications. The synthesis of PBI, and properties, and applications of fiber and molded resin are discussed. Also included are recent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of mesophase transitions in thermotropic copolyesters. 3. Poly[(phenyl-p-phenylene terephthalate)-co-[(1-phenylethyl)-p-phenylene terephthalate]] copolyesterStephen Z. D. Cheng, Anqiu Zhang, Ronald L. Johnson, Zongquan Wu, and Hak Hung WuCite this: Macromolecules 19…
Abstract CaCu 2 As 2 (I4/mmm, a = 412,9(1) pm, c = 1 025,1(1) pm, Z = 2) kristallisiert im ThCr 2 Si 2 ‐Typ, die Cu‐Punktlage ist wie bei dem isotypen Phosphid unterbesetzt. Die Struktur von Ca 2 Cu 6 P 5 (I4/mmm, a = 410,5(1) pm, c = 2 465,7(2) pm, Z = 2) besteht aus drei übereinander gestapelten Blöcken des ThCr 2 S…
The square‐pyramidal structure is one reason for the intense color of pen‐taphenylbismuth and many of its derivatives, such as 1 . The easy electronic excitation is made possible, in this case, by a low‐lying LUMO, which is oriented toward the sixth coordination site of the octahedron. Noteworthy are the lack of shiel…
Polyphenylacetylene (PPA) is a variant of polymeric polyacetylene. Unlike polyacetylene, it is stable in air, which makes it easier to handle and investigate. Numerous studies have been conducted on this material. Syntheses have been made by different routes. Many catalysts have been used to achieve the polymerization…
Bismuth oxide has been found to be a useful flux for the preparation of dense body cordierite (Mg 2 Al 4 Si 5 O 18 ). The addition of as little as 2 at.% of bismuth ion to the appropriate stoichiometric mix of commercially available oxide starting materials gives fully dense cordierite after firing for 12 h at 1000°C.…
In this paper we have studied the atomic structures of (111) twist boundaries and investigated the applicability of the structural unit model which has previously been established for tilt boundaries and (001) twist boundaries by Sutton and Vitek. The calculations were carried out using two different descriptions of i…