Materials Literature
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Solid films composed principally of carbon and nitrogen were grown on a variety of substrates at ambient temperature in a flow-tube reactor by upstream mixing of cyanogen azide, cyanogen, or cyanogen halides with active nitrogen obtained from an electrical discharge. Ab initio calculations and dependence of deposition…
In this work, the efficiency of starch acetylation to reduce water sensitivity of hydrophilic materials was investigated. Starch acetate was either included in foamed starch trays and/or used to coat these trays, wheat gluten based films or paper sheets. The water sensitivity of these foamed trays (quantity and kineti…
Die ternären Bismut(II)-chalkogenometallate(III) Bi2M4X8 mit M = Al, Ga und X = S, Se wurden aus den binären Chalkogeniden M2X3 und Bi2X3 sowie elementarem Bismut synthetisiert. Alle Verbindungen sind diamagnetische Halbleiter mit Eg (opt.) = 1.8–2.7 eV. Sie sind bis auf Bi2Al4Se8 thermodynamisch stabil und zerfallen…
Synthetic, structural and luminescence studies of stoichiometric crown ether compounds of Mn(2+) in well-defined coordination environments were undertaken in an effort to understand the origin of emitting crystal defects found in cubic F23 [(K18C6)(4)MnBr(4)][TlBr(4)](2) crystals (Fender, N. S.; et al. Inorg. Chem. 19…
Ceramic joining has been recognized as one of the enabling technologies for the successful utilization of ceramic components in a number of demanding, high temperature applications. Various joint design philosophies and design issues have been discussed along with an affordable, robust ceramic joining technology (ARCJ…
Variable-angle spectroscopic ellipsometry was used to determine nondestructively the porosity depth profile and thickness of thin porous silicon layers produced by anodization of p(+)-doped silicon wafers. A porosity graded-layer model is presented and used in the analysis of the material. In the porosity graded-layer…
This paper reviews the work performed by the authors on the preparation of LnTO3 (Ln = rare earth elements, and T = transition metals) perovskite-type oxides by the thermal decomposition at low temperatures of the corresponding heteronuclear complexes. Bimetallic complexes in the series Ln[Fe(CN6)]·nH2O and Ln[Co(CN6)…
Single crystals of CuTh(2)Te(6) form by a stoichiometric reaction of the elements at 1000 degrees C. The compound crystallizes in the space group -P2(1)/m with unit cell parameters a = 6.170(2) Å, b = 4.332(1) Å, c = 10.424(3) Å, beta = 98.85(1) degrees, and Z = 1 at 113 K. The structure was solved from single-crystal…
Hydrogen embrittlement (HE) of grade 2 and grade 3 titanium was investigated in 6% sodium chloride (NaCl) at pH 1 under potential control at 70°C. Grade 2 titanium was, at most, slightly susceptible to HE under the test conditions, whereas grade 3 titanium was very susceptible at an electrochemical potential below −80…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDifferential Binding of Iron(III) and Zinc(II) Protoporphyrin IX to Synthetic Four-Helix BundlesR. Eryl Sharp, James R. Diers, David F. Bocian, and P. Leslie DuttonView Author Information The Johnson Research Foundation Department of Biochemistry and Biophysics Univers…
Structural (x-ray and neutron diffraction), Mössbauer, and magnetic investigations were performed in order to study Mn, Co, and Ni substituted Fe3.34Ge2 hexagonal germanides. From an x-ray diffraction analysis of Fe3.34Ge2 single crystal data Fe was found to enter exclusively 2a and 2d sites of the defective structure…
Etch rates ⩾5000 Å min −1 were obtained for Cu in electron cyclotron resonance discharges at a sample temperature of 200°C for ion‐neutral ratios ⩾0.02. The rates are a strong function of ion‐neutral ratio, ion flux, and ion energy through the need to have desorption rate faster than the , generation rate in order to…
A new mechanism was found to alleviate the thermally induced phase mismatch of nonlinear optical crystals. By cooling CsLiB>(6)O(10) at an elevated crystal temperature with gas, we improved laser conversion efficiency from green (532 nm) to UV (266 nm) 2.3 times compared with that without cooling. In situ observation…
Recently by dielectric spectroscopy a new secondary relaxation process in polyisobutylene (PIB) was detected showing all the signatures of a Johari-Goldstein relaxation [Richter, D; Arbe, A.; Colmenero, J.; Monkenbusch, M.; Farago, B.; Faust, R. Macromolecules 1998, 31, 1133]. Using high resolution neutron backscatter…
The combustion performance of polyphenylene oxide (PPO), high impact polystyrene (HIPS), or PPO/HIPS blend fire retarded by resorcinol bis(di phenyl phosphate) (RDP) was studied by OI and UL94 tests. RDP is an efficient fire retardant additive in PPO/HIPS because of its very high efficacy in PPO. In HIPS, RDP shows mo…
Abstract The crystalline structure formation in the heat affected zone during hot plate welding has a great influence on the performance of the welded semi‐crystalline polymers. The quiescent and flow induced crystallization of polypropylene was investigated experimentally. A simplified, phenomenological crystallizati…
An effective tunneling Hamiltonian including spin-flip effect is proposed to account for the tunneling magnetoresistance (TMR) in mixed-valence manganite tunnel junctions and the current-perpendicular-to-plane TMR in layered manganite crystals. It is found that the electron spin-flip tunneling plays an important role…
This comparative study addresses the influence of microstructural evolution on mechanical properties of porous alumina prepared by partial densification with and without addition of a glassy phase. The composition used for liquid‐phase sintering is heated above and, in order to freeze the starting defect distribution,…
By using the gas-evaporation technique with an induction heating method, Zn nanoparticles coated with ZnO were prepared in Ar. The Raman spectra of the Zn/ZnO nanoparticles were studied over a wide range from room temperature through liquid nitrogen temperature and up to 873 K. With heating in air, the transformations…
The polarization reversal/switching process was investigated in normal and relaxor ferroelectrics and described as a result of field-induced evolution of domain/heterophase structure. Hysteresis loops and elastic light scattering data recorded under the action of field pulses were measured. The development of a hetero…