Materials Literature
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Abstract Cadmium Selenide (CdSe) thin films were prepared in different growth conditions by thermal evaporation. The films were characterised using transmission electron microscopy and X‐ray diffraction. The electrical parameters such as resistivity, carrier mobility, and concentration were determined. The sensitivity…
We demonstrate here the direct observation of the side view of surface folds in a swelling gel, which are induced by elastic instability. The fold structure along the thickness direction has been clarified, which is a prerequisite for understanding its singular nature. The elementary coarsening process of the fold pat…
The crystal of p-fluorophenyl nitronyl nitroxide [2-(4-fluorophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl 3-oxide, abbreviated as p-FPNN] radical has been found to possess a dimeric structure. Each dimer is related to adjacent ones by four-fold screw symmetry to form a three-dimensional network. The temp…
CuO/Al2O3 catalysts have been sulfated by oxidation of various amounts of SO2. The surface properties of the samples were studied using probe molecules. The IR spectra of CO species adsorbed on the non-sulfated sample show an strong band at 2125 cm–1 with a shoulder at 2160 cm–1, which shift to 2165 and 2180 cm–1, res…
A two-dimensional analysis of the in-plane misfit stress and its elastic relaxation in rectangular patterned heteroepitaxial SiGe/Si multilayer structures on Si substrate is presented. Based on the model of relaxing film stress the distribution of the misfit stress versus distance from the free surface of a multilayer…
Abstract 2‐(4′‐Hydroxyphenylbenzoyl)benzoic acid is readily available from phenolphthalein by reaction with hydroxylamine. On treatment with hydrazine, 4‐(4‐hydroxyphenyl)phthalazin‐1‐one is formed in high yield. Under conditions conventionally used for the synthesis of poly(aryl ether)s the phthalazinone reacts with…
The complex polymer [{Cu2L(pyca)(H2O}n][ClO4]n·2nH2O [H2L =N, N′-bis(2-ammoethyl)oxamide. Hpyca = pyridine-4-carboxylic acid] has been prepared and its magnetic properties and crystal structure determined. The crystals are monoclinic, space group P21/c, with 3 = 10.420(2), b= 13.118(2), c= 14.863(5)Å;, β= 93.05(2)°, a…
Diffusible hydrogen behavior in pre-strained high strength steel was investigated by use of a newly developed hydrogen content determining method for better understanding of delayed fracture.Pre-straining up to 4.2% formed a new hydrogen trapping site in the steel. When hydrogenerated in a 0.1N HCl solution, hydrogen…
The formation of h-BN by thermal decomposition of melamine diborate was examined by XRD, IR and thermal analysis. The melamine diborate, which was precipitated as white powders by cooling a hot solution of melamine and boric acid, was presumed to have a monoclinic structure with a=2.0259nm, b=1.4180nm, c=0.3504nm, β=9…
We establish the existence of isolated local minimisers to the problem of partitioning certain two-dimensional domains into three subdomains having least interfacial area. The solution we exhibit has the special property that the three boundaries of the minimising partition meet at a common point or “triple junction”.…
An ion-exchangeable layered perovskite compound, Na2La2Ti3O10, was directly synthesized by a solid-state reaction. The crystal structure of Na2La2Ti3O10 was determined by electron diffraction analysis and Rietveld analysis for the powder X-ray diffraction pattern. The unit cell is tetragonal with a=0.383528 (7) nm, c=…
In this report, controls of polymorphism and morphology of calcium carbonate compounds were studied by suspending amorphous calcium carbonate hydrate (ACC) powder in water or MgCl2 solution. Characteristics of calcium carbonate compounds formed from ACC were determined by means of X-ray diffraction, thermal analysis (…
The complexes [LnL2(NO3)2]NO3·nMeOH [L = 2,6-bis(benzimidazoi-2-yl)pyridme, Ln = Ce 1, n= 3; Ln = Eu 3 or Tb 4, n= 2] have been characterized by single-crystal X-ray diffraction, IR and 1H NMR spectroscopy and molar conductivity. They are ten-co-ordinate with six nitrogen atoms from two tridentate L ligands and four o…
Samples of Pt-10% Ir have been studied by X-ray photoelectron spectroscopy (XPS) to assess environmental contamination of reference kilogram masses. Samples were sputtered clean and distributed to four places where reference kilograms are kept at the NPL. All four specimens showed carbon and oxygen contamination which…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton diffusion in the pores of silicate sol-gel glassesJohn McKiernan, Eric Simoni, Bruce Dunn, and Jeffrey I. ZinkCite this: J. Phys. Chem. 1994, 98, 3, 1006–1009Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 Janu…
This evaluation of techniques, apparatus, and dedicated facilities for measurement of very low levels of radioactivity is addressed to the large community of researchers who use radioactive tracers, make activation analyses, etc. and may occasionally face the problem of measuring an activity well below the level acces…
have been synthesized and their molecular structures have been also determined by single-crystal X-ray diffraction technique. The space groups, unit cell parameters, and R factors are as follows: Compound A, monoclinic, , a= 19.074 (3), b=21.490 (3), c=15.183 (2) =109.67 (1) ; z=8; R=0.075($IF_0I>4{\sigma}(IF_0I);$ Co…
The detection of surface stress in materials is becoming increasingly important in failure analysis. In the case of ferromagnetic steels, the Barkhausen effect provides a practical tool for surface stress evaluation. However, one of the drawbacks of the method has been the lack of an underlying model theory for use in…
Abstract Highly branched polyphenylenes, polyphenylene ethers, aromatic polyesters and polyamides synthesized from AB 2 type monomers are reviewed. Polyphenylenes were obtained by aryl‐aryl coupling reactions of 3,5‐dihalo‐phenyl organometallic reagents. 13 C NMR indicates about 70% branching efficiency. A T g at 236°…
Abstract Infrared and single crystal Raman spectra for various polarization geometries of Triglycine Sulpho‐Phosphate (TGSP) have been recorded and analysed. The bonds of hydrogen atoms in H 2 SO 4 and H 3 PO 4 groups are shown to be weak and the possibility of proton transfer from H 2 SO 4 /H 3 PO 4 group is indicate…