Materials Literature
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Phase relations in the BaTiO 3 —TiO 2 system were studied at temperatures above 1300°C in air. Quenching experiments were performed with high‐purity reagents, and a new equilibrium phase diagram was constructed. Results include redetermination of the liquidus boundaries, the eutectic temperature, the melting or decomp…
Trends in recently reported data on high sp3 fraction (up to 85%), nonhydrogenated amorphous diamond-like carbon films deposited by ion beam sputtering and laser vaporization are examined. The degree of diamondlike film character is found to depend upon the deposition technique as well as the substrate temperature and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel template effects of distannoxane catalysts in highly efficient transesterification and esterificationJunzo Otera, Nobuhisa Danoh, and Hitosi NozakiCite this: J. Org. Chem. 1991, 56, 18, 5307–5311Publication Date (Print):August 1, 1991Publication History Published onlin…
Thick (100 μm) chemical vapour deposited (CVD) polycrystalline diamond films have been observed to emit electrons with an intensity sufficient to form an image in the accelerating field of an emission microscope without external excitation (> 3 MV/m). The individual crystallites are of the order of 1–10 μm. The com…
The structural and magnetic properties of BaFe12−2xCoxTixO19 (0≤x≤1.0) M-type barium ferrite have been investigated by means of neutron powder diffraction and high-field magnetization measurements. The cationic distribution and magnetic moments of the five different metallic sublattices are determined and compared to…
In an earlier paper we reported measurements of the activation energy for sintering from constant‐heating‐rate experiments with alumina/5% zirconia. Here, results from a full range of compositions in this two‐phase system are described. They show that the activation energy remains in the range 700 ± 100 kJ/mol when th…
Binding of ethidium to DNA increases the fluorescence efficiency of the molecular ion by about 1 order of magnitude. Quenching of the fluorescence of such an ethidium.DNA complex by tetrakis(4-N-methylpyridyl)porphine (H2T4), and its nickel(II) and zinc(II) derivatives (NiT4 and ZnT4), was investigated in the present…
The mechanism of corrosion inhibition of iron by acetylenic alcohols in acid solutions was established by relating the interfacial structure obtained from spectroscopic measurements with the corrosion reaction kinetics obtained from electrochemical measurements. A modified adsorption interaction model was found to be…
Ionic conductivity in phosphate glasses has been known for almost 30 years. Recently these glasses have been shown to exhibit some of the highest ionic conductivities ever reported. In many cases, because of their ease of preparation, low melting points, strong glass‐forming character, and simple composition, phosphat…
The basic properties of electric polarization response in crystalline dielectrics are theoretically analysed. Spontaneous polarization, pyroelectricity, piezoelectricity, flexoelectricity (polarization response to strain gradient) and thermopolarization effect (polarization response to temperature gradient) are discus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemospecific manipulations of a rigid polysaccharide: syntheses of novel chitosan derivatives with excellent solubility in common organic solvents by regioselective chemical modificationsShinichiro Nishimura, Osamu Kohgo, Keisuke Kurita, and Hiroyoshi KuzuharaCite this: Mac…
The utility of copper interconnects may ultimately depend on the ability to protect copper from corrosion. We have studied the capacity of 1 H ‐benzotriazole (1 H ‐BTA) to provide a protective and stable surface film able to withstand harsh chemical and thermal environments. The film was characterized with electrochem…
Diamond cold cathodes have been formed by fabricating mesa-etched diodes using carbon ion implantation into p-type diamond substrates. When these diodes are forward biased, current is emitted into vacuum. The cathode efficiency (emitted current divided by diode current) varies from 2*10/sup -4/ to 1*10/sup -10/ and in…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorannulene. A convenient new synthesisLawrence T. Scott, Mohammed M. Hashemi, Dayton T. Meyer, and Hope B. WarrenCite this: J. Am. Chem. Soc. 1991, 113, 18, 7082–7084Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 Aug…
Abstract The nature of the siloxane surface in smectites was investigated by measuring the adsorption of aromatic hydrocarbons from water by organo-clays. The organo-clays were prepared by replacing the hydrophilic, inorganic exchange cations of a series of smectites with the small, hydrophobic organic cation, trimeth…
Evidence has been found that the relaxor ferroelectric bears strong resemblance to spin and dipolar glasses. The dielectric dispersion will be shown to have a characteristic freezing temperature, near which the relaxation time distribution strongly broadens extending into the macroscopic time regime. Below this charac…
The grain bulk conductivity of acceptor‐doped SrTiO 3 ceramics was investigated by the impedance analysis method after quenching from high‐temperature equilibria. The influence of the oxygen partial pressure during equilibration, P Eq O2 , is described in terms of a defect model for titanates. From a comparison betwee…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilanation of silica surfaces. A new method of constructing pure or mixed monolayersP. Silberzan, L. Leger, D. Ausserre, and J. J. BenattarCite this: Langmuir 1991, 7, 8, 1647–1651Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published…
Neutron powder diffraction patterns from rutile (TiO{sub 2}, P4{sub 2}/mnm, a=4.594, c=2.959A) and anatase (TiO{sub 2}, I4{sub 1}/amd, a=3.785, c=9.514A) have been analysed by the Rietveld method. The positional parameters were determined to be x{sub O}=y{sub O}=0.30478(6) in rutile and z{sub O}=0.20806(5) in anatase.…