Materials Literature
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It is shown that the sum of the intensities for magnetic dipole transitions between crystal-field components of two free-ion levels in lanthanide spectra is almost independent of the symmetry of the environment. A mean theoretical sum value of 18×10−7𝒟2, 94×10−7𝒟2, and 9×10−7𝒟2 for, respectively, the 5D1←7F0, 5D0←7F1,…
Electrical properties and microstructures of a holmium-doped (Ba 1.01 Mg 0.01 )O 1.02 (Ti 0.98 Zr 0.02 )O 2 system were studied. Additions of Ho 2 O 3 had little effect in preventing the dielectrics from reducing at high temperature, but the resistivity at low temperature increased with increasing amount of Ho 2 O 3 w…
A mathematical analysis is carried out for the Cahn–Hilliard equation where the free energy takes the form of a double well potential function with infinite walls. Existence and uniqueness are proved for a weak formulation of the problem which possesses a Lyapunov functional. Regularity results are presented for the w…
The most comprehensive collection of time-temperature diagrams for irons and steels ever collected. Between this volume and its companion, Atlas of Time Temperature Diagrams for Nonferrous Alloys, you'll find the most comprehensive collection of time-temperature diagrams ever collected. Containing both commonly used c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConjugated aromatic poly(azomethines). 1. Characterization of structure, electronic spectra, and processing of thin films from soluble complexesChen Jen Yang and Samson A. JenekheCite this: Chem. Mater. 1991, 3, 5, 878–887Publication Date (Print):September 1, 1991Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereocomplex formation between enantiomeric poly(lactic acid)s. 4. Differential scanning calorimetric studies on precipitates from mixed solutions of poly(D-lactic acid) and poly(L-lactic acid)Hideto Tsuji, Suong Hyu Hyon, and Yoshito IkadaCite this: Macromolecules 1991, 24…
Air-filled microbubbles are in clinical use as echo-contrast agents for sonographic applications. The synthesis of aqueous suspensions of air-filled proteinaceous microbubbles involves the ultrasonic irradiation of aqueous protein solutions in the presence of O2. Yields and size distributions of human and bovine serum…
The oxidation kinetics of copper thin films have been studied at temperatures below 200 °C in air. The protection of copper from oxidation can be achieved by alloying copper film with Ti, Pd, Cr, or Al. The influence of the composition and microstructure to the oxidation rate has been studied. The compounds Cu3Ti, Cu3…
The present review on thermal stresses in materials with temperature-dependent properties focuses on papers published after 1980. The thermal and mechanical properties in materials subjected to thermal loads due to high temperature, high gradient temperature, and cyclical changes of temperature are dependent on temper…
Molecular-dynamics (MD) simulations have been carried out on a two-component Lennard-Jones system, quenched into supercooled and amorphous states. Two different regimes of viscous behavior are found in the time window accessible in MD simulation studies (of the order of nanoseconds if units appropriate for argon are u…
The corrosion inhibition of nickel in acid solutions by 2-(triphenyl phosphoranylidene) succinic anhydride (2TPSA) has been investigated using DC and AC techniques. The percentage inhibition was up to 85 percent at a concentration of 400 μ/W of 2TPSA. The inhibitor used was found (1) to shift the corrosion potential t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural analysis of polymer-protected palladium/platinum bimetallic clusters as dispersed catalysts by using extended x-ray absorption fine structure spectroscopyNaoki Toshima, Masafumi Harada, Tetsu Yonezawa, Kakuta Kushihashi, and Kiyotaka AsakuraCite this: J. Phys. Che…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly oxidation resistant inorganic-porphyrin analog polyoxometalate oxidation catalysts. 1. The synthesis and characterization of aqueous-soluble potassium salts of .alpha.2-P2W17O61(Mn+.cntdot.OH2)(n-10) and organic solvent soluble tetra-n-butylammonium salts of .alpha.2-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereocomplex formation between enantiomeric poly(lactic acid)s. 3. Calorimetric studies on blend films cast from dilute solutionHideto Tsuji, Suong Hyu Hyon, and Yoshito IkadaCite this: Macromolecules 1991, 24, 20, 5651–5656Publication Date (Print):September 1, 1991Publicat…
Abstract Almost three decades ago, the field of nonlinear optics evolved with the discovery of lasers. In the beginning, nonlinear optical (NLO) phenomena were investigated in inorganic materials, leading to the development of traditional NLO materials such as lithium niobate, potassium titanyl phosphate, quartz and g…
A lipophilic interior and a hydrophilic surface characterize ammonium [82.3] micellanoates, which are cascade polymers that contain only sp3Catoms and CH2 groups in the interior and CO groups on the surface. The micellar properties have been investigated by absorption and fluorescence spectroscopy and by electron a…
The thermoelectric properties of N-type and P-type Si-Ge alloys have been reviewed and detailed calculations for the efficiency of a thermoelectric generator made from a 70% Si-30% Ge alloy have been made over the temperature range from 300 to 1300 K. A model employing one valence band and two conduction bands has bee…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyimide derived from 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl. 1. Synthesis and characterization of polyimides prepared with 2,2'-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride or pyromellitic dianhydrideTohru Matsuura, Yoshinori Hasuda, Shiro Nishi, and Noriy…
A review is given of the formation, the crystal structure and the magnetic properties of several classes of rare earth based intermetallic compounds that lend themselves as starting materials of permanent magnets. These compounds include R 2 Fe 14 B, R 2 Fe 14 C and R 2 Co 14 B and the large class of ternary rare eart…
One of the (Bi 1/2 Na 1/2 )TiO 3 (BNT)-based solid solutions, Ba-modified bismuth sodium titanate, (Bi 1/2 Na 1/2 ) 1- x Ba x TiO 3 (BNBT), is studied for its dielectric and piezoelectric properties as a new group of lead-free piezoelectric ceramics. A rhombohedral (F α )-tetragonal (F β ) morphotropic phase boundary…