Materials Literature
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Magnetic and crystallographic measurements were made for Co2-xFexMnM (M Si, Ge, Sn and Ga) and Co2-xMnxSi. In Co2MnM, the magnetic moment (µP) in the paramagnetic temperature region is generally much smaller than the ferromagnetic moment (µF) at T = 0 K, which implies that the Co-moment disappears above TC. The other…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational analysis of sublevel phosphorescence spectra of potassium tetrakis(.mu.-diphosphonato)diplatinate(II): mechanism of radiative transition for the electronically forbidden A1u spectrumTakeshi Ikeyama, Seiichi Yamamoto, and Toru AzumiCite this: J. Phys. Chem. 1988,…
Abstract Chlorite belonging to subfamily C, vermiculite 2 M B -VII-meso, talc and a monoclinic amphibole were identified in rocks from a contact zone between highly tectonized granite and serpentinite at Jordanów, Lower Silesia, Poland. K-saturated vermiculite readily produced a phlogopite-like structure 1 M -I (3T A…
Se estudia la composición específica del fitoplancton de 16 lagunas de alta montaNa de Sierra Nevada. Las lagunas estudiadas se encuentran situadas sobre sustrato silíceo y con una altitud comprendida entre los 2.500 y los 3.100 m. Presentan un período libre de hielo que oscila entre 5 y 6 meses, normalmente de ju…
Abstract Novel Ni-hectorite inorganic complexes were synthesized hydrothermally from homogeneous Ni–Si hydrous oxide gel at 200 °C for 2 h. Dispersed slurries of these complexes showed rheological properties similar to those of natural smectites and, on heating, formed porous materials characterized by large specific…
Abstract The IR and Raman spectra of various saturated solutions of 4‐nitropyridine N ‐oxide (NPO) and NPO‐ d 4 were recorded in the range 4000–350 cm −1 . They were assigned according to previous results for the crystal. A strong Fermi resonance is observed in the ν as (NO 2 ) region for solutions of NPO in CCI 4 , C…
In this paper, we compare various analyses of the magnetic Mössbauer spectra of Nd2Fe14B and propose a new model based on the positions of the rare-earth neighbors of each iron site. This model gives excellent fits from 295 K down to the spin-reorientation temperature and can be extended to Y2Fe14B.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of 2,3-norbornadienonaphthaceneHarish K. PatneyCite this: J. Org. Chem. 1988, 53, 26, 6106–6109Publication Date (Print):December 1, 1988Publication History Published online1 May 2002Published inissue 1 December 1988https://pubs.acs.org/doi/10.1021/jo00261a023https:…
Isolated Ba ferrite particles are prepared by the conventional powder metallurgical method, and the magnetic domains of about 200 particles 0.5 to 5 µm in size are investigated by the colloid-SEM method (the Bitter method using a scanning electron microscope). The relationship between the three-dimensional sizes of Ba…
Abstract This paper presents the first Table of RIR values for quantitative analysis as a model for regular updates which will appear in future issues. Diffractionists interested in the reference intensity method of quantitative analysis are urged to read the criteria for preparing data to continue this Table and then…
Electrochemical reduction of in various electrolytes at 150°C has been found to result in the formation of vanadium pentoxide bronzes of formula according to the reaction scheme: with for , respectively. X‐ray diffraction experiments show that bronzes exhibit, at least in the compositional range , an orthorhombic stru…
We call magnetization swirls small vortex-like micromagnetic structures at the surface of soft magnetic (low-anisotropy) materials which are magnetized perpendicular to the surface in their core region. In this paper the occurrence of swirls is discussed and their structure is explored by a Ritz method calculation. Th…
The X-Ray Powder Data File (XRPDF) enables one to identify the compounds in a sample. More often than not, however, a semi-quantitative analysis is wanted. Visual inspection of the pattern may give a vague impression of the composition, but the errors of such a result are usually not within reasonable limits. Clearly…
Abstract Earth alkaline titanates which are commonly used as dielectrics in ceramic capacitors may exhibit a long‐term degradation of the insulation resistance under simultaneous dc field and temperature stress. In order to study the nature of this process, it is necessary to detect the time evolution of the potential…
Symmetry properties of the converse piezoelectric effect are investigated for their use in fiber-optic sensing of individual electric field components. Three basic sensor designs are analyzed in detail. Suitable sensor materials are identified and relevant material properties are discussed. The sensitivity of the sens…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic, structural, electrochemical, and kinetic studies of ligand substitution in the 33e dinuclear radical Fe2(CO)7(.mu.-PPh2) and the 34e analogs [Fe2(CO)7(.mu.-PPh2)]- and FeCo(CO)7(.mu.-PPh2)R. T. Baker, J. C. Calabrese, P. J. Krusic, M. J. Therien, and W. C. Tro…
In the system ZrO 2 ‐Al 2 O 3 , cubic ZrO 2 solid solutions containing up to 40 mol% Al 2 O 3 crystallize at low temperatures from amorphous materials prepared by the simultaneous hydrolysis of zirconium and aluminum alkoxides. The values of the lattice parameter, a, increase linearly from 0.5095 to 0.5129 nm with inc…
The possible effect of different salinities on the valve morphology of the marine centric diatom Thalassiosira decipiens was investigated. Cultures were grown in media of salinities ranging from 2 to 35%. for 40 days. Only the 15, 20, 25, and 30%. cultures had sufficient growth for statistical analysis of population d…
For the first time carbohydrate derivatives were systematically studied as doping material for a liquid crystalline phase. These compounds can exhibit a large twisting power. It may be controlled by the configurations of single chiral centers. Thus, a series of phenomena are realized in the cholesteric phase such as h…
We have used a membrane-leak mass spectrometer to follow the time courses of H2 evolution and substrate reduction by nitrogenase [reduced ferredoxin:dinitrogen oxidoreductase (ATP-hydrolyzing), EC 1.18.6.1]. In the absence of added substrates, dinitrogenase passes all of its electrons to protons to form H2, but when a…