Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract High resolution electron microscope images showing the detailed distribution of metal atoms within the unit cells of complex oxide structures have been recorded recently and as a first approximation may be interpreted as amplitude-object images if obtained with the degree of defocus corresponding to the "opti…
The catalytic reaction between CO and O2 on a Pt (110) surface is investigated by residual gas analysis for different partial pressures of CO and O2 and various temperatures. The surface cleanliness of the Pt crystal is monitored by Auger electron spectroscopy. The results of the reaction study are generally in agreem…
Recent studies of the instantaneous magnetic correlations in ${(\mathrm{C}{\mathrm{D}}_{3})}_{4}$NMn${\mathrm{Cl}}_{3}$ using quasielastic-neutron-scattering techniques have shown that the Mn${\mathrm{Cl}}_{3}$ chains in this compound exhibit purely one-dimensional paramagnetic behavior down to 1.1 \ifmmode^\circ\else…
The electrochemical properties of the Alnico alloys are shown to be sensitive to their state of precipitation. These properties thus are used as an indirect means for evaluating the individual properties of the ferromagnetic phases in these alloys. Results are then compared with recent findings and are shown to agree…
This work investigates experimentally a recent model of magnetomechanical damping based on a distribution of internal stresses, verifies some predictions and extends the model. Damping results are reported for cast irons and iron alloyed with silicon or germanium. As predicted, the maximum magnetomechanical damping ψm…
In this paper the theories of fiber migration have been reviewed. Modification of an analysis of migration in a 7-ply structure has been carried out. The frequency of migration is predicted for two models, and it suggests that slack forma tion is the mechanism for outward migration in an open structure, while forced b…
Thin magnetic-film magnetometers used for magnetic-field measurement are reviewed and compared. A large variety of magnetic thin-film magnetometers have been constructed, and in some cases their properties are unique. A summary of thin-film magnetometers and their performance is provided.
Abstract The cyclization of farnesol with BF3 etherate in dichloromethane solution afforded α-cedrene, 2-epi-α-cedrene and five new hydrocarbons of muurolane type together with isomeric bisabolenes, α-curcumene and δ-selinene. The structure determination of the new compounds and the formation mechanism of cyclized pro…
It was observed in 1907 that iron corrosion products in the cooling water of a marine condenser reduced tube corrosion. However, although intensive investigations in England reported in 1924 further emphasised the importance of iron corrosion products in reducing corrosion of copper base alloys, it is only very recent…
Excitation spectra for Tb 3+ and Ce 3+ as well as fluorescence spectra for Ce 3+ due to 4 f -5 d transitions in calcite-type borates have been measured at liquid helium temperature. Sharp no-phonon lines are accompanied by phonon sidebands extending over 3500 cm -1 . The vibronic sidebands are considered to reflect vi…
Centro de Edafologia y Biologia Aplicada del Segura, Murcia, Spain Institute of Pedology, Uppsala, Sweden
Influence of oxidization and various impurities on the transition temperature of the Verwey order in magnetite was studied experimentally. A small amount of impurities such as Li, Ni, Co, Cr, Al, Ti, Mg, Zn and Ga was doped and the transition temperature was determined by magnetic measurement. The decreases of the tra…
The differential equations and boundary conditions describing the behavior of a finitely deformable, polarizable, and magnetizable, heat conducting continuum in interaction with the electromagnetic field are derived by means of a systematic application of the laws of continuum physics to a well-defined macroscopic mod…
The chemisorption of oxygen on the (100), (110), and (111) faces of silver single crystals was studied with LEED, secondary electron spectroscopy, and other auxiliary techniques. The effect of exposures to oxygen at pressures up to 1 Torr and temperatures up to 500 °C was investigated using a crystal isolation valve.…
This paper reports on extensive eigenvalue measurements made on an X-band waveguide Y-junction containing different ferrite geometries. The frequency dependence of the eigenvalues is used to identify the principal field modes involved, to examine their sensitivities to various junction parameters, and to arrange their…
Polarization observed on applying ac and dc electric fields to samples of β alumina, sodalime glass, and single crystals of sodium chloride have been studied. It is concluded that the large capacitances shown by these materials, which are generally attributed to space-charge effects, are more likely caused by reaction…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of hydrated lanthanide(III) nicotinates, La2(C5H4NCO2)6(H2O)4 and Sm2(C5H4NCO2)6(H2O)4Jerry W. Moore, Milton D. Glick, and W. A. Baker Jr.Cite this: J. Am. Chem. Soc. 1972, 94, 6, 1858–1865Publication Date (Print):March 1, 1972Publication History Published…
The ordered distribution of carbon vacancies in the compound V6C5 has been analysed by electron diffraction and dark-field electron microscopy. The dominant structure is that based on a superlattice with monoclinic symmetry having a lattice orientation relation with the disordered cubic matrix which may be summarized:…
Following the introduction of the concept of continuous spall damage as a replacement for the customary discrete description, existing spall criteria are generalized to continuous measures of damage and are classified according to their dependence on the history of the continuum field variables. A compound-damage-accu…
Abstract Secondary nucleation at low supersaturation for the ammonium sulfate‐water system was studied using a seeded continuous crystallizer. Counter size distribution measurements in the subsieve size range indicated that nuclei are formed by microattrition of seed crystals and that the growth rate of the nuclei is…