The crystal structure of trimeric palladium(II) acetate
Palladium(II) acetate has a trimeric structure, of approximate symmetry D3h, in which each of the palladium atoms is joined to the other two by double acetate bridges.
Materials Literature
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Polyurethane Ionomers, a New Class of Block Polymers
Abstract Linear polyurethanes containing ionic centers at wide intervals are heteropolymers having a pronounced segment structure, i.e. ionomers. As a result of interactions between chains (Coulomb forces and hydrogen bonds), their properties are similar to those of crosslinked elastomers. They are strongly associated…
The kinetics of migration of point defects to dislocations
In this review we discuss the various ways in which dislocations interact with and provide sites for the segregation of point defects. Since there is, in general, a long-range interaction between a point defect and a dislocation, the kinetics of the migration of the point defects to the dislocations will depend on the…
Charge-Transfer Spectra of Transition-Metal Ions in Corundum
The ultraviolet absorption spectrum of corundum (${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$) containing dilute concentrations of the $3d$-series transition-metal ions ${\mathrm{Ti}}^{3+}$, ${\mathrm{V}}^{3+}$, ${\mathrm{Cr}}^{3+}$, ${\mathrm{Mn}}^{4+}$, ${\mathrm{Fe}}^{3+}$, and ${\mathrm{Ni}}^{3+}$ was measured at room te…
The diffusion coefficients of hydrogen and deuterium in vanadium, niobium, and tantalum by gorsky‐effect measurements
Abstract Gorsky‐effect measurements on vanadium‐, niobium‐, and tantalum‐samples loaded with different concentrations (0.2 to 4.3 at%) of hydrogen or deuterium are reported. From the relaxation strength the trace of the dipole‐moment tensor of hydrogen and deuterium was determined and found to be consistent with the l…
Clean Surfaces: Their Preparation and Characterization for Interfacial Studies
Abstract not Available.
Measurements of the a-Dependence of Deep Inelastic electron Scattering from Nuclei
DEEP INELASTIC SCATTERING FOR 8 NUCLEAR TARGETS MEASURED AT SLAC TO INVESTIGATE A-DEPENDENCE OF THE EMC EFFECT. RESULTS ARE GIVEN AS RATIOS OF CROSS-SECTIONS WITH RESPECT TO DEUTERIUM. RANGE IS 0.09& lt;X& lt;0.9 AND 2 & lt; Q**2 & lt; 15 GEV**2.
Complex lattice potentials in electron diffraction calculated for a number of crystals
Structure potentials, Vg, and absorption potentials for 100 keV-electrons are given in tabulated form for almost all monatomic crystals with elements Z = 3 to 90 and for a number of crystals of the rock-salt type. The absorption potentials are given in the form of the Fourier coefficients Ci0g of the Yoshioka imaginar…
Modules élastiques des métaux de transition
Les modules élastiques des métaux de transition sont étudiés dans un modèle où l'énergie totale du cristal est écrite comme somme d'une contribution due à la bande d traitée dans l'approximation des liaisons fortes et d'une contribution répulsive de type Born-Mayer. Ce modèle permet de rendre compte de la variation du…
Scanning Transmission Electron Microscopy*. I
shown how this equivalence can be deduced from the consideration of either Numerical calculations were performed to find the optimum conditions for viewing single atoms, and it was observed that the contrast increases considerably when the accelerating voltage is raised above 100 KV. Simple analytic expressions are gi…
Crystallization Of Zinc Sulphate Single Crystals And Its Structural, Thermal And Optical Characterization
Zinc sulphate (ZnSO4.7H2O), an inorganic material has been crystallized by an isothermal evaporation method. ZnSO4.7H2O is highly soluble in water and the solubility is found to be increased almost linearly with the increase of temperature. At room temperature around 34°C, the solubility was found to be 92.41 gm/50 ml…
Microwave Behavior of Partially Magnetized Ferrites
The high frequency permeability of partially magnetized ferrites is calculated for some simple domain configurations, comprising only ``up'' and ``down'' domains. The method used is based upon the magnetostatic approximation and neglects exchange effects, but is otherwise substantially rigorous. The components of the…
Electronic States of Mn2+-Activated Phosphors.
The electronic states of Mn 2+ are derived from excitation spectra for five green‐emitting phosphors: ( i ) , ( ii ) , ( iii ) , ( iv ) , and ( v ) . Only is found to give a spectrum consistent with octahedral (or tetrahedral) symmetry of Mn 2+ ; the other four phosphors show spectra typical of Mn 2+ in symmetry lower…
Some applications of the Taylor theory of polycrystal plasticity
Abstract The Taylor theory of polycrystal plasticity was applied to three‐axial deformation accomplished by glide on (111) [110] or (110) [111] glide systems. The orientation dependence of the Taylor factor was used to calculate the angular dependence of the relative strength of a textured material. The angular depend…
Dislocations and stacking faults
The properties of linear defects in crystals (dislocation lines) and of planar defects (stacking faults) are important in almost every branch of solid state physics. This article is intended to give a comprehensive introduction to dislocation theory for the physicist who is not a specialist in crystal plasticity. It b…
Measurement of Forbidden Energy Gap of Semiconductors by Diffuse Reflectance Technique
Abstract Diffuse reflectance technique for the measurement of forbidden energy gap, E g , is discussed. The energy coordinate of the point at which the linear increase in the Kubelka‐Munk function starts gives the E g ‐value. The E g ‐values of fifteen semiconductors are reported. These E g ‐values are found to be in…
Bis-1,3-dithiolium chloride: an unusually stable organic radical cation
Treatment of bis-1,3-dithiole with 1 equiv. of chlorine affords a very stable radical cation which is amenable to full chemical and spectroscopic characterization.
A Reinterpretation of Organic Liquid-Polytetrafluoroethylene Surface Interactions
The wettability of polytetrafluoroethylene (PTFE) by organic liquids is reanalyzed in terms of dispersion-polar interactions across the liquid-solid interface. The analysis provides values of γs d = 19.6 dyne/cm, and γS D = 2.0 dyne/cm for the respective dispersion and polar parts of the surface tension γs = 21.6 for…
The temperature and strain-rate dependence of the shear strength of mild steel
An account is given of experiments in which the shear flow stress of mild steel was measured at temperatures from 195 to 713°K and strain rates from 10−3 to 4 × 104 sec−1. The experimental results obtained at room temperatures are compared with those of earlier tension tests. The rate sensitivity of the flow stress, (…
Stress tensor for a nematic liquid crystal
Constitutive equations for nematic liquid crystals were first established by Ericksen and Leslie. They used a stress tensor with six viscosity coefficients αi (i = 1...6). It is shown in this paper that the Onsager reciprocal relations lead to the relation α2 + α 3 = α6 - α5 . Hence there are only five independent vis…