Materials Literature
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The free-ion energy level scheme of Cm3+ (aquo) to ∼40 000 cm−1 was determined. Energy level assignments were made based on the correlation between observed band intensities and those calculated using the Judd–Ofelt theory. Use of an expanded set of effective operators provided the basis for computation of free-ion en…
Very accurate measements of the photoemission yield have been performed on the (111) face of silicon as a function of photon energy in the threshold region down to the ${10}^{\ensuremath{-}10}$ range. Using a set of differently doped samples cleaved in ultrahigh vacuum, one can distinguish between surface- and bulk-st…
Drift velocities for holes in high-purity Si were measured for fields between about 3 and 5\ifmmode\times\else\texttimes\fi{}${10}^{4}$ V/cm and temperatures between 6 and 300\ifmmode^\circ\else\textdegree\fi{}K for the crystallogrphic directions $〈100〉$, $〈110〉$, and $〈111〉$. The Ohmic mobility is theoretically inter…
Abstract The homogeneous rate theory of void growth is extended to include the possibility of forming vacancy loops when the irradiation produces cascade damage. The analysis provides a basis for understanding and correlating the relative swelling generated during electron; heavy ion and fast neutron irradiation. In o…
The thermal conductivity, kappa , of seven samples of polyethylene terephthalate (PET) with volume fraction crystallinity varying from 0 to 0.51 has been measured between 1.5 and 70K. The amorphous sample exhibits the characteristic plateau region between 4 and 9K. Above 30K, kappa increases with crystallinity, but th…
Isonicotine hydrazide (INH) and picoline hydrazide (PH) complexes of lanthanides are described. Solid compounds of the compositions Ln(NO 3 ) 3, 3 INH where Ln-La, Nd, Gd, Er, Y; Ln(ClO 4 ) 3 , 5 INH where Ln-La, Pr, Nd and Ln(ClO 4 ) 3 , 3 INH. H 2 O when Ln-Gd, Dr and Y and Ln Cl 3 · 3 PH when Ln-La and Nd have been…
Computer-simulation studies of the motion of a straight screw dislocation in a bcc crystal were performed. It was observed that a dislocation running with the speed near the shear wave velocity formed a microtwin without a pole mechanism.
Chemical preparations and crystal data are described for five new tetrametaphosphates: CaK2P4O12, PbK2P4O12, PbRb2P4O12, Pb(NH4)2P4O12 and PbTl2P4O12. All of them are tetragonal and isotypic with SrK2P4O12. The space group is I\bar 4 with Z = 2.
Abstract A critical survey of the published theoretical and experimental approaches to diffusion in liquids is presented. A study of the effects of temperature and viscosity demonstrates that the Stokes — Einstein equation and other relations derived from the hydrodynamic theory can only be applied in special cases. C…
A Ruderman-Kittel interaction between magnetic ions is assumed and the defect is represented by a change in the hopping integral of the conduction electrons. If the hopping integral across the defect is substantially larger than the perfect crystal value, the direction of magnetization reverses across the defect. This…
Low order electron diffraction intensity is sensitive to the electron state of a crystal. Based on this fact, an electron diffraction study has been made to determine the electron state of the ferrimagnetic interstitial compound Mn 4 N by measuring its low order superstructure reflection intensities from polycrystalli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and properties of the solid solution series zinc iron phosphorus trisulfide (Zn1-xFexPS3) (0 .leq. x .leq. 1)Jean P. Odile, John J. Steger, and Aaron. WoldCite this: Inorg. Chem. 1975, 14, 10, 2400–2402Publication Date (Print):October 1, 1975Publication History P…
Neutron small-angle scattering in polycrystalline Al–Mg alloys aged nine months at 0°C has revealed the existence of Guinier–Preston zones in an Al–11.5% Mg alloy, but no G. P. zones in an Al–7% Mg alloy. The evaluation of the data for the 11.5% Mg alloy gives the following parametric values: mean radius of the zones,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the Activated Carbon-Steam ReactionHerbert E. Klei, James Sahagian, and Donald W. SundstromCite this: Ind. Eng. Chem. Process Des. Dev. 1975, 14, 4, 470–473Publication Date (Print):October 1, 1975Publication History Published online1 May 2002Published inissue 1 O…
The semi-continuum model of the lattice dynamics of layer crystals devised by Komatsu for application to graphite is here applied to hexagonal boron nitride. It is found that the thermal expansion coefficient αc parallel to the hexagonal axis is determined almost completely by the out-of-plane acoustic vibrational mod…
Thomas A. Carlson, The Nature of Secondary Electrons Created as the Result of Electron Shake-Off and Vacancy Cascades, Radiation Research, Vol. 64, No. 1, Symposium on the Distribution of Secondary Electrons from Ionizing Collisions (Oct., 1975), pp. 53-69
A six-dimensional integral in the coordinate space of two particles 1 and 2, where the integrand contains Coulomb functions for both the particles, the term $\frac{1}{|{\stackrel{\ensuremath{\rightarrow}}{\mathrm{r}}}_{1}\ensuremath{-}{\stackrel{\ensuremath{\rightarrow}}{\mathrm{r}}}_{2}|}$, and an exponential term, i…
The normal vibrations of crystalline trans-1,4-polybutadiene have been calculated by combining interchain atom-atom potentials with the previously proposed intrachain force field. These calculations have been used to analyze the infrared and Raman spectra of an essentially all-trans urea-complex polymer. The band spli…
Abstract The assignment of the Raman frequencies from 200 to 1800 cm −1 has been made taking into account the values calculated by Brandmüller et al. for a planar molecule since only the H atoms of NH 2 are out of the plane. In the crystal the V line is unusually weak and the 1276–1284 cm −1 broad band is extremely st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarized crystal spectra of potassium tetrachloropalladate(II) and potassium tetrabromopalladate(II)Rhonda M. Rush, Don S. Martin, and Roger G. LeGrandCite this: Inorg. Chem. 1975, 14, 10, 2543–2550Publication Date (Print):October 1, 1975Publication History Published online…