Materials Literature
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Tabulations are presented of the atomic form factor, F (α,Z), and the incoherent scattering function, S (x,Z), for values of x (=sin ϑ/2)/λ) from 0.005 Å−1 to 109 Å−1, for all elements A=1 to 100. These tables are constructed from available state-of-the-art theoretical data, including the Pirenne formulas for Z=1, con…
The anisotropic magnetoresistance effect in 3d transition metals and alloys is reviewed. This effect, found in ferromagnets, depends on the orientation of the magnetization with respect to the electric current direction in the material. At room temperature, the anisotropic resistance in alloys of Ni-Fe and Ni-Co can b…
The dc and microwave conductivities of the new organic charge-transfer salt hexamethylene-tetraselenafulvalinium tetracyanoquinodimethanide (HMTSF-TCNQ) remain metallic in magnitude to temperatures at least as low as 1.1 K. At low $T$ we observe a resistance minimum and thermoelectric anomaly consistent with the theor…
Room-temperature electrical resistivity, Hall mobility and Seebeck coefficient measurements on relatively-low-density, hot-pressed, boron-doped Ge 20 Si 80 alloys are reported as functions of 1/R H e in the range 2*10 19 -3.4*10 20 cm -3 . The temperature variations of resistivity and Seebeck coefficient are reported…
Cross sections for electron-mercury scattering at incident electron energies from 0.1 to 1.4 eV have been calculated by numerical solution of the Dirac equation including exchange and a polarization potential but not coupling to inelastic channels. A resonance has been found in the p 1/2 partial wave at about 0.2 eV w…
Using the form factor approximation and nonrelativistic Coulomb wavefunctions, cross section profiles for Compton scattering of gamma rays are calculated for all subshells of the atom. Spherical coordinate are used in order to facilitate a straightforward application of self-consistent wavefunctions. Relativistic ener…
Abstract Übersicht über Nomenklatur sowie Synthese, molekulare Schwingung und Geometrie, Elektronenstruktur und thermodynamische Eigenschaften der Chalkogenocyanat‐Ionen.
Single crystals of iron-doped Ta${\mathrm{S}}_{2}$ grown from sintered powders of composition ${\mathrm{Fe}}_{0.05}$-Ta${\mathrm{S}}_{2}$ show a rise in critical temperature to above 3 K and an enhanced anisotropy of ${H}_{c2}$ which is comparable to that observed in $2H$-Ta${\mathrm{S}}_{2}$${(\mathrm{pyridine})}_{\m…
Compression tests have been carried out on Ni-rich single crystals of Ni3(Al, Ti) with [001] and [132] compression axes over the temperature range −110 to 1000 °C. The [132] orientated crystals exhibited a peak in the flow stress at about 450 °C. Slip line and dimensional analysis revealed five different modes of defo…
In an attempt to grow crystals of ammonium acid phthalate with the aim of refining the previously reported gross structure, the diammonium salt was obtained. (NH4)2(OOC. C6H4. COO), orthorhombic, a=6.839 (14), b=13.041 (4), c=22.118 (8)A, Pcab, 0obs = 1.34 Qcalc = 1.34 g cm -3, Z = 8. The structure was solved by direc…
A theoretical model for the calculation of the one- and two-phonon Raman scattering intensities (far from resonance) for covalent crystals is presented. Starting from Placzek's theory, the crystal polarizability is expressed as a sum of individual bond contributions. Instead of the usual "electron-phonon" and "electro…
The homogeneous nucleation of crystals in normal alkane liquids has been studied using a droplet technique for a range of alkanes between C16H34 and C5H12. The critical undercooling for nucleation, ΔTN, relative to the melting point TE, increases significantly with decreasing length of the alkane chain n: ΔTN/TE incre…
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A review of the results of published energy-band calculations for the alkali halides is presented in which the experimental results of the preceding paper are used as a basis for critical comparison of theory and observation. Band calculations employing Slater exchange are shown to be inadequate, while calculations wh…
A unified band-crossing model of the insulator-metal transition in ${\mathrm{Ti}}_{2}$${\mathrm{O}}_{3}$ and the high-temperature tranistion in ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ is presented. The model is based on a Hartree-Fock free-energy calculation including electron-electron Coulomb energy, elastic energy, and…
Crystals of BaNaPO 4 were grown from a Ba 3 P 2 O 8 –Na 2 B 4 O 7 melt. The crystals are trigonal, space group [Formula: see text]with a = 5.622(4) and c = 7.259(5) Å. The structure, isotypic with that of glaserite, was refined by full-matrix least-squares methods to a final R value of 0.042 using 218 unique reflectio…
The decay of the excited $^{4}S_{\frac{3}{2}}$ state of ${\mathrm{Er}}^{3+}$ ions in La${\mathrm{F}}_{3}$ at 295\ifmmode^\circ\else\textdegree\fi{}K has been investigated in detail. The energy is transferred from the thermally populated multiplet $^{2}H_{\frac{11}{2}}$. The decay curve of the luminescence from $^{4}S_…
An X-ray integral breadth analysis has been made for the 111, 200, 220, 311 and 222 diffraction profiles recorded on a Geiger counter X-ray diffractometer from the vacuum-evaporated thin films of silver in the range of thickness 580 to 2125 Å. The analysis based on the methods of single and multiple order of reflectio…
Spontaneous magnetostriction of NiO, which consists of two strain components, is reexamined in detail by Berg-Barrett method. The strain components thus determined are e x ' x ' -e y ' y ' =-5.4×10 -4 and e z ' x ' =0.91×10 -4 , respectively. These values are a few times as large as those found previously by Yamada et…
The general spin-relaxation theories of Albers and Deutch and of Argyres and Kelley based on different projection operator methods, and the theory of Freed based on generalized cumulant expansions are compared. It is shown that the first two yield equivalent expressions for the time evolution of the spin density matri…