Materials Literature
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Experimental evidence is presented to demonstrate the scaling relations of the similarity principle for multipacting as applied to coaxial electrodes with b/a (b and a are the radii of the outer and inner electrodes, respectively) varying between 2.3 and 18.26. The two field configurations considered are: (1) rf volta…
The thickness dependence of the thermal emf of thin-film copper—constantan thermocouples at room temperature and above shows nearly bulklike behavior when the thickness of both elements comprising the thermocouple is greater than ∼1200 Å. The thermal response time of the thermocouples as measured with a pulsed laser b…
This paper examines the temperature dependence predicted by theories of dispersed barrier hardening. Most of interaction potentials employed in the theories are similar. It is not possible to select one of several interaction potentials on the basis of an experimentally obtained stress-temperature relationship. This p…
The scattering of x rays from the free surface of liquid benzene has been analyzed at 25°C. The diffractometer used was specially designed for the study of liquid structure. Intensity and radial distribution functions have been computed for a model structure and compared to those derived from experiment. The model ass…
The magnetic and crystallographic properties of CaZn5-type intermetallic compounds of cobalt and rare-earth elements (including Th) have been investigated. Strong deviations from 1:5 stoichiometry are observed when the rare-earth radius becomes relatively small. Both the saturation magnetizations (4πIs=2360–12 300 G)…
The energy spectra of Auger electrons emitted from many elements and alloys have been observed. Differentiation of the secondary electron-energy distribution by perturbation and synchronous detection techniques, and suppression of the effects of low-energy secondaries, were used to obtain well-defined spectra. The Aug…
Samples of glassy carbon prepared from two different resins and given different heat treatments have been studied with small-angle x-ray scattering to determine pore structure and concentration. The results of the study are described and discussed after an initial section in which the analytical methods used are defin…
The plastic deformation behavior and modes of fracture exhibited by tubular bomb casings are greatly influenced by the stress state imposed by explosive and inertial forces. These forces combine to produce triaxial compression over a varying inner portion of the tube wall. Noting that compressive hoop stresses would e…
Absorption and emission spectra of nine (4d)6 ruthenium(II) complexes dissolved in rigid glasses are reported. Tris(bipyridine), tris(o-phenanthroline), bis(tripyridine), and a series of cis-substituted bis(bipyridine) complexes of ruthenium(II) were synthesized. The cis substituents were cyanide, ethylenediamine, pyr…
In a polycrystalline ferromagnetic film, the magnetization direction is not uniform but exhibits small wave-like fluctuations known as magnetization ripple. In this paper, a general theory of ripple is developed, extending previous treatments by the present author, Hoffmann, and others. The theory is applicable to alm…
The real (${\ensuremath{\epsilon}}_{1}$) and imaginary (${\ensuremath{\epsilon}}_{2}$) parts of the dielectric response function, together with the energy-loss function Im ($\frac{1}{\stackrel{^}{\ensuremath{\epsilon}}}$), of freshly cleaved single crystals of NaCl and KCl were obtained in the region 5-28 eV by Kramer…
The resistivities of epitaxially grown silver films have been measured as a function of temperature from 4.2 to 295\ifmmode^\circ\else\textdegree\fi{}K. Both the temperature-independent residual resistivity and the temperature-dependent resistivity were found to increase with a decrease in the specimen thickness. The…
Plastic deformation bands nearly parallel to planes of maximum shear stress have been observed in unoriented glassy polystryene in compression and in preoriented polystyrene in tension and torsion. In the temperature range 77°–375°K, the shear stress for homogeneous nucleation of deformation bands is of the order of a…
Samples of ${\mathrm{La}}_{0.5}$${\mathrm{Sr}}_{0.5}$Co${\mathrm{O}}_{3}$ were prepared, and a study was made of their electrical and magnetic properties. Investigation of the initial susceptibility immediately above the Curie point ${T}_{c}$ determined that the critical exponent $\ensuremath{\gamma}=1.27\ifmmode\pm\e…
The optical-absorption characteristics of the perovskite oxides BaTi${\mathrm{O}}_{3}$, KTa${\mathrm{O}}_{3}$, and K${\mathrm{Ta}}_{0.65}$${\mathrm{Nb}}_{0.35}$${\mathrm{O}}_{3}$ (KTN) are reported in the vicinity of the interband absorption edge, and, in the case of semiconducting KTN, in the near infrared where dono…
The theory of the effect of a dynamic Jahn-Teller effect on the electron-paramagnetic-resonance spectrum of a $^{2}E$ state is developed from the limit of weak Jahn-Teller coupling taking account only of linear coupling. The principal changes produced in the EPR spectrum of the vibronic ground state may be represented…
I'EBRUARY 1/68 second type consists of mobile damage centers which congregate along existing imperfections.The first type can be either microscopically reversible or irreversible.As there is no ev- idence from our measurements that the dam- age in KDP extends beyond the unit-cell level it is classified as microscopica…
Improved lithium-drifted silicon solid-state detectors allow detection and energy dispersion of x-rays of about 3 to 30 kiloelectron volts in the electron-microprobe x-ray analyzer. Energy resolution is sufficient to separate peaks of characteristic x-rays of elements adjacent in the periodic system at atomic number 2…
Ferromagnetism, antiferromagnetism, or superconductivity has been discovered in most hexa- and dodecaborides.
Dispersions of (UTh)O 2 in beryllia containing 1.7 to 25 vole%, (UTh)0 2 in coarse (150 to 200P), medium (33 to 35P), and fine (<10 and <5μ) fuel particle sizes were irradiated to burnups of 3 to 10% of heavy metal atoms between 300’and 900°C, in both fast and thermal fluxes. Changes in volume, lattice parameter…