Materials Literature
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The stage and temperature dependences of the in-plane thermal conductivity of graphite-Fe${\mathrm{Cl}}_{3}$ acceptor intercalation compounds are reported and analyzed, as well as the temperature dependence of a stage-5 potassium donor compound. The measured thermal conductivity is tentatively separated into an electr…
We have measured the enhanced Raman scattering by a liquid (methyl alcohol) in contact with an evaporated film of silver (\ensuremath{\sim}400 \AA{}) deposited on the flat surface of a hemispherical prism. The exciting laser light (5145 \AA{}) was incident on the film through the prism and the scattered light from the…
Experimental measurements and theoretical calculations are reported which may resolve some of the remaining difficulties associated with photoemission from anion vacancies in thermochemically reduced MgO crystals. The intensities of the 2.3- and 3.2-eV luminescence bands are found to be strongly influenced by both the…
Vanadium dioxide (VO2) film which has nearly the same transition point as single crystal has been obtained by reactive evaporation of vanadium on glass and subsequent annealing in N2 gas. Relations between optical properties of V02 film and its preparation conditions are presented. We made optical direct bit recording…
Carbon dioxide formation from coadsorbed atomic oxygen and molecular carbon monoxide has been characterized using temperature programmed reaction spectroscopy over a wide range of initial oxygen and carbon monoxide coverages. The experiments were performed in an apparatus containing Auger electron spectroscopy, low en…
Results are reported of polar magneto-optical Kerr effect measurements performed at room temperature on the Heusler alloy PtMnSb in the wavelength range 280–2000 nm. The double Kerr rotation has a maximum in excess of 2.5° at 720 nm, which is to our knowledge the highest room-temperature Kerr rotation reported thus fa…
The inelastic neutron, Raman, and infrared vibrational spectra of vitreous Si${\mathrm{O}}_{2}$, Ge${\mathrm{O}}_{2}$, and Be${\mathrm{F}}_{2}$ are reported in detail and compared with one another. The neutron spectrum is shown to be a good measure of the vibrational density of states for glassy Si${\mathrm{O}}_{2}$ a…
With the use of a lattice-dynamical model which reproduces observed phonon dispersion curves very accurately, the isotope scattering of near-zone-boundary acoustic phonons in Ge is investigated theoretically. We show that the lattice dispersion which becomes appreciable in the THz-frequency region leads to the phonon…
Photoemission, Auger, and x-ray absorption spectroscopy have been used in a systematic study of small metal clusters on a variety of supports. The degree of cluster-support interaction for clusters of group-VIII and noble metals can be divided into two categories: supports with localized $p$ or $d$ orbitals with bindi…
Thin films of tin disulphide are prepared by reactive evaporation. It is shown that heating above 410K in vacuum reduces the resistivity of the as-prepared film by about ten orders of magnitude. Activation energies for conduction for both as-prepared and annealed films are determined. The refractive index and extincti…
Energy broadening of the incoherent quasielastic neutron scattering from a single crystal of the fast-ion conductor strontium chloride at 1053K has been measured for scattering vectors along the three principal crystal symmetry directions. The data are well accounted for by either the random-jump diffusion model of Ch…
Stage-1 Eu-intercalated graphite Eu${\mathrm{C}}_{6}$ was studied by M\"ossbauer and $L$-edge spectroscopy. Isomer shift and ${L}_{\mathrm{III}}$-edge position results indicate the divalent state for Eu. Below 40 K, Eu${\mathrm{C}}_{6}$ orders antiferromagnetically with the Eu spins oriented perpendicular to $\stackre…
The self‐diffusion of 18 O‐enriched oxygen in forsterite was determined by measuring the bulk concentration using the nuclear reaction 18 O(p,α) 15 N. Important technical improvements led to a more precise determination of the 18 O diffusion profiles. These results indicate that the self‐diffusion coefficient D* is in…
Significant surface characteristics changes have been noticed on materials that were exposed in the payload bay of the Space Shuttle Orbiter on the first four flights. The most notable change was mass loss of Kapton film used as a component of thermal blankets. This film exhibited as much as 35 percent mass loss on ST…
The energy-resolved spin polarization $P$ of secondary electrons from Ni(110) has been measured with high energy resolution. At the lowest kinetic energy $P$ reaches a maximum of (17\ifmmode\pm\else\textpm\fi{}2)% which is significantly higher than the mean conduction-band polarization (5.5%). Within about 3 eV toward…
アルカリニケイ酸塩, ニゲルマン酸塩及びメタリン酸塩ガラス (アルカリ=Li, Na, K) の生成熱を改訂した. Si-O, Ge-O, P-O及びO-R結合の解離エネルギーを計算し直して, ケイ酸塩, ゲルマン酸塩及びリン酸塩相互に比較した. 結合解離エネルギーの物理的意味について結合解離過程を表している熱化学サイクルに基づいて説明した.
The first stage of the M-center coloring has been investigated in europium-doped NaCl and KCl at room temperature, as a function of impurity concentration in the range 30–800 ppm. The results indicate that the M-center production can be described by a statistical process in which the relationship M=K1F2 is obeyed. It…
An important internal friction phenomenon has been revealed on a non-stoichiometric (Al2Oa)3.5, MgO spinel single crystal. This anelastic effect is the greatest ever reported on an oxide compound. A composition dependence investigation was carried out with the aim of identifying the responsible atomic mechanism.
Deboronization behavior during austenitizing of 0.2%C-0.85%Mn boron-treated steels was investigated in the various atmospheres. A considerable amount of boron removal was observed during the heat treatment in the air, and neither an atmosphere of argon nor a nickel-plating on metal surfaces had detectable effect in pr…
Electro-chemical methods to determine corrosion rate under paint films were reviewed. Some experimental results by current interrupter method were described. Some comments were also made on other techniques for studying under-film corrosion.