Materials Literature
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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.
The problem of determining the level and distribution of stress and the accompanying deformation in the elasto-plastic regime is made more difficult for the designer because of the inherent uncertainty about the existence or absence of the elastic-plastic boundary in the considered material body.
When o-chlorobenzoic acid (OCBA) is recrystallized from toluene solution containing benzoic acid (BA) as impurity, BA co-crystallizes with OCBA because of formation of solid solution. The distribution coefficient of BA between crystal and toluene solution was estiamted by the differential crystallization method. The c…
Abstract Optical absorption has been used to study the impact damage in MgO and MgO:Li single crystals. The results are similar to that obtained in compressed crystals, except in MgO:Li with stable Li° defects, in which the impacts do not produce an increase of the 5.7 eV absorption band.
The tetrahedral units constituting the anionic network of silicate melts form a population containing five species the relative abundance of which depends on the degree of neutralization of the silica. These species may be enumerated by the probability calculation. In the absence of an electrostatic repulsion effect,…
Anomalies are observed in measurements of electromotive force and electric conductivity measurements of solid oxide electrolyte cells involving Cr(s)-Cr2O3(s) electrode. Transformation in Cr(s)-Cr2O3(s) system at about 1 653 K is suggested to explain the anomalies mentioned above on the basis of measured temperature d…
MO-P2O5系ガラス及び結晶 (M=Mg, Ca, Sr) の3N HNO3水溶液中への溶解熱と組成との関係をP-Ob架橋結合解離熱の立場から組成領域0<MO+H2O/P2O5(=r)<1, 1<r<2, 2<r<3において検討した. 溶解熱より計算されるM(PO3)2ガラスの生成熱を用いて, アルカリリン酸塩ガラスにおけると同様にE(P=O)/E(P-Ob)=1.75及び2.0と仮定して, P-O架橋結合, 非架橋結合エネルギー (E(P-Ob), E(P-Onb)) 並びにO-M-O結合エネルギーE(OM) を求めた.
The manufacture of plastic containers for carbonated beverages from polymeric resins by stretch blow molding technology has rapidly grown in recent years. Due to the unique properties of PET, such as high strength, transparency, surface gloss, low permeability, light weight, and recyclibility, billions of carbonated b…