Materials Literature
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On the basis of recent optical and EPR work, it has been suggested that the ionized and thermally stable photochromic centers in Ca${\mathrm{F}}_{2}$ consist of one and two electrons bound at an anion vacancy adjacent to a trivalent impurity cation. For the ionized center, we have shown that the energy levels and wave…
Raman spectra of calcite, CaCO3 II, and CaCO3 III have been studied at various pressures as high as 40 kbar. Thirteen lines have been observed in the previously unreported spectrum of CaCO3 II and 20 lines are reported for the CaCO3 III spectrum. These spectra are compared with Raman spectra of aragonite, KNO3 III, an…
Etch-decoration reveals that the rate of removal of carbon atoms exposed at monolayer steps on graphite surfaces is very different from the rate of removal, under identical conditions, at multilayer steps. At 1113 degrees K and a pressure of 1.33 newtons per square meter of oxygen, the rate of oxidation (along the lay…
Nonhindered aromatic α-dicarbonyl molecules show abnormal spectroscopic behavior when compared to other molecules containing carbonyl groups. Taking benzil as a typical example, its photoabsorption and emission spectra cannot be accounted for by the normal Jablonski scheme. The spectral data are consistent with a mech…
The eigenvalues λi of an Hermitian matrix A of order n satisfy the inequality ∑ i = 1n | λi | ≤ n1/2N, where N is the Frobenius norm of A. Let n and ν be, respectively, the numbers of atoms and bonds in the conjugated system of a hydrocarbon, and let E be the corresponding Hückel matrix. Then the Hückel π-electron ene…
Amorphous ice prepared under a wide range of conditions has a density, determined from its buoyancy in liquid oxygen, of 0.94+/-0.02 gram per cubic centimeter, the same as that of ordinary hexagonal ice, with no indication of the glassy superdense ice (2.32 grams per cubic centimeter) reported recently. The diffuse re…
The temperature dependence of the rotational displacement parameters below the second-order phase transitions in SrTi${\mathrm{O}}_{3}$ and LaAl${\mathrm{O}}_{3}$ at ${T}_{a}=105.5 \mathrm{and} 797$\ifmmode^\circ\else\textdegree\fi{}K is described by an exponent $\ensuremath{\beta}=0.33\ifmmode\pm\else\textpm\fi{}0.02…
The term fettling which constitutes the major part of finishing may be considered to include:
Na2S203・5H2O単結晶の成長速度を, 溶液流速および温度を変えて測定した。25.0℃における (100) 面の成長速度に対する溶液流速の影響は_で表わすことができた。mの値は溶液流速とともにわずかに変化するが, ほぼ1.3となる。また温度の影響は,r=7.70×1015 (△c) 1.30exp (-20400/RT),286°K≦T≦298°Kで表わすことができた。
Hereunder is presented a brief report of the tensile tests performed under hydrostatic pressure up to 2000kg/cm2 on specimens of zinc single crystals with various orientation. The load-elongation curves and the features of plastic deformation to fracture varied significantly in accordance with the crystal orientation.…
Nitrogen adsorption isotherms at three different but similar temperatures were determined on samples of microporous silicas prepared by a freeze–thaw technique. A maximum in the plot of the isosteric heat of adsorption against coverage was observed on all the samples investigated. It is suggested that the effect can b…
Studies were made on the effects of temperature on the formation and corrosion resistance of boehmite films on aluminum by treatments in aqueous sulution and water vapor. The experiments were conducted by measurements of the film thickness, electron microscopy, electron diffractiometry, X-ray diffractiometry, and corr…
The complex dielectric permittivity of ortho-, meta-, and para-chloroaniline has been measured at various temperatures at the wavelengths of 10, 3, 2, and 1 cm. For the first two compounds the measurements have been made in pure liquid from as well as in solutions in carbon tetrachloride at various concentrations. p-C…
分散アゾ染料の光退色の反応機構に関連して, オキシアゾベンゼンとフェニルアゾピラゾロン誘導体の光退色挙動をナイロンとポリエステルフィルム上において検討した。そしてこれらアゾ染料の光退色速度におよぼす置換基の効果を調べた。オキシアゾベンゼン誘導体ではこれら光退色の容易さは水酸基の置換位置と数に依存し, その退色速度は 2,4-ジオキシアゾ>>2-オキシアゾ>4-オキシアゾの順位となる。また, フェニルアゾピラゾロン系染料においてポリエステル上の光退色相対速度定数の対数値と第1成分のフェニル核内の置換基の Hammett 定数との間には負の勾配をもつ良好な直線関係がえられる。そしてエトロ基を有する染料では両系列ともナイロン上においてみ…
Abstract In the course of investigating a special slurry problem in the Na 2 SO 4 production metastable double salts of calcium sulphate and sodium sulphate were detected (Emons, Stegmann). In this paper it is reported on the properties of these compounds and their decomposition products, determined by microscopic, X‐…
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The composition dependence of some physical properties of Cabal and Babal glasses is discussed for the purpose of elucidating the role of aluminum ion in the structure of alkaline earth aluminoborate glasses. To interpret the experimental results on the basis of the glass structure, three rules are assumed about inter…
Data are reported from experiments performed to measure thermal expansion of uranium carbide up to the meltin, point, the expansion accompanying the transition from solid to liquid, and thermal expansion in the liquid phase. The thermal expansion of the tantalum carbide crucibles, used to hold the uranium carbide spec…
A thermodynamic analysis of the open‐tube chemical vapor transport of ZnO using the reaction of Zn and H 2 O has been attempted, assuming a simple reaction model for Zn and H 2 O vapor phase species. Based on this analysis, computer data have been derived to show variation in ZnO vapor phase content as a function of t…
Temperature and strain rate dependences of yield stress in purified pure iron and Fe-Cr alloys, were studied mainly by compression tests in the ranges of -196-300°C of temperature and 10-5-10-2sec-1 of strain rate.Relations between temperature (T), strain rate (ε) and frictional stress (σt), were established in the fo…