Materials Literature
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Evidence is presented which shows that columnar grains can be induced to grow in high‐density sintered uranium dioxide specimens by applying a steep temperature gradient at temperatures above 1700°C but below the melting point of 2800°C. Columnar growth apparently is a result of the migration of large transverse voids…
Electrode potentials of were measured in solutions containing fixed amounts of ions or ions, as a function of p H. Oxygen overvoltage and ease of electrochemical reduction are correlated with anion adsorption and true surface area of the two oxide modifications. A method for synthesis of by chemical means is described…
Abstract The stress cracking of polyethylene was studied under various experimental conditions, and the importance of the effect of both crystallinity and molecular weight of the polymer was established. Many of the variables were investigated, such as the thermal pretreatment of the sample, temperature of the sample,…
The characteristic electron energy loss spectra of the alkali halides LiF, LiCl, NaF, NaCl, NaBr, NaI, KF, KCl, KBr, KI, RbCl, CsBr and CsI, were measured using primary energies of 800 eV and 1500 eV. In each spectrum a peak due to the excitation of the valence electron plasma oscillation is observed. There is good ag…
Abstract Thin foils of pure gold (99,999%) were quenched into water from 700 to 1000 °C. Also foils of various purities (impurity concentrations up to 0.2 atomic percent Cu) are cold‐rolled at temperatures below −40 °C, and the recovery of the electrical resistivity studied between −40 °C and + 300 °C. Fast quenches f…
The reaction of gallium with quartz to produce gallium suboxide, , and silicon is shown by equilibrium calculations to be a mechanism by which gallium arsenide can become contaminated with silicon, and possibly oxygen, when synthesized in quartz systems. The contamination of gallium arsenide with silicon by this react…
Some of the important factors that affect the degree of reproducibility of desired dimensions, flatness, and surface finish of chemically etched silicon have been investigated. The etching rate of single crystal silicon in hydrofluoric and nitric acids was studied as a function of the ratio of the concentrated acids,…
Summary Droplets of concentrated whole milk foam have been dried in a standard spray dryer. This has been done by incorporating nitrogen gas into the concentrate at high pressure prior to atomization. The resultant powder has excellent dispersibility properties and can be produced at rates in excess of those obtained…
Nickel electrodeposits, of various thicknesses, were prepared from Watts' baths containing several addition agents to study the development of the surface structure. By electron‐microscopic examinations of replicas, thin films, and electrolytically thinned bulk metal the reasons for the formation of several structural…
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Kinetics and mechanism of the reaction between nickel and sulfur vapors were investigated in the temperature range 480°–640°C under atmospheric pressure. The sulfurization of nickel has been found to follow, under these conditions, the parabolic rate law. The activation energy of this process amounts to 22 kcal/mole.…
The temperature dependences of tetragonal-cubic phase transition of Co–Mn manganites are given; this transition is shown to be of the 1st order. The phase diagram in the usual chemical meaning is shown. The cation distribution of the Co–Mn oxide spinel is measured by Fe–Kα radiation; Mn ions tend to occupy B-site pref…
The structures of praseodymium oxide phases of composition PrO1.83, PrO1.81, PrO1.78, PrO1.71, and PrO1.69 are discussed in terms of the structures of PrO2.00 and PrO1.50 (C and A types). The way in which the existence of these several stable structures are mirrored in the physical and chemical properties is discussed.
The crystal structure of BS 2 type, in relation to B8 1 type, is discussed with the assumption of covalent bond between the dissimilar atoms in the honey-comb layer lattice of this structure. The covalent bond is interpreted in terms of hybridized orbitals. This concept explains the stability of the crystal structure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE INFLUENCE OF CHEMISORPTION OF OXYGEN ON THE ELECTRON SPIN RESONANCE OF ZINC OXIDER. J. KokesCite this: J. Phys. Chem. 1962, 66, 1, 99–103Publication Date (Print):January 1, 1962Publication History Published online1 May 2002Published inissue 1 January 1962https://pubs.acs…
Indexed X-ray powder diffraction data, including visual intensities, observed glancing angles, measured and calculated interplanar spacings, and indices of the reflecting planes, are given for almost 300 minerals. Nearly all native elements, sulfides, sulfosalts, and opaque oxide minerals, and silver and mercury halid…
G. Booth and J. Chatt, J. Chem. Soc., 1962, 2099 DOI: 10.1039/JR9620002099
For a ferroelectric crystal, the rate of change of polarization with temperature is large, especially close to the Curie point where a phase transition occurs. Thus, a change of polarization due to an incident radiation flux gives rise to a large pyroelectric voltage output. The ``minimum detectable power'' Wm is calc…
A theoretical study has been carried out of the eight non-degenerate optical vibrations of $\ensuremath{\alpha}$ quartz including the problem of their infrared and Raman intensities. The investigation consists of three parts: First, the atomic motions and frequencies are calculated on the basis of a valence force mode…
クラフトパルプエ業廃液よりpHによってチオリグニンの分別沈殿を試みた。沈殿剤としては, pH9以上の領域ではNaHCO3飽和溶液を使用し, それからpH7まではCO2を, 酸性領域では, 塩酸を使用して, 合計10フラクションに分別した。次に各フラクションのリグニン中の二三の官能基の量を比較したところ, 沈殿pHが低下するにつれて,(1) フェノール性水酸基およびカルボキシル基は, 漸次増大するが, 後都の増加率は, 前者に比して著しく大きい。(2) カルボニル基は, 漸次減少するが, 特に酸性フラクションでの低下は著しい。(3) グアヤシル基は, 第1フラクション (最高pHフラクション) のみ若干低いが, 他のフラクションでは…