Materials Literature
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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…
Abstract Experiments on the hydration of 3CaO.Al 2 O 3 in a solution of Ca(OH) 2 in the presence of CaSO 4 .2H 2 O are described. An approximate theoretical treatment of the retarded stage of this reaction is offered on the basis of water transport through a calcium hydrosulphatoaluminate (ettringite) layer on the 3Ca…
The low‐temperature oxidation of niobium in water vapor and in oxygen occurs by diffusion of oxygen into the metal and formation of and on the surface. forms a porous scale on , growing linearly from the oxide‐oxide interface. Solution of oxygen in the metal and the growth of on niobium are believed to be diffusion co…
A brief account is given concerning the theoretical framework of the molecular orbital treatment of crystal field theory. Indirect and direct experimental evidences of electron delocalization are summarized. A historical survey is given of the theoretical treatment of cubic crystal field splitting. Finally, a molecula…
Abstract An Hand von röntgenographischen Untersuchungen, insbesondere mit der UNICAM‐Hochtemperaturkamera sowie mit Hilfe differentialthermoanalytischer Untersuchungen und Kapazitätsmessungen konnte nachgewiesen werden, daß die thermische Zersetzung aller Ammoniumparawolframate zum WO 3 zunächst über einen röntgenamor…
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In a previous paper, studies of the various physical properties of molten lead silicates were reported. Observation of the effects of the structure sensitive properties of lead silicate melts resulting from addition of various metallic oxides as a third element should be of great importance in order to understand the…
N. T. Notley, Trans. Faraday Soc., 1962, 58, 66 DOI: 10.1039/TF9625800066
Experimental methods are described for studying rates of formation of soluble and insoluble corrosion products of copper exposed to water containing dissolved oxygen and carbon dioxide. Coulometric reduction indicates that the films formed on copper under these conditions are predominantly of cuprous oxide. Generation…
The oxidative dissolution of copper in acidic, aqueous media is limited in rate by the presence at the metal‐solution interface of a growing film of cuprous oxide. A brief survey of what is known about the nature and modes of growth of such films provides the basis for a "duplex film" model of the corroding copper sys…
The weight gain of Zircaloy‐2, ‐3, and low nickel Zircaloy‐2 during water and steam corrosion is shown to go through two or more repetitive cycles. The evidence indicates these weight gain curves truly represnt the corrosion kinetics. Several corrosion mechanisms are considered in the light of these kinetics. While no…