Stoicheiometric dimerisation of acrylonitrile to adiponitrile by a cobalt complex
G. Agnès, G. P. Chiusoli and G. Cometti, Chem. Commun. (London), 1968, 1515a DOI: 10.1039/C1968001515A
Materials Literature
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Kinetics of Hydrolysis of Single Crystal CaF[sub 2] from 1000° to 1120°C
The kinetics of the reaction were determined on single crystal specimens by a gravimetric technique in the temperature range from 1000° to 1120°C at water vapor partial pressures from 1 to 20 Torr. Paralinear rate behavior was observed; i.e. , the reaction rate, which is initially parabolic, eventually becomes linear.…
Inhibition of the thermal decomposition of ammonium nitrate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInhibition of the thermal decomposition of ammonium nitrateGeorge H. Madany and George. BurnetCite this: J. Agric. Food Chem. 1968, 16, 1, 136–141Publication Date (Print):January 1, 1968Publication History Published online1 May 2002Published inissue 1 January 1968https://pub…
Reaktionen zwischen Fehlstellen in Ionenkristallen
Abstract Festkörper liegen bei Zimmertemperatur im allgemeinen nicht im thermodynamischen Gleichgewicht vor. Dies gilt sowohl im Hinblick auf die thermische Fehlordnung als auch im Hinblick auf die von der Komponentenaktivität abhängigen Konzentrationen der Punktfehlstellen. Bei Änderung einer unabhängigen thermodynam…
The nature and properties of manganese violet
A new method for the preparation of manganese violet is reported and the formula confirmed as manganese(III) ammonium pyrophosphate by wet analysis, X-ray powder diffraction, infrared spectroscopy, thin-layer chromatography, and magnetic measurements. The thermal decomposition has been studied and thermogravimetric cu…
Les Diatomées fossiles des sédiments villafranchiens de Senèze (Haute-Loire, Massif central français)
Die fossilen Diatomeen aus dem Villafranchien bei Senèze (Haute- Loire) wurden bei einer Bohrung durch den Boden des alten Kratersees hindurch untersucht. 110 Meter ton-sandiger diatomeenführender Sedimente enthalten eine Süsswasserflora die aus 107 Arten und Varietäten besteht ; 5 Formen sind neu und sie werden in di…
Analysis of P32 and Ca45 Exchange Between Hydroxyapatite and its Equilibrium Solution
Abstract The isotopic exchange of P 32 and Ca 45 with hydroxyapatite was studied along its solubility isotherm. The solution was in a chemical equilibrium with the solid, thus, only isotopic exchange reactions took place in the system. Isotopic dilutions during the exchange process enabled the measurement of a compart…
Free Ion 4fn Levels of the Tetravalent Lanthanides. Fluorescence and Absorption Spectra of Cesium Dysprosium (IV) Heptafluoride
When a mixture of chloride or sulfate salts of cesium and dysprosium in a 3:1 mole ratio was treated with fluorine gas at 10-60 psig and 200°-350°C, the white Dy(III) starting material was converted to an orange compound with an empirical formula approaching Cs3DyF7. Fluorescence and infrared absorption spectra of flu…
New Test Techniques for Evaluating the Compatibility of Materials with Liquid Oxygen under Impact
The current drop-weight test methods for evaluating the compatibility of materials with liquid oxygen under impact are briefly discussed, with particular emphasis upon the characteristically poor repeatability of the “threshold value” impact sensitivity ratings yielded by these methods. It is pointed out that this tra…
Spectroscopic studies on derivatives of aluminium borohydride
The assignment of group frequencies in the i.r. spectra of derivatives of aluminium borohydride has been made by the use of aluminium borodeuteride. Variations in the spectra with the change of ligand are discussed. The properties of the compounds in solutions have been studied using 1H n.m.r. spectroscopy, and data o…
The unit cell dimensions of some alkali lead and alkali strontium halides
Abstract The unit‐cell dimensions of the compounds AB 2 X 5 with A = K, Rb or NH 4 ; B = Pb or Sr and X = Cl or Br have been determined. The alkali strontium chlorides are isostructural with the alkali lead chlorides and bromides.
The Effect of Clamping Stress Distribution on the Fretting Fatigue of Alpha Brass and Al-Mg-Zn Alloy
This investigation shows that below a certain value of the maximum pressure in the region of contact, fatigue cracks are not initiated. This critical value of the maximum pressure is lower the greater the area of contact. In alpha brass the rate of crack initiation increases with increasing values of the maximum press…
Effects of Particle Sizes of Carbide and Amounts of Undissolved Carbide on the Fatigue Life of Bearing Steel
The effects of carbide particle sizes and amounts of undissolved carbides in martensite matrix on the fatigue life and other properties have been investigated by using the SUJ 2 kind (JIS) of bearing steel having coarse particle carbides and fine particle ones, respectively, and low chromium steels with different carb…
Theory of the paramagnetic susceptibilities and anisotropies of copper( II ) ions in ‘tetrahedral’ environments
Paramagnetic susceptibilities have been calculated of ions with formal 2D ground terms perturbed by cubic and axial crystal-fields and spin–orbit coupling. They are critically compared with those computed from a basis set of orbitals restricted to the cubic field 2T2 ground state. Anisotropies are found to be particul…
The Current-Voltage Characteristics of Porous Anodic Oxides on Aluminum
Abstract not Available.
Polyisonitriles. I. Original structure and possible rearrangement of poly(α‐phenylethylisonitrile)
Abstract Several possible chemical structures for poly(α‐phenylethylisonitrile) are examined, and the structure is proposed for the polymer as it originally forms. The isolation of acetophenone from hydrolysates of the polymer suggests, although not conclusively, that the polymer may have undergone a tautomeric rearra…
Effect of domain-wall motion on power loss in grain-oriented silicon-iron sheet
Loss measurements and domain observations are presented for two types of grain-oriented 3%-silicon-iron sheet having widely differing domain sizes, in order to elucidate the origin of anomalous loss in magnetic materials. An alternative method is presented for separation of eddy current and hysteresis losses, which gi…
Magnetic Susceptibility and Nuclear Magnetic Resonance Studies of Transition-Metal Monophosphides
The magnetic susceptibilities of the transition-metal monophosphides TiP, ZrP, HfP, VP, NbP, TaP, and CrP were measured between 78° and 400°K. Susceptibilities ranged from − 0.70 × 10−6 cg/gm for TaP to 3.4 × 10−6 cg/g in CrP. Although small temperature variations of χ were observed in some cases, magnetic ordering wa…
Some Material Properties of Cerium Sesquioxide
三二酸化セリウム (Ce2O3) の材料物性は, 従来ほとんど検討されていなかった. Ce2O3は二酸化セリウム (CeO2) を水素中1400℃以上で還元して得られる. このようにして得た焼結体および粉末を用いて測定を行ない, 以下の結果を得た.(1) Ce2O3は極めて酸化しやすく, 空気中では室温でも酸化の進行が認められ, 加熱した場合は約60℃以上で急激に酸化しCeO2になった. また通常の真空中, アルゴン中, 水素中でも数100℃から1000℃の温度では, いくらか酸化して中間相 (CeO2-x) を生成した. アルカリには不溶, 酸にはゆっくり溶け, 水と反応して水和物をつくることが観察された.(2) Ce2O3の小…
Initiation of dry bands on polluted insulation
The loss of moisture and the initiation of dry-band formation on wet contaminated insulation has been studied by measuring the insulation resistance of the contaminated specimen as a function of the degree of contamination, relative humidity, applied voltage and time. Drying of the wet contamination consistently occur…