Study of the surface and bulk hydroxyl groups of silica by infra-red spectra and D2O-exchange
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A Molecular Orbital Treatment of the Bonding in Certain Metal Atom Clusters
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Molecular Orbital Treatment of the Bonding in Certain Metal Atom ClustersF. A. Cotton and T. E. HaasCite this: Inorg. Chem. 1964, 3, 1, 10–17Publication Date (Print):January 1, 1964Publication History Published online1 May 2002Published inissue 1 January 1964https://pubs.a…
The Kinetics of Anodic Oxidation of Iron in Neutral Solution
Iron was anodically oxidized under both potentiostatic and galvanostatic conditions. It was found that the rate of film growth could be expressed by the over‐all equation where Q T is the film thickness, E the potential, and κ', β, and B are constants. A model is proposed based on a "place‐ exchange" mechanism in whic…
Neutron diffraction study on manganese telluride
A neutron diffraction study of manganese telluride has been made using powder specimen. The specimen has been carefully checked by high temperature X-ray analysis and has been proved to be free from MnO and MnTe2 which are apt to contaminate the specimen. This investigation has shown that the magnetic structure of MnT…
Development of the Electrochemical Theory Of Metallic Corrosion
Author explains in detail the kinetics of corrosion processes and gives a thorough study of their thermodynamical problems. He points out the factors which have influence on electrochemical corrosion. He investigates the role of cathodic inclusions concerning corrosion process in alloys and at the same time emphasizes…
Ferrimagnetic spiral configurations in cobalt chromite
Cobalt chromite, CoCr2O4, is a cubic spinel which is ferrimagnetic at low temperatures with a Curie point Tc ≈ 97 °K. The room temperature powder diffraction pattern on this material, corrected for temperature effects, shows that it is a normal spinel with an oxygen parameter equal to 0.38707 :f: .00005. At 4.2 °K the…
SOME ELEMENTARY PRINCIPLES OF POLYCRYSTALLINE MICROSTRUCTURE
This review is mostly concerned with the structure of inorganic polycrystalline materials on a scale much larger than the atom, but dependent upon the behaviour of atoms as its units. Our interest is chiefly in the shape of crystals, but there are two basically different types. There are those, of almost any shape, wh…
Dislocation distributions in deformed copper single crystals
Dislocation etch pit distributions and slip lines were studied on copper single crystals oriented for single glide and deformed in tension at 4·2°K. Slip lines on the cross slip plane were observed from the earliest stages of deformation and their character changed during the transition to stage II. The distribution o…
On the Nonbasal Slip in Magnesium Crystals
In order to determine the characteristics and controlling mechanisms of the nonbasal slip which is the secondary slip system of several hcp metals such as magnesium, tensile tests were performed on single crystals of high purity magnesium having a special orientation whose tensile axis is parallel to the (0001) basal…
Cut growth and fatigue of rubbers. I. The relationship between cut growth and fatigue
Abstract The relationship between the cut growth and fatigue failure of natural rubber vulcanizates under repeated loading is examined. The cut growth behavior has been investigated using several types of test piece, and the results are shown to be consistent when interpreted in terms of the tearing energy concept dev…
388. Topochemistry. Part VI. Experiments on photochromy and thermochromy of crystalline anils of salicylaldehydes
M. D. Cohen, G. M. J. Schmidt and S. Flavian, J. Chem. Soc., 1964, 2041 DOI: 10.1039/JR9640002041
Collapse and Rebound of a Spherical Bubble in Water
Some numerical solutions are presented which describe the flow in the vicinity of a collapsing spherical bubble in water. The bubble is assumed to contain a small amount of gas and the solutions are taken beyond the point where the bubble reaches its minimum radius up to the stage where a pressure wave forms which pro…
385. Topochemistry. Part III. The crystal chemistry of some trans-cinnamic acids
G. M. J. Schmidt, J. Chem. Soc., 1964, 2014 DOI: 10.1039/JR9640002014
Contact Angle Hysteresis
The effect of roughness on the wettability of an idealized sinusoidal surface has been studied with a digital computer. The equations of Wenzel and of Cassie and Baxter are discussed in relation to the model. The heights of the energy barriers between metastable states of a drop are seen to be of utmost importance in…
Thermal methods of analysis
Contents include: Thermogravimetry. Thermobalances. Applications of thermogravimetry. Differential thermal analysis and differential scanning calorimetry. Evolved gas detection and evolved gas analysis. Spectroscopic, photometric, and optical thermal techniques. Miscellaneous thermal analysis techniques. This revised…
Hypersensitive pseudoquadrupole transitions in lanthanides
It is pointed out that the absorption lines of the lanthanides that are peculiarly sensitive to changes in the ligands are consistent with the selection rules for quadrupole radiation within the 4f shell. A number of sources for this sensitivity are examined, and it is concluded that it owes its origin to the inhomoge…
Crystalline forms of isotactic polypropylene
Abstract The X‐ray diffraction patterns of two crystalline forms of isotactic polypropylene, the β‐ and γ‐forms distinct from the α‐form described by NATTA 1 , have been recorded. The β‐form, previously observed only as single spherulites 6 has now been obtained in a well crystalline polymer, practically free of α‐for…
Kinetics of thermal degradation of char‐forming plastics from thermogravimetry. Application to a phenolic plastic
Abstract A technique was devised for obtaining rate laws and kinetic parameters which describe the thermal degradation of plastics from TGA data. The method is based on the inter‐comparison of experiments which were performed at different linear rates of heating. By this method it is possible to determine the activati…
Studies of phase transformations in nitrates and nitrites II. Changes in ultra-violet absorption spectra accompanying thermal transformations in the crystals
Abstract Changes in ultra-violet absorption spectra have been measured for nitrates and nitrites of the alkali metals and for ammonium, silver and thallous nitrates, in relation to thermal transformations in these solids. A gradual shift of absorption bands is found to accompany thermal expansion of all the crystals.…
Studies of phase transformations in nitrates and nitrites I. Changes in ultra-violet absorption spectra on melting
Abstract Ultra-violet absorption spectra of ions in crystals are sensitive to their environment of neighbouring ions. This fact is utilized to study melting processes in nitrates and nitrites, with particular reference to changes in the average shell of nearest neighbours around any ion, on passing from crystal to mel…