Showing papers in "Materials Chemistry in 1982"

TL;DR: The usual assignments of absorption bands due to products of CO and CO2 reactive adsorption on metal oxide surfaces are also critically reexamined in this paper, where carbonate, bicarbonate and formate ions, and of CO2 in metal complexes are reported.

TL;DR: In this paper, the existence of quinone, aromatic ether, carboxylic acid and phenol groups on the surface of a graphitized carbon black (GCB), that is P-33 (2700°C).

TL;DR: In this article, the conductivity, Seebeck effect and magnetic susceptibility of the oxides La2−xA1+xCu2O6−x/2+σ (A = Ca, Sr) have been investigated.

TL;DR: In this paper, the Raman spectra of GexAsySz glasses have been studied in the ternary composition region of GeS2-As2-S. Dominant features of the obtained spectra were discussed and the structural units forming the disordered structural network were identified as: GeS4 tetrahedra, AsS3 pyramids, As-S-S S-As-As bent chains and Sn (n = 2-4) chain segments.

TL;DR: In this paper, the modifications of the EPR spectra with the increasing of V2O5 content are explained by the superposition of two EPR signals, one with a well resolved hyperfine structure typical for isolated vanadyl ions and one consisting from a broad line without structure characteristic for clustered ions.

TL;DR: In this article, the affinity decay rate in a closed isothermal system is studied in terms of classical and statistical thermodynamics and a general thermodynamic description of the reactions is provided, valid for reactions with diverse mechanisms.

TL;DR: In this paper, absorption-reflection Fourier transform IR spectroscopy was used to study the formation of chromate and acid chromate conversion coatings on aluminum and showed that the initial steps are similar but the mechanism of further coating formation depends on the chemical composition of the solution.

TL;DR: A simplified model for evaluation of the oxidation behavior of hot-pressed silicon nitride (HPSN) has been derived which accounts for the amount and type of grain boundary phase and for the composition at the Si3N4/oxide reaction interface as discussed by the authors.

TL;DR: A brief survey of electrochemical test methods available for testing the protective properties of paint and other organic coatings over metals in corrosive environments, so as to establish the reasons for choosing A/C impedance as a method for both basic research and routine testing work is given in this article.

TL;DR: In this paper, the adsorption of different alcohols has been studied by gravimetry and infrared spectroscopy, showing that the irreversibly and reversibly adsorbed quantities increase with alcohols basicity.

TL;DR: In this article, a method based on faradaic distortion was elaborated for measuring the rate of corrosion taking place under primers, and several primers used in practice were investigated in order to show the applicability of the method.

TL;DR: In this paper, the lattice parameter, a 0, oxygen parameter, u, and cation distribution for each spinel were determined by means of X-ray diffraction analysis.

TL;DR: In this article, the change in the corrosion resistance of amorphous alloys due to the improve in chromium content (0 to 14 atome %) has been investigated in 0.1 N H2SO4.

TL;DR: In this article, the most important problem of measuring powder resistivities is the separation of the contribution of powder particle cores and surfaces to the entire resistivity of the green powder pressing, before the heating process starts.

TL;DR: In this paper, the authors measured the open circuit potentials of four FeCr alloys of increasing Cr content in strongly aerated solutions of Cl−, Br−, I−, NO3−, SO4−−, WO4− −, CrO4 −−, and H2PO4− of varying molarities, till the attainment of steady state values.

TL;DR: In this paper, the results concerning the kinetic parameters of various silicon nitride film deposition processes were presented. And the effect of the following experimental parameters on the deposition rate was investigated: total gas flow rate, reactant gas concentrations, temperature of the substrate, etc.

TL;DR: In this paper, the selection and development of electrochemical test methods for the assessment and improvement of protective properties of coatings are performed currently at CSM, and examples of application of such test methods are given for the evaluation, research, development of tinplate for food containers and of painted steel sheets for car bodies.

TL;DR: In this paper, the glass formation and phase equilibria of the MnO-TeO 2 system in the 0 to 50 mol% MnO range were studied and the existence of four tellurites of manganese was confirmed and the nature of their melting was established.

TL;DR: In this article, the branching parameters of poly(butyleneterephthalate) with different degrees of branching were prepared by polycondensation of DMT, 1,4-butanediol (BD) and small amounts of 1,3,5-trycarboxymethylbenzene (TMT) from 0.005 to 0.015 (mol TMT)/(mol DMT).

TL;DR: In this paper, the authors analyzed some proposed equations for liquids which link several thermodynamic properties such as the isothermal compressibility factor with the surface tension of simple liquids, taking as their base both experimental data and the results obtained by the authors in a previous work on the significant structure theory.

TL;DR: In this paper, a reaction mechanism is proposed and the reaction conditions providing for highest catalytic activity and selectivity are outlined, and it is possible using the scheme, to explain why copper is not so suitable as a catalyst as silver.

TL;DR: In this paper, the inhibition of the corrosion of steel by homologous series of aliphatic amines and imidazolines was measured potentiokinetically, and the data obtained were correlated successfully to the hydrophobicity and the calculated parameter of these molecules by means of Hansch relationship.

TL;DR: In this paper, the absorption spectra of U 4+ ion in these glasses are similar to those reported for crystallized compounds and a comparison with homologous systems containing ThF 4 is made.

TL;DR: By cracking monosilane on heated nickel foils, a solid solution Ni-Si on the nickel was prepared and the behavior of so coated nickel, in oxygen, at high temperatures was investigated as mentioned in this paper.

TL;DR: In this paper, the corrosion resistance of chromate layers on zinc sheet was studied by electrode impedance measurements in 0.1 mol/1 NaClO 4 solutions, and a correlation was found between the inhomogeneity and corrosion protection of the chromate layer and impedance data measured at different spots of the specimen.

TL;DR: In this paper, the working mode of manganese dioxide as the active constituent of battery electrodes is described, and the complicated electric processes within the porous electrodes are treated concisely.

TL;DR: In this article, a semi-empirical relationship between the surface tension of simple liquids and the isothermal compressibility of simple liquid has been established, through the performance of several approximations.

TL;DR: In this paper, the tin telluride doped with varying amounts of iron has been synthetized and analyzed by electrical measurements (electrical conductivity and Hall effect), X-ray analysis and Mossbauer spectroscopy.

TL;DR: In this paper, a study of thermal degradation of polyvinyl chloride commercial samples is made by means of extrusion capillary rheometer, where samples are degradated under different conditions of temperature and shear stress.

TL;DR: In this paper, a diffraction procedure with electrons accelerated by superhigh tension over 200 keV proved to be suitable for examining the magnetic state of invar steel, and a formula has been proposed for analyzing the electron diffraction patterns perturbed by magnetic Lorentz force.