Materials Literature
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Abstract Partially polarized luminescence is observed for Ga + , In + , and Tl + centres in alkali halides of CsCl‐type structure at liquid nitrogen temperature. The symmetry of excited Ga + , In + , and Tl + centres is established to be tetragonal in the most crystals investigated. The symmetry of Tl + centres in CsI…
Abstract A novel and simple fiber formation process has been developed to fabricate aromatic polyoxadiazoles. The aromatic copolyoxadiazole solution prepared from terephthalic acid, isophthalic acid, and hydrazine sulfate in fuming sulfuric acid was utilized directly as spinning solution and was successfully wet‐spun…
The preparation and physical properties are reported of a number of new binuclear µ-nitrido-complexes of osmium and ruthenium, of the form [M2IVNX8(H2O)2]3–(M = Os or Ru; X = Cl or Br); [Ru2N(NCS)8(H2O)2]3–; [Ru2N(NO2)6(OH)2(H2O)2]3–; [Os2N(NH3)8X2]3+(X = Cl, Br, l, NCS, NO3, or N3); [Ru2N(NH3)8X2]3+(X = Cl, Br, or NO…
The single-crystal polarised electronic and e.s.r. spectra of dichlorobis-(2-methylpyridine)copper(II) have been measured. The single-crystal g-values correlate with the monomeric local copper(II) co-ordinate axes and not with the co-ordinate axes of the dinuclear copper(II) species; they suggest a dx2–y2 ground state…
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Abstract The production of dry matter and the uptake of nutrients by corn ( Zea mays L.) from soil adjusted to different levels of salinity with a mixture of salts were evaluated and compared with results obtained with barley ( Hordeum vulgare L.). Soil salinity levels ranging from EC values of 0 to 16 mmhos/cm of the…
Recent developments in the thermochemical data for the condensed oxide phases and volatile oxide species for the refractory metals has made possible an analysis of the several types of high temperature oxidation processes. The analyses show the following factors to be important: (1) the presence or absence of oxide fi…
An electron microscope investigation has been conducted of a thin twin intersecting an existing coherent twin boundary (CTB) in copper. The twin crystallography and dislocations associated with it and its interaction with the CTB have been experimentally determined. It appears that when a twinning dislocation intersec…
Dans les orthocobaltites de terres rares TCoO3, de structure pérovskite déformée, l'ion Co3+ est diamagnétique ; pour T = Tb, Dy, Ho un ordre antiferromagnétique de type AG s'établit à très basse température : on précise le mécanisme de métamagnétisme, la variation de la température de Néel avec la direction d'un cham…
Steady‐state chemical potential profiles in a solid electrolyte under open‐ circuit and ion‐blocking conditions, may be obtained by balancing the steady‐ state flux at points inside the electrolyte. Steady‐state oxygen chemical potential profiles inside a scaling layer of thoria and inside yttria‐doped thoria specimen…
The observed fundamentals of the cubic form of As4O6(arsenolite) are unambiguously assigned from single-crystal measurements. Data are also reported for the isomorphous senarmonite (Sb4O6) which (in the mineral) contains small quantities of the orthorhombic polymorph valentinite (Sb4O6). The gas-phase Raman spectra of…
Lithium thallium tartrate monohydrate is ferroelectric below 12 ± 0.1°K. Contrary to earlier measurements, the true initial permittivity shows a peak at the transition temperature. Dielectric measurements suggest the transition to be second order. Below T0 there is evidence of a domain wall contribution to ε which per…
A model of the energy transfer between Yb3+ and Er3+ in LaF3 which explains the efficiency and time dependence of the conversion of infrared excitation to visible emission in this material is presented and analyzed. It is concluded that in La0.86Yb0.12Er0.02F3 the probability of an excited Yb3+ ion transfering its ene…
The metal atom in the triclinic tin(II) phthalocyanine is 1·11 Å out of the plane of the four co-ordinating nitrogen atoms; the phthalocyanine moiety is significantly non-planar.
Abstract The thermal degradation of a bisphenol A‐based epoxy resin (EP 274) cured with 4,4′‐diaminodiphenyl methane (DDM) and with phthalic anhydride (PA) was studied using a radiochemical pyrolysis gas chromatography technique. Conclusive evidence for some of the degradation mechanisms of these resins was obtained b…
Preliminary results for Ca2Nb2O7 indicate a new type of structure for an A2B2O7 compound containing BO6 octahedra. This structure, which is distinct from the pyrochlore and weberite types, contains parallel slabs each having a distorted perovskite configuration, but arranged with a notable lack of Nb–O–Nb links betwee…
Optical and electron energy-loss data for aluminum between 0.04 and 72 eV have been critically analyzed and used to test the validity of models for ∊(ω), the complex frequency-dependent dielectric constant. Experimental data and models for ∊(ω) can be effectively compared by use of a nonlinear least-squares computer p…
The imbibition of salts by sodalite and cancrinite during their hydrothermal formation from kaolinite has been studied. Isotherm contours recalling those of Langmuir's isotherm were observed in sodalite for NaCl, NaBr, NaClO3, NaClO4, and Na2CO3. These results have been interpreted in terms of a Donnan equilibrium, in…
Experiments are described in which aluminum samples, covered with a porous oxide layer by anodization in oxalic acid, are subsequently re‐anodized in boric acid ("forming"). The experimental techniques employed combine standard voltage and current measurements with gravimetric and optical methods for film thickness de…
Various magnetic properties of one dimensional antiferromagnet Cu(C6H5COO)2·3H2O were investigated by means of magnetic susceptibility, magnetic torque, NMR, and ESR measurements. The results show that this compound is one of the best one dimensional antiferromagnets known at present. An intrachain exchange interactio…