Materials Literature
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Previous measurements of the thermal conductivity of TiC, ZrC, and NbC by the present authors showed that at low temperatures the phonon‐electron scattering in these materials is strong and gives rise to an unusual temperature dependence of the lattice thermal conductivity. The Callaway analysis of those data is now e…
Tetrafluorophthalonitrile reacts with a variety of metals and metal halides to give halogenophthalocyanines. The reaction with zinc, zinc bromide, or zinc iodide gives zinc hexadecafluorophthalocyanine in good yield, but zinc chloride, iron(III) chloride, and aluminium chloride react to give mixtures of polychloropoly…
Abstract
Abstract
Polycrystalline copper of 99·99% purity has been deformed in tensile creep at a variety of strain rates and temperatures. The internal stress developed during creep deformation was measured by a modified stress-relaxation technique. The magnitude of the internal stress remains constant during steady-state deformation…
Boron co-ordination compounds of the type L,BH3(L = Me3N, Et3N, Py, and Et3P) and Me3N,BH2X (X = Cl, Br, and I) are shown to form hydrogen-bonded complexes with OH (MeOH, PhOH, and p-F·C6H4·OH) in carbon tetrachloride solution. These complexes appear to be formed via OH ⋯ BH3 and OH ⋯ BH2 interactions and are readily…
The electronic spectra of the octahedral Tecl_6^(2-) and TeBr+6^(2-) complexes are reported and assigned. \nThe s → p transition a_(lg)σ^* → t_(lu)σ^* gives rise to three spin-allowed bands in TeCl_6^(2-) (32,880; 34,480; 35,680 cm^(-1)) and TeBr_6^(2-) (28,470; 29,730; 30,850 cm^(-1)). These data are taken as evi…
Divalent europium was used as an activator in Ba‐Ca, Ba‐Sr, and Ca‐Sr orthophosphate and pyrophosphate compositions. Luminescence was observed in most of the compositions and spectral energy distribution measurements were made on all samples. Changes in the mixed cation ratios produced variations in emission band inte…
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…