Materials Literature
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Abstract Polyphenylene‐1,3,4‐oxadiazoles have been prepared from benzenedicarboxylic acids or their derivatives and hydrazine by solution polycondensation in fuming sulfuric acid or polyphosphoric acid. These polymers were characterized by good thermal stability, and the molecular weights attained were high enough for…
Absorption spectra of aqueous solutions of TcX 6 - and ReX 6 - (X = F, Cl, Br, I) are measured between 8 000 and ∼ 50 000 cm -1 and theoretically discussed. The electron transfer spectra indicate the optical electronegativity x opt = 2.25 for Tc (IV) and 2.05 for the less oxidizing Re (IV). The spectrochemical paramet…
Both the dust/fog and IEC methods have been used to investigate the resistance to surface tracking and erosion of a range of synthetic insulating materials under polluted conditions. The relative merits of these test methods are discussed, and reasons given for preferring the dust/fog test. Consideration is also given…
Abstract Absorption, excitation, and and emission spectra of KCl, KBr, and KI single crystals doped with Cu, are investigated in the spectral range from 200 to 1200 nm at temperatures from 77 to 700 °K. The absorption and excitation spectra of KBr:Cu at 77 °K show three bands centred at 210, 235, and 265 nm. Since the…
Crystalline Ag~O. 4B203 has been prepared and fotmd to be monoclinic with unit-cell dimensions a=6.5500-003, b=8-671 0.004, c=17.511___0.008 A; fl=90 18'6'.
Abstract The mechanism of slip in copper crystals with extraneously deformed surfaces was investigated using an etch pit technique. Some suggestions are made as to the deformation of crystals with hard surface layers. Slip in crystals oriented for multiple glide and in polycrystals is also discussed. Experiments of th…
T. R. Meadowcroft and F. D. Richardson, Trans. Faraday Soc., 1965, 61, 54 DOI: 10.1039/TF9656100054
Abstract Die Lichtabsorption der Mischkristalle Mg 1–x Ni x O wird im Spektralgebiet zwischen 4000 und 28 000 cm −1 untersucht. Eine Deutung der beobachteten Depression der Racah‐Parameter B und C mit steigendem x und der anomalen Intensitätsverschiebungen innerhalb des Bandensystems bei zunehmender Ni 2+ ‐Konzentrati…
Abstract Absorption spectra of Ag + doped NaCl, KCl, KBr, and KJ are measured at low temperatures in the spectral range from 6.8 to 4.4 eV. The fine structure of the Ag + bands and their temperature dependence are investigated. The oscillator strenghts at low temperatures are in the order of 10 −3 . These Ag + absorpt…
Profiles are obtained for gold diffusing into silicon wafers of finite thickness. The profiles do not obey Fick's law. The effects of shallow diffusions of phosphorous and boron on the gold concentration are described; gold concentration is higher in areas of high phosphorous concentration.
Abstract Tracer diffusion measurements in β‐titanium are reviewed and new data presented for solutes Sc 46 , Sn 113 , and P 32 . All Arrhenius plots are curved and give unusually low activation energies and frequency factors. Various explanations are outlined and it is suggested that monovacancy diffusion dominates bu…
Aiming at a better understanding of still vague conduction processes in NiO, extensive measurements of the electrical resistivity ρ were made between 300 and 1020°K on Li x Ni (1- x ) O single crystals epitaxially grown on the MgO substrates, where x from zero up to 0.065 was controlled by diffusion method. The main r…
The evidence for Snoek's model of interstitial position and diffusion in bcc metals is reviewed in the light of recent calculations. Other models are equally tenable in many instances, on the available evidence, if the internal friction relaxation strength associated with the tetrahedral sites is appreciable. To inves…
Abstract An aufgedampften amorphen Te‐Schichten wurde die Temperaturabhängigkeit der spezifischen Leitfähigkeit gemessen. Bei hohen Temperaturen (> 200 °K) ist die Eigenleitung mit Δ E ≈ 0,87 eV vorherrschend. Bei tiefen Temperaturen ergibt sich eine Störleitung, die sich durch Erwärmung auf relativ niedrige Temper…
The complete orientation distribution of the a and b crystallographic directions have been measured for a series of tubular extruded polyethylene films as a function of blow ratio. The use of pole figures as a means of representing orientation is emphasized and it is shown that the usual technique of using flat plate…
The phonon spectrum of reactor grade graphite is computed by means of the essentially exact root sampling technique for a sampling 47 788 points in an irreducible segment of the Brillouin zone. Measurements of the specific heat (over the range 100°—1000°K) are used to determine the force constants, resulting in good a…
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H. B. Gray, P. T. Manoharan, J. Pearlman and R. F. Riley, Chem. Commun. (London), 1965, 62 DOI: 10.1039/C19650000062
D. Dolphin, R. Grigg, A. W. Johnson and J. Leng, J. Chem. Soc., 1965, 1460 DOI: 10.1039/JR9650001460
R. A. Lidgett, E. R. Lynch and E. B. McCall, J. Chem. Soc., 1965, 3754 DOI: 10.1039/JR9650003754