Materials Literature
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Abstract Zwei der drei ultrarotaktiven Eigenfrequenzen von Titanaten können angenähert beschrieben werden als verursacht durch eine antisymmetrische Schwingung einer OTiO‐Kette und durch eine Schwingung des Erdalkaliatoms gegen acht seiner zwölf nächsten O‐Nachbarn. Aus den beobachteten Spektren werden folgende Kraf…
Abstract An investigation is made of the process by which the activator Mn is incorporated in CaS and SrS, by studying its dependence on activator concentration, flux addition and firing atmosphere. The dependence of the amount of Mn incorporated during the firing on that present before firing was investigated using a…
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Abstract The heterogeneous polymerization of acrylonitrile in tetrahydrofuran by chain transfer catalysts: monosodium anthracene, disodium anthracene, sodium naphthalene, monolithium anthracene, and lithium naphthalene was investigated. The free radical formed in the initiation was found to participate in the polymeri…
B. R. Phillips and D. Taylor, J. Chem. Soc., 1963, 5583 DOI: 10.1039/JR9630005583
The paper gives the mathematical formulation, and indicates the mathematical solution, of the problem of the dynamic behaviour of a transformer winding under axial short-circuit forces, certain basic physical assumptions being made initially. Various practical tapping arrangements are considered so that there may be e…
Following a previous report “Studies of the Glass-formation Range of Borate Systems” (This Journal, 69, 282 (1961)), we studied the glass-formation range of silicate systems. Although silicate glasses have long been used, sufficient systematic studies of the glassformation ranges of silicate systems have not yet been…
C. Aaron and C. C. Barker, J. Chem. Soc., 1963, 2655 DOI: 10.1039/JR9630002655
On a mesuré les sections efficaces de formation des isotopes 224, 225, 226, 227, 228 de l'actinium dans le thorium 232 bombardé par des protons de 30 à 120 MeV. Dans le domaine de basses énergies (30 à 80 MeV) la formation des Ac est attribuable aux processus (p, αxn) .
Abstract CaF 2 and SrF 2 crystals are doped with trivalent yttrium ions, and X‐irradiated, which results in similar coloration spectra for both substances. The bands seem to satisfy MOLLWO 's relation v a 2 = const, since the SrF 2 bands are shifted to longer wavelengths compared with the corresponding CaF 2 bands. Th…
Films were obtained by anodic treatment of Al, Mg, Ni, Fe, Zn, Bi, Cd, Co, and Cu in and Al, Bi, Cd, Cu, and Zn in . A formation voltage of 30v was applied for 10 min in all cases except Al in where the maximum formation voltage was 100v. The anodic films were studied by electron diffraction and chemical analyses. Fil…
Abstract Bei Elektronenbestrahlung von Metallen interessiert der totale Wirkungsquerschnitt σ d ( E ) ( E Elektronenenergie) für Stöße, die zu einer bleibenden Verlagerung der von Elektronen getroffenen Atome (Primäratome) führen. σ d ( E ) wird experimentell aus Widerstandsmessungen bestimmt und kann theoretisch bere…
The diffusion coefficients of hydrogen in β‐zirconium were calculated from experimental hydrogen sorption curves. The results were D ( cm 2 / sec ) = 5.32 × 10 − 3 exp ( − 8320 / RT ) , (760°–1010°C). This relationship was independent of hydrogen concentrations (to 41 a/o H) and oxygen concentrations (to 4.2 a/o O) in…
Abstract Neutron powder diffraction patterns are measured at 50°C and liquid nitrogen temperature. The crystal structure is defined as D8 8 (space group P6 3 /mcm), in agreement with CASTELLIZ 's data [2]. It is found that the atoms in the 4 (d) and 6 (g) positions have magnetic moments of (3 ± 0.1) and (2 ± 0.1) Bohr…
Melting relations in the systems CaO‐manganese oxide and MgO‐manganese oxide in air have been determined at temperatures up to 1705°C. In the system CaO‐manganese oxide four crystalline phases have stable existence in equilibrium with liquids: lime (approximate composition CaO‐MnO), spinel (approximate composition Mn…
It has been demonstrated that the use of solvent additives can substantially increase the rate of radiation-induced graft polymerization in the systems polyethylene–styrene, polypropylene–styrene, polyvinyl chloride–styrene, nylon–styrene, polyethylenemethyl acrylate, polypropylene–methyl acrylate, nylon–methyl acryla…
The mean free paths and attenuation lengths of hot electrons and holes in metals are calculated by Morte Cario methods. The results are compared with experimental results for electrons in Au,-Ag, Cu, and Pd and holes in Au. (T.F.H.)
Abstract
J. F. Duncan and P. W. R. Wigley, J. Chem. Soc., 1963, 1120 DOI: 10.1039/JR9630001120
The cations Na, K, NH4, Ca, Mg, Mn, and, in certain instances, Ba, Sr, and Pb combine with the anion SO4 to form 58 mineral species. Slightly more than half are hydrous, and several contain Cl, F, or CO3. Infrared absorption spectra of most of the above sulfate s have been obtained with a split beam infrared spectroph…