Materials Literature
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A new numerical method is presented for simultaneous smoothing, desmearing and Fourier transformation of X-ray and neutron small-angle scattering data. The method can only be applied to scattering curves from dilute particle systems, i.e. for scattering media whose distance distributions are zero beyond a certain valu…
A survey is given of the physical properties, composition and crystal structure of intermetallic compounds formed between rare-earth elements and 3d transition elements. Apart from binary compounds the results of pseudobinary series are also considered. The magnetic properties determined by the exchange interactions i…
The basic theory relating to the design of reinforced concrete beam-column joints is reviewed and extended. In particular, the theory of an alternative joint detail using bond plates is developed.
For pt.I see ibid., vol.7, p.2023 (1974). Polycrystalline Tb x S, Tb x Te and Ho x Te (0.85<or=x<or=1) with NaCl structure show antiferromagnetic FCC II order. The magnetic moments of Tb x S and Ho x Te are found to be oriented similarly to Tb x Se, and equivalent monopnictides, and correspond to theoretical predictio…
The structural and magnetic properties of the system V1-xAlxO2+or-y have been investigated by X-ray diffraction, NMR, magnetic susceptibility and EPR measurements. The existence of two insulating intermediate phases M2 and T between the insulating M1 and the metallic R is confirmed. The effect of oxygen non-stoichiome…
The authors have extended to lower temperatures and frequencies, a recent dielectric study of hydroxyl doped vitreous silica. At given frequency the dielectric constant has a minimum at a temperature proportional to f 1/3 while at given temperature the loss angle has a maximum proportional to T 0.28 at a frequency pro…
Abstract Sulfuration of natural rubber (NR) by the binary accelerator 2‐mercaptobenzothiazole (MBT) and diphenylguanidine (DPG) both in presence and in absence of ZnO and stearic acid with or without dicumylperoxide (DCP) was studied in detail. It was observed that the rate of decomposition of DCP in presence of both…
Abstract The polyamic acids from pyromellitic dianhydride, benzidine (B) and hydrazine (H) were prepared and characterized by intrinsic viscosity measurements in dimethylformamide (DMF) solutions. The hydrolytic stability of these polymers was determined by keeping the DMF solution in presence of air at room temperatu…
Abstract Films prepared from emulsion polymerized poly(vinyl chloride) were subjected at 0°C to accelerated photodegradation in air using a weatherometer. Photooxidation and scission of the main chain took place but dehydrochlorination or formation of polyenes was not observed. The absorption of the carbonyl group ind…
Abstract Crystal structure determinations of two metal‐ion complexes with noncyclic ionophores are reported: (i) CaCl 2 complex of N,N,N′,N′‐Tetrapropyl‐3,6‐dioxa‐octane diamide, space group Fddd, a = 14.659, b = 19.616, c = 33.173 Å; (ii) MnBr 2 complex of N,N,N′,N′‐Tetrapropyl‐1,2‐cyclohexylenedioxydiacetamide, spac…
Reversible photochromic reactions can be coupled to carrier-mediated transport processes in membranes to bring about the separation or concentration of selected permeants. Carbon monoxide has been pumped against of fourfold concentration gradient by differentially illuminating a hemoglobin membrane. The extent of conc…
The structural first-order phase transition of the layer structure (CP2H5NH3)2CdCl4 at 216 K is studied by single-crystal X-ray diffraction. The low-temperature phase (OLT) belongs to the space group Pcab, whereas the room-temperature phase (ORT) belongs to the space group Bmab. In both structures, the hydrogen atoms…
A new film-bulk method is used for the measurement of the depth distribution of current density and absorption of incident primary electrons penetrating into solid targets of Be, Al, Cu, and Au, As well the depth dependence of the generation of secondary electrons in the interior of the targets is determined experimen…
Energy distribution curves (EDC's) of photoelectrons emitted normal to the surface have been measured for the (0001) and (10\ifmmode\bar\else\textasciimacron\fi{}10) single crystal faces and for evaporated polycrystalline films of cobalt. Incident photon energies of 11.83, 16.85, and 21.22 eV were used. The EDC's of t…
The effect of hydrostatic pressure on the Raman-active ${A}_{g}$ and ${B}_{3g}$ modes in the IV-VI orthorhombic layer compounds GeS and GeSe is reported. The pressure coefficients and corresponding mode Gr\"uneisen parameters of the rigid-layer modes are found to be an order of magnitude larger than those of the rocks…
Using a percolation construction we evaluate the temperature dependence of the phonon-assisted dc hopping conductivity of a model appropriate to a class of anisotropic quasi-one-dimensional conductors in which the electronic states in the vicinity of the Fermi level are localized because of intrinsic and or extrinsic…
The relationship between the Mulliken electronegativities of the elements and the work functions of metals has been investigated, and it has been found that these two are equal. This investigation has been extended to binary nonmetals using a relationship proposed by Nethercot with good success so that a general proce…
The thermal conductivity and thermoelectric power of an inhomogeneous material subjected simultaneously to gradients of temperature and electric potential are accounted for in terms of an effective-medium theory as well as by numerical simulations in cubic networks with correlated bonds.
The complex dielectric constant $\ensuremath{\epsilon}(\ensuremath{\omega})={\ensuremath{\epsilon}}_{1}+i{\ensuremath{\epsilon}}_{2}$ for graphite is derived in the energy range 1 to 0.001 eV by Kramers-Kronig analysis of reflectance data with a suitable extrapolation of the curve to $R\ensuremath{\rightarrow}1$ for $…
Drift velocity for holes in high-purity Ge ($|{N}_{D}\ensuremath{-}{N}_{A}|<{10}^{11}$ ${\mathrm{cm}}^{\ensuremath{-}3}$) has been analyzed for a wide range of temperatures $8\ensuremath{\le}T\ensuremath{\le}220$ \ifmmode^\circ\else\textdegree\fi{}K and fields $1\ensuremath{\le}E\ensuremath{\le}{10}^{4}$ V/cm appli…