Materials Literature
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Abstract Besides mechanical blending and copolymerization there is a third possible way in which two polymers can be combined. Each polymer forms its own network, while both networks interpenetrate each other. There are no covalent bonds between the polymers. Such interpenetrating networks have been synthesized sequen…
The Voigt function provides a rapid and easily applied method for interpreting the breadths of diffraction profiles in terms of specimen defects and for studying absorption or emission spectra. In the past, approximate methods have usually involved the assumption that the constituent profiles are either Cauchy (Lorent…
Abstract Einkristalle der Titelverbindung mit x=14‐16 werden erhalten durch langsame Wasserdampfdiffusion in Lösungen von Fe3+ und Fe(CN)64‐ in konz. HCl.
Abstract The lamellar structure of certain polyethylene spherulites grown very slowly at low supercoolings (regime I crystallization) has been exposed by using new techniques. A highly regular texture is found whose main element is ridged sheets of alternating {201} facets, ca. 1 pm wide, growing outwards with b as sp…
Abstract Die während des thermischen Abbaus von PVC‐Pulver gebildeten Polyene reagieren leicht sochon bei etwa 100°C mit Sauerstoff. Die Anfangsgeschwindigkeit der Salzsäureabsplatung unter Sauerstoff ist bei den polyenhaltigen Proben wesentlich höher als beim ursprünglichen PVC. Die Geschwindigkeit der Salzsäureabspa…
The existence of a pressure-induced tricritical point in potassium dihydrogen phosphate was investigated by direct measurements of the spontaneous shear angle as a function of temperature using $\ensuremath{\gamma}$-ray diffractometry at pressures up to 2.15 kbar. High-resolution neutron diffractometry was applied to…
Measurements are reported on the AC and DC conductivity of evaporated films and single crystals of MoO 3 . In both cases a frequency-dependent conductivity is observed at low temperatures, and it is established that this is a true bulk property. A model is developed which shows that long-range potential wells surround…
The magnetic ordering of the anomalous antiferromagnet CeSb, which has a NaCl crystal structure, was determined in zero applied magnetic field by means of neutron diffraction investigations of single crystals and powder. Below the Neel temperature T N of (16.1+or-0.1)K, there exist six partially disordered magnetic ph…
Abstract The maximum of the d.c. conductivity of single crystals of the title compound ((TTT) 2 ‐I 3 ), grown by cosublimation, is shown to be at about 35K. The ratio of the b ‐axis (needle axis) conductivity at the temperature of its maximum (T m ≅ 35 K) and its value at T = 300 K (normalized conductivity σ (T m )/σ…
The deformation model considering a close interrelation and role of different processes has been proposed from systematic study of the superplastic flow in magnesium alloy. It is assumed that the superplastic flow of the alloy is caused by the cooperative operation of grain-boundary sliding (GBS) and some grain deform…
The important problem of disposal of nuclear waste in space is addressed. A prior study proposed carrying only actinide wastes to space, but the present study assumes that all actinides and all fission products are to be carried to space. It is shown that nuclear waste in the calcine (oxide) form can be packaged in a…
Investigation are made of kinetic characteristics of 〈111〉 tilt boundaries in aluminium bicrystals. Mobility of single boundaries driven by a constant driving force and Zn diffusion along these boundaries are studied. A comparative analysis is given of mobilities, diffusion coefficients, and activation barriers for th…
Transient photoconductivity has been used to measure the electron drift mobility in the ${c}^{\ensuremath{'}}$ direction of single-crystal naphtalene from 54 to 324 K. Below 100 K the mobility rises exponentially with decreasing temperature, an effect which we attribute to the onset of band-type motion limited by opti…
Using a self-consistent pseudopotential approach, band structures and charge densities have been calculated for trigonal Se and Te at hydrostatic pressures just below the transition to the metallic phase. The results are compared to zero pressure calculations and experimental data. Very good agreement between experime…
The Kirkwood theory of solutions of spherical ions is applied to aqueous solutions of macroions plus counter ions and to macroions in strong salt solutions. It is shown that the theory exhibits a mean field phase transition which is interpreted as a transition to the crystalline phase. The theory provides a qualitativ…
The specific heat Cpx has been measured for the binary system triethylamine–water as a function of temperature near the critical solution temperature at the critical concentration. Simple power law fits of the data resulted in rather large values (around 0.25) for the critical exponent α. For a fixed value of α equal…
The diffusion of $^{95}\mathrm{Nb}$ in niobium has been measured between 1353 and 2693 K. The data showed nonlinear Arrhenius behavior and fit the expression $D=[8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}\mathrm{exp}(\ensuremath{-}3.62 \mathrm{eV}/\mathrm{kT})+3.7\mathrm{exp}(\ensuremath{-}4.54 \mathrm{…
In an array of one-dimensional conductors, fluctuations in the phase of the charge-density wave lead to changes in the electron density which are coupled by long-range Coulomb interactions. The Coulomb effect has a profound influence on the dynamics of the charge-density wave as observed by inelastic-neutron scatterin…
The electronic properties of the regular graphite lattice are investigated within self-consistent LCAO (linear combination of atomic orbitals) scheme based as a modified extended-H\"uckel approximation. The band structure and interband transition energies agree favorably with previous first-principles calculations. Go…
Estimates show that both the on-site and the near-neighbor electrostatic interactions in tetracyanoquinodimethane chains may be much greater than the bandwidth. A method of determining the exact ground state when the interactions are dominant is described; the electrons are found to have a periodic arrangement which m…