ChemInform Abstract: THE CRYSTAL STRUCTURE OF PRUSSIAN BLUE‐ FE4(FE(CN)6)3.XH2O
Abstract Einkristalle der Titelverbindung mit x=14‐16 werden erhalten durch langsame Wasserdampfdiffusion in Lösungen von Fe3+ und Fe(CN)64‐ in konz. HCl.
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On lamellar organization in certain polyethylene spherulites
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…
Die rolle der polyenoxidation beim thermooxidativen PVC‐abbau
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…
Study of the Tricritical Point in KH2PO4byγ-Ray and Neutron Diffractometry
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…
Long-range potential centres in disordered solids
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…
Magnetic phase transitions of CeSb. I. Zero applied magnetic field
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…
Electrical Properties of the Organic Metallic Compound bis (tetrathiotetracene)‐triiodide, (TTT)2‐I3
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…
Mechanism of superplastic deformation in a magnesium alloy. III. The deformation model
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 disposal of nuclear waste in space
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…
Kinetic properties of 〈111〉 tilt boundaries in aluminium
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…
Observation of the Band-Hopping Transition for Electrons in Naphthalene
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…
The electronic structure of trigonal Se and Te for pressure near the phase transition points
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…
On the crystallization of macroionic solutions
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…
Heat capacity of the binary liquid system triethylamine–water near the critical solution point
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…
Niobium self-diffusion
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{…
Dynamics of the charge-density wave. II. Long-range Coulomb effects in an array of chains
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…
Self-consistent LCAO calculation of the electronic properties of graphite. I. The regular graphite lattice
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…
Generalized Wigner lattices in one dimension and some applications to tetracyanoquinodimethane (TCNQ) salts
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…
Dynamics of the charge-density wave. I. Impurity pinning in a single chain
We study the effect of impurities on the dynamics of charge-density waves. At low temperature it is a good approximation to restrict our attention to phase fluctuation only. The competition between the random impurity potential and the elastic energy for phase fluctuations leads us naturally to consider two limiting c…
A versatile atomic number correction for electron-probe microanalysis
A new atomic number correction is proposed for quantitative electron-probe microanalysis. Analytical expressions for the stopping power S and back-scatter R factors are derived which take into account atomic number of the target, incident electron energy and overvoltage; the latter expression is established using Mont…