Materials Literature
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O Glatter and O Kratky 1982 London: Academic x + 515 pp price £43.60 This book is very timely since no comprehensive treatment of small angle x-ray scattering has been published since the 1955 book by Guinier and Fournet, which has been out of print for a long time. Some review papers and conference proceedings have a…
An analysis is made of the many theoretical and experimental studies of layered crystals. The results of this analysis for the particular case of group III-VI semiconductors are used to investigate the features in the electronic and phonon spectra which are due to the manifest structural anisotropy of these compounds.…
The orientational disorder of the NO 2 groups can be described either by Ising spins or by classical continuous spins. Only the latter description can explain the experimentally observed temperature dependence of the wavevector-dependent orientational susceptibility. The deficiency of the Ising spin description is two…
Abstract Nitrobenzooxadiazole-phallacidin binds specifically to the microfilamentous bundles associated with the raphe of a motile diatom, providing evidence for the actin-like nature of the filaments. Since the raphe is implicated in cell locomotion the locomotive force may be generated by the associated microfilamen…
The first experimental investigation of nucleation, growth, and coalescence in a polymer solution near the critical point is reported. A large asymmetry is observed in the kinetics of phase separation although the coexistence curve itself is only slightly asymmetric near the critical point. The observed effects are ex…
The low-energy regime (0.1-0.3 eV) of the electron-energy-loss spectrum from a clean Cu(100) surface has been measured. The experimental data show excellent agreement with predictions from a jellium calculation of the response function $g({q}_{\ensuremath{\parallel}}, \ensuremath{\omega})$. The weak inelastic signal d…
The authors present results of a neutron scattering study of the fast oxide ion conductor delta Bi 2 O 3 ; both pure and Y 3+ -doped materials are studied. The authors' results reveal extensive disorder with oxygen distributed over lattice and interstitial sites.
The band structure of Mn-based Heusler alloys of the $C{1}_{b}$ crystal structure (MgAgAs type) has been calculated with the augmented-spherical-wave method. Some of these magnetic compounds show unusual electronic properties. The majority-spin electrons are metallic, whereas the minority-spin electrons are semiconduc…
When a solution of collagen molecules, at neutral pH and moderate ionic strength, is warmed from 4 degrees to 30 degrees C, a spontaneous self-assembly process takes place in which native-type collagen fibers are produced. Events occurring during thermally induced fibrillogenesis process can be monitored, in aqueous m…
Thermoluminescence measurements of 80 K X-irradiated CaO and CaO: Li single crystals are reported. In pure CaO five glow peaks at 105, 130, 175, 205, and 275 K are associated with the thermal release of holes from different traps. All these peaks show a main emission band at 610 nm which coincides with the main band o…
A model of magnetization processes is proposed which postulates the existence of two types of domain walls (resonating and relaxating) and takes into account the distribution of grain sizes in polycrystalline ferrite specimens. Mathematical expressions for approximation of magnetic spectra are obtained. The suggested…
N 2 diffuses into the structural pores of clinoptilolite 10 3 to 10 4 times faster than does CH 4 . Thus internal surfaces are kinetically selective for N 2 adsorption. Some clino samples are more effective at N 2 /CH 4 separation than others and this property was correlated with the zeolite surface cation population.…
In order to establish the atomic order (or disorder) of Li atoms in LiFe5O8, a crystallographic structure refinement and a spectroscopic Mössbauer study are made. Several polycrystalline and monocrystalline samples are separately heat treated and studied. The results are in agreement with the existence of a short-rang…
Experimental elastic moduli of the pure vitreous inorganic oxides SiO2, GeO2, P2O5, B2O3, and As2O3, are compared with simple theoretical models of elastic deformation involving the use of available estimates for the anion-cation (first order) stretching force constants. On the basis of this comparison it is concluded…
The results of a study of the atomic structure and crystallization behavior of As-Te glasses are reported. The primary tool of this investigation is M\"ossbauer-effect spectroscopy of the Te sites. Strikingly different behavior of the spectra is observed depending on whether the As content is above or below 40 at.%. I…
We present a detailed study of the Raman spectrum of $\ensuremath{\alpha}$-LiI${\mathrm{O}}_{3}$ as a function of temperature and pressure. Measurements under hydrostatic pressure were performed at 300 and 380 K. Comparison of these results among each other and with previous results from uniaxial stress measurements p…
Deep trapping of injected holes or electrons is temporarily enhanced at room temperature in chalcogenide films which have undergone prior near-band-gap photoexcitation at room temperature. Persistence of this effect can be measured by xerographic techniques which are very sensitive to relatively small changes in trapp…
Macrocyclic Complexes of Lanthanides: Stability and Electrochemical Behaviour in Methanol and Propylene Carbonate The stabilities of the 1:1 complexes of the trivalent lanthanides with the diazapolyoxamacrocycles (2.1.) and (2.2.1.) in anhydrous methanol and propylene carbonate have been determined at 25°, by competit…
The existence of dissociation plateaus in the pressure-composition isotherms for hydrogen absorption in amorphous metals is shown to depend on the degree of configurational disorder in the host lattice. Within a mean-field approximation for the attractive elastic hydrogen-hydrogen interaction, the Stoner-type conditio…
First-principles calculations on the geometric and electronic structures of undoped and doped polypyrrole chains indicate the appearance upon high doping of bipolaron states in the gap. A picture of the band-structure evolution upon doping is presented, showing the presence of bipolaron bands in the gap for experiment…