Materials Literature
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Abstract The HeI photoelectron spectra of the N‐oxides of the azanaphthalenes 1 – 5 and of the azaanthracenes 6 , 7 were ascertained. The inferred ionisation energies, and the assignments of the spectra, are presented and are discussed in respect to the electronic structures of the N‐oxides and the spectra of the azad…
Dynamic strain aging (DSA) in solid solutions is described as diffusion of solute atoms to mobile dislocations, temporarily arrested at obstacles. As a consequence the solute concentration experienced locally by the dislocations depends on the time of arrest and the solute diffusion coefficient. Starting from this ide…
Most species of the suborder Agnostina are non-intergrading and best fit an allopatric model of speciation. Continued allopatry of some species is indicated by the existence of temporally correlative biofacies. Abrupt introduction of morphologically distinct agnostoid species into many areas suggests that migration of…
The line shapes of the exciton absorption spectra of Cu 2 O at various temperatures obtained by the wavelength modulation technique have been analysed on the basis of Toyozawa's theory. The n-th exciton lines for the yellow ( n ≥-2) and the green exciton series have asymmetric Lorentzian line shape and their half valu…
The plasma dispersion of a layered electron gas in a magnetic field is calculated in the random phase approximation for the Voigt configuration. We found that the plasmon gradually changes its character from the two-dimensional to the three-dimensional ones as the spacing between the planes of the layer decreases.
Mössbauer experiment has been performed of 57 Fe doped in antiferromagnetic NiS 2 . The supertransferred hyperfine field of 19 kOe has been observed at 4.2 K. From the analysis of the supertransferred hyperfine field, it is concluded that NiS 2 has a non-collinear spin structure. The Ni spins with ordering of the firs…
Aspects of the morphology, evolution and systematics of the Xiphosurida are treated. The ancestral forms lacked specialization for ploughing, and their chilaria were evidently developed as prosomal walking legs. The corresponding tergite (of the pregenital segment) was probably separate from the main prosomal shield i…
The d.c. conductivity of NaI has been measured in the intrinsic and extrinsic temperature regions. The formation energy E s for the Schottky defects and the energy E m + for the cation vacancy migration have been determined. The E m + value has been found to be slightly higher than that required for the motion of the…
Potential energy curves for various carrier ions in β-alumina have been calculated. All ions except the carrier ions (Li+, Na+, Ag+, K+, Rb+, Cs+) were assumed fixed in their equilibrium positions. These ionic positions were taken from Roth’s work. In our calculation the motion of carrier ions is restricted on lines o…
Using recent highly accurate pseudopotential band structures of PbSe and PbTe, the variation of the smallest gap at $L$ with hydrostatic pressure and with temperature has been calculated. The experimental values of the pressure coefficient can well be reproduced assuming reasonable slopes of the pseudopotential-form-f…
Time and wavelength resolved fluorescence techniques are used to study vibrational relation of NH and ND(A 3Π) substitutional guests in rare gas lattices. Temperature dependent localized phonon spectral structure is analyzed to show that the ground X 3Σ− state undergoes near free rotation, while the excited A 3Π state…
Aggregation process of irradiation-induced point defects in iron is examined between room temperature and 400°C with a high voltage electron microscope. In the whole temperature range examined interstitial type dislocation loops are formed. The loops formed between slightly above room temperature and 350°C have flower…
Creation of a deep localized hole in the process of x-ray photoemission from metals is followed by a drastic rearrangement of the surrounding electrons in the Fermi sea. This rearrangement in which low-energy electron-hole pairs are produced, in analogy with gas-phase atomic shake-up processes, gives rise to a low-ene…
Second-order Raman scattering has been observed in the group-${\mathrm{V}}_{b}$ semimetals Bi, Sb, and As. Comparison of the spectra in Bi and Sb, which are primarily of even ${A}_{1g}$ symmetry, with neutron-scattering measurements indicate a predominance of overtone scattering. Variations in the form of the second-o…
Phonon-dispersion curves for the hexagonal-layered compound Mo${\mathrm{S}}_{2}$ have been measured at room temperature by inelastic-neutron-scattering techniques for the [100] and [001] directions. The results have been analyzed on the basis of a model which includes valence forces between atoms in a layer and axiall…
A numerical charge integration procedure has been applied to diffraction data of TTF-TCNQ (tetrathiafulvalene-tetracyanoquinodimethane) measured at 100\ifmmode^\circ\else\textdegree\fi{}K. The results indicate an average charge transfer of (0.48-0.60) \ifmmode\pm\else\textpm\fi{} 0.15 electrons from a TTF to a TCNQ mo…
The thermoluminescence response to gamma rays of the most sensitive glow peaks in LiF (II to V) reaches a maximum and then decreases. The decrease in response is attributed to radiation damage. It is observed that even after the considerable reduction in the TL, which results from a heavy dose, the saturation exposure…
The electrical properties of La 1-x Sr x VO 3 change from those of a semiconductor to those of a metal as x is increased, with a metal-nonmetal transition occurring at x approximately=0.2. This has been studied using AC and DC conductivity and thermopower measurements over a temperature range from 4 to 400K. Evidence…
Coexisting metallic and semiconducting phases have been obtained by passing DC currents through VO 2 single crystals. The mixed state was studied by optical microscopy. Narrow semiconducting strips that nucleate at the positive edge of a metallic domain and propagate towards its negative edge have been observed under…
A ${T}^{2}$ behavior for the conductivity across the layers is observed in $4Hb$-Ta${\mathrm{S}}_{2}$ crystals below 35 K. This indicates that tunneling occurs between metallic layers separated by an insulating layer. Evidence for thermally activated hopping is observed at higher temperatures.