Materials Literature
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The electrical, optical, and magnetic properties of layered compounds of dichalcogenides of transition metals and intercalated crystals are considered. Particular attention is paid to the anisotropy of these properties and to the analysis of the changes produced by intercalation. Experimental data are presented on the…
A model for anomalous diffusion in the bcc phase of group-$\mathrm{IV}B$ transition metals is proposed, based on the identity of structure of the activated complex for diffusion and the basal plane of the low-temperature metastable $\ensuremath{\omega}$ phase. An expression for the diffusion coefficient is derived fro…
The growth of W grains in sputtered W-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ films as a consequence of annealing results in a narrowing of the transition region from metallic to nonmetallic conductivity. The conductivity, $\ensuremath{\sigma}$, as a function of the volume fraction of the metal, $x$, exhibits a critical…
Abstract Die Titelkomplexe (I) wurden durch Reaktion des Liganden mit den Lanthanoidperchloraten dargestellt und durch Leitfähigkeits‐ und IR‐Untersuchungen ch siert.
The paper is concerned with the development of a satisfactory basis for assessing design stresses. An attempt is made to trace the prime factors involved and details are given of corrosion fatigue tests at various mean stresses on propeller alloys in the form of heavy castings. A new philosophy of design stressing has…
Electron spin resonance has been studied in V 1-x Cr x O 2 compounds in the range fo compositions (0.3%<x<3%). The behaviour of the Cr 3+ resonance in the three insulating phases M 1 , T and M 2 has been examined. Strong modifications of this resonance occur at the M 1 -T phase transition, for which an interpretation…
The dielectric constant (K′) and loss (K″) of single crystals of NaCl, KCl, and KBr have been measured in the frequency region 104 to 107 Hz and in the temperature range 25 to 8 °C below their melting temperatures. The electrical conductivity of these crystals has also been measured at 104 Hz near their melting temper…
Direct experimental evidence is presented concerning the transformation of SnTe. This transformation is proved to be cubic to orthorhombic. The transformation temperature is found to depend on the stoichiometry of this compound, in a way similar to that observed in the isomorphous GeTe, i.e. the transformation tempera…
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…