Materials Literature
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A differential parallel-plate capacitance dilatometer has been used to measure the linear thermal-expansion coefficients of free-standing samples of solid argon (1-35 K), krypton (1-45 K), and xenon (1-105 K). The present data for argon and krypton are systematically larger than existing x-ray lattice-parameter data a…
Transport properties of sputtered VO2 films are shown to be critically dependent on the defect structure of this material. Measured values of thermoelectric power and Hall mobility for films deposited under optimum conditions are comparable to those previously measured on single crystals.
Electroabsorption was measured on selenium single crystals as a function of temperature, polarization of light, and direction of the modulating electric field. Interpretation along the lines of Elliot's theory of indirect excitonic transitions yields the assignment of the conduction-band minimum to the point $Z=(0, 0,…
The results of augmented-plane-wave (APW) energy-band calculations for the $3d$ transition-series monoxides CaO, TiO, VO, MnO, FeO, CoO, and NiO are interpreted in terms of the electrical and optical data for these compounds. A detailed analysis of the effects of a crystalline field on the nonmagnetic $d$ bands in the…
The crystal structure of Gdz(MoO4)a has been investigated both at room temperature and at elevated temperatures below and above the ferroelectric-ferroelastic transition temperature (~ 160°C). Space group, unit-cell dimensions, and formula units per unit cell Pba2 (C8v), a= 103881 +00003, b= 104194+0.0004, c= 107007+0…
In this paper we report measurements of the effects of large static uniaxial stress along [001], [111], and [110] on the frequency of the $\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}\ensuremath{\approx}0$ optical phonons in Ge, GaAs, GaSb, InAs, and ZnSe using first-order Raman scattering. In the absence of stress…
Based on empirical evidence, it is suggested that the energy band structure in PbPo may be inverted from that in PbS, PbSe, and PbTe. This inversion would result in PbPo having an ${{L}_{6}}^{+}$ conduction-band edge and an ${{L}_{6}}^{\ensuremath{-}}$ valence-band edge, implying a negative value of the energy gap ${E…
We have observed a new conduction mechanism in granular metals at low temperatures and high electric fields $\mathcal{E}$ characterized by a field-dependent conductivity ${\ensuremath{\sigma}}_{0}\mathrm{exp}(\frac{\ensuremath{-}{\mathcal{E}}_{0}}{\mathcal{E}})$. A theory based on a simple model of field-induced elect…
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In the preparation of impregnated catalyst composed of alumina carrier and cobalt salt the mixture of alumina or alumina hydrate and cobalt salt is calcined at the temperature between 500°and 800°C. From the theoretical and practical viewpoints it is important to clarify the state of cobalt compounds in the prepared c…
The average magnetic susceptibility and magnetic anisotropy of cerous magnesium nitrate over the temperature range 80–300 K are reported. These results, together with the previously reported g-values, have been interpreted in terms of a point-charge crystal-field model with the inclusion of an orbital reduction parame…
The temperature and magnetic field dependence of the thermal expansion and forced magnetostriction of one cold worked and three annealed Fe–Ni–Co alloy samples has been measured at low temperatures. Sample A (Fe‐34% Ni‐8% Co annealed) and sample D (Fe‐39% Ni‐10% Co cold worked) had large forced magnetostrictions and l…
Extended dislocation nodes in αCu-Al solid solution were observed by a transmission electron microscope, and stacking fault energies (SFE) were determined. The specimens were annealed at 700°C after deformation to eliminate the effect of the solute impedance force pinning partial dislocation. Firstly, the variation in…
cis-5,6-Dideuterio-cis-cyclo-octene has been synthesised in one step from cyclo-octa-1,5-diene by reduction with dideuteriodi-imide. On prolonged pyrolysis at 250°, intramolecular transfer of the vicinal 5- and 6-protons to the double bond does not occur; thus no 1,2-dideuterio-cis-cyclo-octene is formed.
Intergranular embrittlement induced by equilibrium segregation of solutes is now recognized in a number of engineering alloys, particularly in ferrous systems. In such multicomponent systems, grain-boundary segregation effects can be quite complex, with competitive interactions among a number of surface-active species…
Electrodeposition of metallic coatings for decorative purposes is such an extensive topic that it is intended to review in detail only the most important metals. Some indication of types of plating solutions and general formulations is given, but voluminous patent literature exists on this subject. The physical and me…
Platinum group metal catalysts are incorporated in the Cataheat flameless combustion systems designed by Matthey Bishop to burn hydrocarbon fuels. These systems are safer and more efficient than radiant heaters with an open flame. They are used in portable heaters for a wide range of agricultural, industrial and recre…
This paper deals with an examination of the hypothesis for striation thickness by Mohr. The effect of viscosity ratio on striation thickness is examined in a cone rotor-type mixer as a uniform shear system, and it is concluded that the effect of the viscosity ratio might be negligible in a system where a minor compone…
Abstract After n‐irradiation of CaWO 4 up to a dose of 3 × 10 19 nvt a spectrum consisting of 12 narrow lines is observed. The angular variation of the spectrum shows that a centre with S = 3/2 located at four magnetically inequivalent sites in the structure is involved. The data are consistent with a spin Hamiltonian…
As a part of a major AGARD project concerning thermophysical properties of solid materials at high temperatures, cooperative thermal expansion measurements up to 1000°C were carried out using pushrod techniques. Sixteen laboratories have contributed results. Parallel samples having the same history were used for all t…