Materials Literature
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Abstract X‐ray diffraction patterns of a number of commercial bleaching earths indicate that they consist mainly of montmorillonite mixed with smaller amount of kaolinites as well as mica, quartz and cristobalite. The active sites in these earths for the adsorption of β‐carotene are identified through ion exchange and…
The ultrasonic dispersion in the incommensurate (antiferroelectric) phase of NaNO 2 has been examined by a Brillouin scattering experiment with a special emphasis on the temperature regulation near its phase transition temperatures. A slight anomaly of the frequency shift ( Δ ν) of the longitudinal mode was observed o…
Abstract Polyamideimides were prepared either directly from N‐(p ‐carboxyphenyl)trimellitimide and p , p ′‐di(aminocyclohexy)methane (PACM‐20) by low temperature (<5°C) polycondensation in presence of thionyl chloride or by reacting the diacid chloride of N ‐( p ‐carboxyphenyl)trimellitimide and PACM‐20 at 30–70°C.…
Abstract Pd–TPPS3 was found to be an effective photosensitizer for the photoreduction of viologen dyes, such as methyl, ethyl, propyl, butyl, and heptyl viologens. The order of the reduction rate was as follows: Ethyl&gt;Butyl&gt;Methyl&gt;Propyl&gt;Heptyl. The respective complex formation was observed…
Abstract The iron oxides and clay mineralogy were characterized for several soils of Venezuela which contain plinthite and pseudo‐plinthite. Molar ratios of SiO 2 /Al 2 O 3 (Ki ratios) of the plinthite and pseudo‐plinthite zones range from below 2 to above 4 suggesting a wide range in mineral composition. Cation excha…
Reports the results of magnetic measurements performed on Gd(Fe y Al 1-y ) 3 and (Gd x Y 1-x )Fe 3 compounds over the temperature range 4.2-1300K. For x and y>or=0.2 the compounds are ferrimagnetically ordered. In this case, the reciprocal susceptibility chi -1 follows a Neel-type hyperbolic law. The YFe 3 compound is…
Recent data have been used to develop the strongly discommensurate model for NbSe 3 that was introduced in 1978/9. The tightly defined q vectors found for both CDWS are accounted for by a plausible internal structure for the discommensurations. These, because of their relatively weak impurity pinning, seem to form a v…
The configurational entropy as well as other related thermodynamic properties of a (poly)disperse glass-forming polymer melt have been calculated exactly in terms of a lattice-hole model and within the framework of the mean field approximation (MFA). One of the main results of the calculation, in which the average “st…
A three dimensional model is developed to describe the linear-sublinear behaviour of the thermoluminescence (TL) dose response curve induced by heavy charged particles specifically 'low energy' ( approximately 1 MeV u -1 ) alpha particles. Supralinearity induced by alpha particles is shown to be suppressed or non-exis…
The ground-state energies in magnetic fields are calculated for the electron crystals with the bcc and fcc structures at low electronic densities. The energies are obtained as sums of the static energy and the zero-point vibration energy in the harmonic approximation. The zero-point energy of the fcc becomes lower tha…
The rotational viscosity ${\ensuremath{\gamma}}_{1}(T)$ of a nematic is of dominant importance for wide operating temperature display applications. In this paper we show that ${\ensuremath{\gamma}}_{1}(T)$ is, except for a small prefactor variation, a universal function of $T\ensuremath{-}{T}_{g}$ where ${T}_{g}$ is t…
Deuteron NQR spectra of several model systems involving alcoholic of phenolic-OD groups are discussed. The spectra of alpha hydroquinone and its two isomers resorcinol and catechol show complex structure due to the presence of inequivalent O–D⋅⋅⋅O hydrogen bonds. In the case of hydroquinone, this structure collapses t…
The microstructure of two commercial 2:17 precipitation hardened rare-earth magnets has been examined and compared with the magnetic properties. Transmission electron microscope studies on Sm(Co,Fe,Cu,Hf)7.25, Hicorex 99C show a fine cellular microstructure with 2:17 rhombohedral cells surrounded by coherent 1:5 hexag…
The infrared spectra of Ni1−xCuxFe2O4 (x=0, 0.1, 0.2) studied at room temperature in the range of 250–800 cm−1 show two main bands. On adding copper to nickel ferrite, the center frequency of these two bands is found to shift to lower energies. The force constants obtained using the center frequency have been observed…
Effects of Si addition into amorphous (Fe0.064Co0.936)76.5 -B23.5 alloy having zero magnetostriction were investigated by the measurement of high-field magnetization at room temperature in the field range 150≤H≤13 000 Oe. The FeCo-B alloy shows anomalies in both the law of approach to saturation and the para process.…
Abstract The sol content of previously extracted samples of lightly crosslinked silicone rubber has been found to increase during prolonged storage under relatively mild conditions. Simultaneously, the tensile stress slowly decreases in samples held stretched, and the equilibrium degree of swelling increases somewhat.…
A lattice model with full rotational invariance is proposed for describing nematic liquid crystals. Orientational long-range order at low temperature is proved using the infrared bound method.
An apparatus is described which is used to measure the magnetic field vectors in electrical steel sheets in rotating magnetic fields. To avoid complicated eddy current effects we produce a rotating B-vector with constant modulus and angular velocity. Considerable variations of the modulus of the magnetic field strengt…
The applications of ferromagnetic amorphous alloys provide an excellent example of the unpredictable nature of the benefits from research and from the development of a technology. This paper traces a brief history of applications of amorphous alloys as soft magnetic materials. Specific applications are then discussed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational spectra and analyses of the S42+, Se42+, Te42+, and trans-Te2Se22+ polyatomic cationsRobert C. Burns and Ronald J. GillespieCite this: Inorg. Chem. 1982, 21, 11, 3877–3886Publication Date (Print):November 1, 1982Publication History Published online1 May 2002Publi…