Materials Literature
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Vacuum ultraviolet absorption in alkali-nitrites (NaNO 2 and KNO 2 ) and alkali-nitrates (LiNO 3 , NaNO 3 , KNO 3 , RbNO 3 and CsNO 3 ) has been investigated in the region from 5 to 23 eV at room and liquid nitrogen temperatures. Two types of absorption bands are observed for each of these salts with polyatomic anions…
K2MoO4, K2WO4, Rb2MoO4, and Rb2WO4 are monoclinic and isomorphous: Cs2MoO4 and Cs2WO4 are isomorphous with orthorhombic b-K2SO4. Cell consts. and at. parameters are calcd. from powder data, and the powder patterns are given. [on SciFinder (R)]
The evaluation of the elastic scattering differential cross section of electron scattering from a planar surface of a vibrating lattice is reduced to the solution of a set of coupled algebraic equations for the associated scattering amplitude. This reduction is valid both for overlapping potentials (thus removing the…
Single crystal samples of tellurium obtained from small diameter ingots, specially grown by the Czochralski method from a melt of the purified element, were studied by measuring the electrical conductivity (σ), Hall coefficient (R H ), and transverse magnetoresistance (Δρ/ρ 0 ). As a result of annealing and etching, t…
Three different types of radiationless transitions play a role in the radiationless decay of the luminescent Eu3+ center in LaAlO3: (a) a temperature-independent process from the charge-transfer state, (b) a temperature-dependent process (ΔE = 0.15 eV) from this state, (c) a temperature-dependent process (ΔE = 1.1 eV)…
Electrical properties of hydrides and deuterides of zirconium have been investigated between 1.1 and 410\ifmmode^\circ\else\textdegree\fi{}K. The metallic nature of these materials is evident in the fact that for compositions approaching Zr${\mathrm{H}}_{2}$, the hydride is a better conductor than is high-purity zirco…
This paper reports the study of the photogeneration and charge transport of holes in evaporated samples of vitreous ${\mathrm{As}}_{2}$${\mathrm{Se}}_{3}$. The photogeneration is characterized by a field-dependent quantum efficiency which is similar to that found in vitreous Se. The charge transport is described by as…
A solution to the linearized Boltzmann equation has been found that describes the galvanomagnetic properties of metals. The use of a vector mean-free-path function results in a solution for the conductivity tensor that is valid for any strength and orientation of the applied magnetic field. A discussion is given of th…
Summary The mineralogy of the processes leading to the formation of soils by the tropical weathering and leaching of rocks is reviewed, and illustrated by the results of an investigation into the formation, mineralogy and plasticity properties of some soils formed on basalt, granite, shale and sandstone in west Malays…
The 1000-Hz 300\ifmmode^\circ\else\textdegree\fi{}K dielectric constants of some alkali halides were measured to an accuracy of 0.01% by the method of substitution. Reproducibly different values for various crystals of the same type were obtained which varied beyond the experimental error. The ranges of results for va…
It is shown theoretically that the orientation pattern of cholesteric liquid crystals can be less stable in electric and magnetic fields than was previously thought. Specifically, the planar texture between two conducting glass plates may become unstable at voltages much below those needed to unwind the cholesteric he…
We present some measurements on the instability threshold of $p\ensuremath{-}\mathrm{m}\mathrm{e}\mathrm{t}\mathrm{h}\mathrm{o}\mathrm{x}\mathrm{y}\ensuremath{-}n$, $p\ensuremath{-}\mathrm{b}\mathrm{e}\mathrm{n}\mathrm{z}\mathrm{i}\mathrm{l}\mathrm{i}\mathrm{d}\mathrm{e}\mathrm{n}\mathrm{e}$ butylaniline (MBBA) under…
The nature of the emission from central metal ions in complexes can be controlled by chemical alteration of the ligands. For iridium(III) species three types of emission have been observed, each originating from a different and orbitally identifiable excited state. Principles useful for designing new luminescent mater…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of three-dimensional structure in proteins. I. Rapid nonenzymic reactivation of reduced lysozymeDonald B. Wetlaufer and V. P. SaxenaCite this: Biochemistry 1970, 9, 25, 5015–5023Publication Date (Print):December 8, 1970Publication History Published online1 May 2002…
(ReivedJune181970
The Molten Salt Reactor Experiment has been refueled with an enriching salt concentrate, 7LiFUF4 (73 to 27 mole%). Sixty-three kilograms of this was prepared in a shielded cell in the Thorium-Uranium Recycle Facility at Oak Ridge National Laboratory. The preparation process involved reducing 233UO3 to UO2 by treatment…
This paper describes the mineral cerotungstite found as a secondary crystallization in some tungsten deposits in northern Rwanda and in the Kigezi District of south-western Uganda. Cerotungstite represents a cerian analogue to yttrotungstite known from the Kramat Pulai tin deposit in Malaysia. Therefore, some new data…
Dislocation structures of (001) sections of natural crystals of barite have been studied by x-ray diffraction topography. Pure edge dislocations along [100] with Burgers vector b = b [010], and pure screw dislocations with Burgers vector b = (a + b) [l10] were found. Mixed dislocations which were either predominantly…
At 4 and 77 K, photoluminescence from nominally undoped and 0.0025% Cr-doped CaTi${\mathrm{O}}_{3}$ shows identical spectra in the infrared with an intensity ratio of 1:2. The emission is attributed to the $^{2}E\ensuremath{\rightarrow}^{4}A_{2}$ transition of the ${\mathrm{Cr}}^{3+}$ ion at a ${\mathrm{Ti}}^{4+}$ sit…
1. Retinol and stilbene are both isomerized when they are illuminated anaerobically in the presence of flavins. 2. Triplet quenchers (e.g. oxygen, potassium iodide and paramagnetic ions) inhibit the reaction more efficiently than they quench flavin fluorescence. At 77 degrees C in a diethyl ether-isopentane-ethanol (5…