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Abstract The optical and transport properties in the paramagnetic phase of α‐RuCl 3 are studied here for the first time. Values are reported for the dc conductivity of single crystals over the temperature range 110 to 500 °K in the two crystallographic directions, along and perpendicular to the optic c ‐axis: at 300 °…
The sintering and grain‐growth kinetics of finely divided MgAl 2 O 4 were determined from 1300° to 1600°C for densities up to 96% of theoretical. These results show that sintering is governed by volume diffusion and that the temperature dependence of the diffusivities is 157 exp [(‐118 kcal/mol)/ RT ] cm 2 /s. Grain g…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance study of the photoionization of thymine. Thymine cation and anion radicalsMichael D. SevillaCite this: J. Phys. Chem. 1971, 75, 5, 626–631Publication Date (Print):March 1, 1971Publication History Published online1 May 2002Published inissue 1 March 197…
The results of studies concerning the effects of artificially increasing temperature and naturally and artificially increasing day length are discussed. Naturally increasing day length was more favorable for community development than increasing clay length by artificial light. Increasing temperature is most beneficia…
Abstract Explanations of the deviations of polymer crystallisation isotherms from Avrami equations are considered in the light of the assumptions inherent in the derivation of the equations and analysis of the crystallisation isotherms; these explanations are rejected. Modified equations which allow for the presence o…
Distinct glass‐forming composition regions were found in the system Ge‐S (1) from GeS 2 to GeS 9 and (2) from GeS 1.21 a to GeS 1.5 The properties of these glasses, e.g. ir absorption spectra, thermal expansion, extraction of S 8 molecules with CS 2 , Vickers hardness, density, and optical absorption, led to the concl…
The treatment of the deterioration of insulation as a chemical rate phenomenon has been extended to cover complex multiple reactions. The relationships between the parameters goveming the thermal stability of a polymer in a given environment are calculated first for isothermal thermal endurance test conditions and sec…
The difficulties involved in the accurate measurement of the flow stress of materials at high rates of deformation are reviewed, and methods of overcoming these difficulties are discussed. It is concluded that the best experimental method is that in which a split Hopkinson bar is adapted for torsion testing, and the l…
Abstract Small‐angle multiple scattering of low‐energy heavy particles (Born parameter α > 1) in solid layers is calculated, using a scattering cross section derived from classical mechanics. The angular distribution of the scattered particles is given as a sum of two functions, which are tabulated. The calculated…
Two-electron oxidation of cobaltous octaethylporphyrin [Co(II)(Et)(8)P] yields a stable pi-cation radical [Co(III)(Et)(8)P](2+.), the optical spectrum of which exhibits spectral changes dependent upon the nature of the counterion. Comparison of these spectra with those of Compounds I of horseradish peroxidase and cata…
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Summary Examination of the clay fraction of the Gezira and Kenana soils of the Sudan revealed montmorillonite as the dominant clay mineral, accompanied by kaolinite. The presence of illite and vermiculite is questionable. Quartz was found as an accessory mineral. Most of the kaolinite is concentrated in the ‘coarse cl…