Materials Literature
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The spectra between 4000 and 23 000 cm−1 of gaseous UCl4 have been obtained for the temperature range 950° to 1250°K. These spectra have been compared with those of single-crystal UCl4 at 77°K and room temperature. Spectra of solid UCl4 were obtained over the temperature range 300° to 827°K in order to compare with th…
The electrical resistivity and the magnetoresistance in $n$-type InSb containing more than 1.8\ifmmode\times\else\texttimes\fi{}${10}^{14}$ ${\mathrm{cm}}^{\ensuremath{-}3}$ carriers have been measured from 4.2 to 0.1\ifmmode^\circ\else\textdegree\fi{}K. The resistivity increases logarithmically as the temperature is…
The exciton structure in hexagonal ZnS has been studied in transmission and interpreted in terms of an effective-mass formalism. The ${n}_{1}=1,2,3,4,\mathrm{and}5$ states of the first (${\ensuremath{\Gamma}}_{7}\ensuremath{-}{\ensuremath{\Gamma}}_{9}$) series, and the ${n}_{2}=1,2,\mathrm{and}3$ states of the second…
The band-to-band optical absorption is calculated for a direct-band-gap semiconductor that has one band degenerate $n$ or $p$ type. The degenerate band is treated as a high-density Fermi gas. It is shown that exciton states, arising from the electron-hole Coulomb attraction, still affect the optical absorption. The ca…
The valence and conduction bands of potassium chloride were determined by the augmented-plane-wave method from a potential of a more general functional form than that usually assumed in this method. With a few iterations of the band calculation within the Hartree-Fock-Slater (HFS) approximation, a good degree of self-…
Abstract p ‐Isocyanatobenzenesulfonyl chloride (I) and m ‐isocyanatobenzenesulfonyl chloride (II) were prepared by treating the corresponding aminobenzenesulfonic acids with phosgene and phosphorous pentachloride in dioxane. Tha compounds I and II were subjected to polycondensation‐addition with several diamines to ob…
Biotite alteration under acid conditions proceeds differently from the generally accepted pathway of transformation to vermiculite in which hydrated cations cause interlayer expansion, resulting in a dark-colored peripheral band on mica particles. Acid solutions of synthetic or biologic origin remove octahedral ions,…
The single-ion contribution to magnetostriction in the transition metal monoxides NiO, MnO, FeO, and CoO is calculated on a very simple model and found to account for substantially all the observed magnetostriction. Exchange is included in a molecular-field approximation, and the single-ion magnetoelastic parameters $…
The transfer of energy from single chromium ions to closely coupled pairs of chromium ions in ruby has been investigated. Ruby samples whose concentrations ranged from 0.003 to 1.0% ${\mathrm{Cr}}_{2}$${\mathrm{O}}_{3}$ were prepared and in each crystal the intensity of single-ion fluorescence and of pair fluorescence…
The single-electron capture and loss cross sections ${\ensuremath{\sigma}}_{0,\ensuremath{-}1}$ and ${\ensuremath{\sigma}}_{01}$ for 2-50-keV hydrogen atoms incident upon hydrogen molecules and inert-gas atoms have been measured directly by observing the growth of the fast-collision products (i.e., the fast primary $\…
The significance of present knowledge of the structure of the protein collagen to the study of isinglass and the finings derived from it is examined. It is suggested that differences in fining efficiency of solutions prepared by identical processes from different sources of isinglass are due to variations in the size…
As a method to desilicify from black liquor containing silica in rich amount, carbon dioxide process was investigated. Particularly, the relation between the final pH of the black liquor and the removal percentage of silica by the carbon dioxide treatment was clarified. Further, based on the obtained knowledge of the…
The phenomenological effects of calcination as expressed by such properties as shrinkage, specific gravity, bulk density and porosity were investigated on magnesites from different sources in India, over temperatures ranging from 600°C to 2000°C. No single property is adequate to assess properly the quality of a magne…
B. M. Gatehouse and P. Leverett, Chem. Commun. (London), 1967, 374 DOI: 10.1039/C19670000374
The changes of hardness, Cahrpy impact value, lattice parameter of ferrite, internal stress in matrix, carbide reaction, elements in carbide, and electron microstructure occuring during isothermal tempering of hot-work tool steels of 3Cr-5W-0.3V(DSS), 3Cr-9W-0.3V/(DSH), 3Cr-5W-0.3V-3Co(CoSS), 3Cr-9W-0.3V -3Co(CoSH), 1…
The chemistry of non-peroxo polynuclear cobalt(III) ammines is reviewed with particular emphasis on Werner's major contributions. Modern work in this area has shown that Werner's conclusions regarding the structures of these compounds are substantially correct in spite of the relatively primitive techniques he had ava…
Abstract Results are presented of the structures obtained upon crystallization of polypropylene from dilute solutions in α ‐chloronaphthalene. It is shown that under proper conditions of concentration and crystallization, isotactic polypropylene can be caused to grow in the form of lath‐shaped single‐crystal lamellae.…
Abstract Es gelang, unter den Bedingungen des Abkühlungsverfahrens aus Schmelzlösungen von MgO in Natrium‐ bzw. in Bleimetaborat, Kristalle von Kotoit, Mg 3 [BO 3 ] 2 , zu erhalten. Die optimalen Versuchsbedingungen werden angegeben. Aus Schmelzlösungen von MgO in Calciummetaborat kristallisiert eine nicht identifizie…
酢酸マグネシウム4水和物の分解反応の示差熱分析図形は,試料充てん層の厚さにより著しい変動を示す。この事実から,示差熱分析を中心として,熱天秤,X線回折,化学分析などの方法により,空気中における酢酸マグネシウム4水和物の熱分解の過程を追跡した。4分子の結晶水の脱水は約60℃ から開始するが,脱水の過程に中間水和物の生成はなく,一段脱水である。160℃以下の温度で脱水した無水物は,X線的に無定形状態であるが,180～220℃の温度範囲で結晶化が起こり,α型無水物となる。無水物は180～280℃ の温度範囲で数%分解するが,大部分は280℃ まで熱的に安定である。無水物は約300℃ で酸化マグネシウムに分解するが,熱分解の過程に中間化合…
The weight volume of wood, WRV of pulp and certain physical properties of paper of some tropical and Japanese hardwoods were studied from the morphological point of view.Correlation between the ratio of lumen diameter and fiber diameter (l/D) was found to have close relationship to such properties as the weight volume…