Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPOLYPEPTIDES. Xa. ADDITIONAL COMMENTS OF THE AMINE-INITIATED POLYMERIZATIONPaul Doty and R. D. LundbergCite this: J. Am. Chem. Soc. 1957, 79, 9, 2338–2339Publication Date (Print):May 1, 1957Publication History Published online1 May 2002Published inissue 1 May 1957https://pub…
Tetragonal BaTiO3 is transformed into cubic BaTiO3 as a result of irradiation with fast neutrons at a temperature of approximately 100°C. Sufficient atomic displacements are produced by bombardment with an integrated fast neutron flux of 1.8×1020 n/cm2 so that tetragonal single crystals (c0=4.0349 A and a0=3.9923 A) e…
The paramagnetic resonance spectrum in crystals of GdCl 3 diluted with LaCl 3 and CeCl 3 has been examined. The splitting of the ground level 8 S 7,2 of Gd 3+ in zero magnetic field is small, and has a remarkable temperature dependence. A theory to account for the experimental results is developed, and it is shown tha…
Measurements have been made of the energy distribution of electrons penetrating thin samples of Al2O3. The observations were made using a 127° electrostatic analyzer. These results allow a determination of the dissipation of electron energy with depth when 2.5–10 kev electrons strike Al2O3. Results obtained indicate t…
A procedure for the spectrochemical analysis of lead samples, such as corrosion products of lead sheath is described. The powdered material is buffered with germanium dioxide and graphite powder and the resultant mixture pelletized. Multisource type discharges are used. Desired elements can be measured over a wide ran…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of 2,1,3-Benzoselenadiazole and Its Derivatives. I. Ultraviolet-Visible Absorption Spectra1EUGENE SAWICKI and ALBERT CARRCite this: J. Org. Chem. 1957, 22, 5, 503–506Publication Date (Print):May 1, 1957Publication History Published online1 May 2002Published inissue…
A mass spectrometric analysis of vapors effusing from a Knudsen cell containing either solid ZrO2 or a mixture of Zr and ZrO2 powders has been employed to determine the vapor pressures, and hence the heats of sublimation of these species. Combined with published thermodynamic data, these results yield 7.8±0.2 ev and 1…
Uniform thin films of carbon in the thickness range 100 to 2300 A have been prepared by arc-evaporation in vacuum. Evaporation rates were about 50 A/sec. The electrical properties of these films suggest that unannealed arc-evaporated carbon had less long-range order and was, therefore, more truly amorphous in structur…
The structure of quartz and vitreous silica disordered by heavy irradiation (10 20 neutrons per cm. 2 ) of fast neutrons was studied by means of X‐ray diffraction and infrared spectroscopy. The results indicate that the structure of the disordered amorphous form of silica resembles closely that of vitreous silica. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbonization of Anthracene and Graphitization of Anthracene CarbonsC. R. Kinney, R. C. Nunn, and P. L. WalkerCite this: Ind. Eng. Chem. 1957, 49, 5, 880–884Publication Date (Print):May 1, 1957Publication History Published online1 May 2002Published inissue 1 May 1957https://…
Measurements are reported of the electrical and thermal resistivity between 2\ifmmode^\circ\else\textdegree\fi{}K and room temperature of high-purity tellurium rods prepared by zone refining. The maximum thermal conductivity in the case of a single crystal of 3-mm diameter is about 10 watts/cm deg at 4\ifmmode^\circ\e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrecipitation of Calcite and AragoniteJohn L. Wray and Farrington DanielsCite this: J. Am. Chem. Soc. 1957, 79, 9, 2031–2034Publication Date (Print):May 1, 1957Publication History Published online1 May 2002Published inissue 1 May 1957https://pubs.acs.org/doi/10.1021/ja01566a…
Stacking faults on the (111) planes of several face-centred cubic metals and alloys have been introduced by cold work, and estimates of the stacking fault probability α, have been obtained from changes produced in the Debye-Scherrer spectrum. The faulting probability increases on alloying, from one plane in 300 in cop…
A neutron diffraction study has been made of the magnetic properties of the series of perovskite-like compounds $\mathrm{La}[(1\ensuremath{-}x)\mathrm{Mn}, x\mathrm{Cr}]{\mathrm{O}}_{3}$. This series exhibits ferromagnetic and antiferromagnetic properties which depend on the composition of the sample. The antiferromag…
Atomic scattering factors can be expressed analytically by an expansion of Gaussian functions. A two-term expansion is sufficiently accurate to cover the Cu Ks range of scattering angles occurring in crystallographic calculations. For the Mo Ks range, one extra constant is to be added.
Several seandates, vanadites, galliates and orthoehromites of several of the rare earth elements and yttrium are isostructural with Gd_FeO 3. The paper includes a summary discussion of the compounds so far studied in this series of papers. Particular emphasis is given the transitions which have b~en observed and the r…
Abstract Zinc crystal wires in which the basal plane was nearly parallel to the wire axis were found to twin at abnormally high stresses. No single critical resolved shear stress exists; resolved shear stresses near 3⋅7 Kg/mm2 were common for short crystals, while longer crystals (which often fractured at the instant…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal Reactions between Calcium Hydroxide and Amorphous Silica: the Reactions between 180 and 220°Gunnar O. AssarssonCite this: J. Phys. Chem. 1957, 61, 4, 473–479Publication Date (Print):April 1, 1957Publication History Published online1 May 2002Published inissue 1 A…
In this paper the various causes which determine yarn hairiness are studied with particular reference to the influence of twist. A theory of the causes of hairiness in cotton, worsted and spun rayon yarns, which is based on the work of Morton and Yen concerning the migration of fibres in yarns, is outlined. The hairin…
The magnetostriction of oriented polycrystalline MnBi was found to be higher than any published value for a metal. A value of −250×10−6 was measured parallel to a field of 22 000 oersteds oriented perpendicular to the c axis of the aligned hexagonal crystallites. This field magnetized the specimen to only slightly mor…