Materials Literature
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A study was made of the factors controlling the distribution of magnesium in the calcareous skeletons of marine organisms. The mineralogy of the carbonate appears to be the most important influence, with large amounts of magnesium occurring in solid solution in the calcitic forms and generally lesser amounts in the ar…
In this investigation, the relation of susceptibility to the $a$ dimension of crystallites was studied over the range from turbostratic carbons with diameters of 50 angstroms, to graphitic crystals with diameters of at least several thousand angstroms. Two series of carbons, one Thermax carbon black in powder form, th…
The resistivity and Hall coefficient of pure, single-crystals tellurium and of six single-crystal tellurium-selenium alloys, ranging from 2.7 percent to 13.2 percent selenium by weight, were measured over the temperature range 90\ifmmode^\circ\else\textdegree\fi{}K to 550\ifmmode^\circ\else\textdegree\fi{}K, and a few…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStandard X-Ray Diffraction Powder Patterns.Ludo K. FrevelCite this: J. Am. Chem. Soc. 1954, 76, 7, 2031Publication Date (Print):April 1, 1954Publication History Published online1 May 2002Published inissue 1 April 1954https://pubs.acs.org/doi/10.1021/ja01636a108https://doi.or…
THAT certain ancient silver articles, including coins, have in the course of time become exceedingly brittle is fairly well known. Silver coins which have been struck must have been ductile at the time of manufacture and hence have become brittle as a result of some sort of ageing process. This form of embrittlement h…
Hideo Yamatera, Kazumi Nakatsu; The Crystal Structure of Cs3Fe2Cl9 and of Cs3Sb2Cl9, Bulletin of the Chemical Society of Japan, Volume 27, Issue 4, 1 April
The air-drag of textile threads of different materials (e.g., nylon, rayon, wool, and especially cotton) has been measured over a range of air speeds from 20—600 ft/sec and over a range of counts. The results, the conclusions drawn from them, and descriptions of the experimental techniques used, are given in this pape…
Abstract The degree of polymerization of a polyamide is determined by the equilibrium between carboxyl, amino, and amide groups, and water molecules. Equations are deduced for the relationship between the equilibrium constant k 1 , the number‐average chain length n and the partial pressure of water. Allowance is made…
The appearance, growth, and structure of a cotton fiber are described, and photomicrographs and electron micrographs are used to illustrate both gross and fine features of the cell wall morphology. Heretofore, microscopy of the fiber has been limited to the use of dispersion, swelling and staining methods, in plain an…
Abstract The interaction between cellulose and heavy water allows absorptions due to stretching of OH groups in crystalline and amorphous regions to be studied independently. Crystalline regions give several absorption bands in the 3600–3000 cm. −1 range and it is shown that all the bands are due to stretching of OH g…
The proton magnetic resonance absorption has been measured in NH4Cl, NH4Br, and NH4I crystal powders from —195°C to room temperature, and for NH4Cl to 200°C. Line width transitions were found at —144, —171, and about —198°C in the chloride, bromide, and iodide, respectively. The N–H distance in the ammonium ion was de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAbsorption Spectra and Electrical Conductivities of UO2-ThO2 Solid Solutions1Dieter M. GruenCite this: J. Am. Chem. Soc. 1954, 76, 8, 2117–2120Publication Date (Print):April 1, 1954Publication History Published online1 May 2002Published inissue 1 April 1954https://pubs.acs.o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Decomposition of Hypobromite and Bromite SolutionsP. Engel, A. Oplatka, and B. Perlmutter-HaymanCite this: J. Am. Chem. Soc. 1954, 76, 7, 2010–2015Publication Date (Print):April 1, 1954Publication History Published online1 May 2002Published inissue 1 April 1954https://pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Polymerization of Monosilicic AcidG. B. AlexanderCite this: J. Am. Chem. Soc. 1954, 76, 8, 2094–2096Publication Date (Print):April 1, 1954Publication History Published online1 May 2002Published inissue 1 April 1954https://doi.org/10.1021/ja01637a017RIGHTS & PERMISSIONSAr…
Experimental determinations of the ionic conductivity of impure or "doped" alkali halide crystals are often used to find the mobility of the cation vacancies. For this purpose it is important to know to what extent the vacancies and the impurity ions have associated together to form neutral "complexes," which do not c…
The lattice parameters of the isomorphous compounds MnAs, MnSb and MnBi have been measured over a temperature range which includes the temperatures at which certain magnetic transitions occur. Characteristic changes develop near the magnetic transition temperatures and are of two kinds: ( a ) discontinuous changes of…
The behavior of an air-fiber mixture is discussed. Measurements of the effective dielectric constant and power factor of yarns wound between cones have been made for a number of materials at various densities of packing, at frequencies between 50 c./sec. and 200 kc./sec., and at different moisture conditions. The resu…
In this final paper of a series on viscosity in the system CaO—MgO‐Al 2 O 3 SiO 2 data are presented for melts containing 60 and 65% SiO 2 . There also are diagrammatic presentations of the systems of isokoms at intervals on planes parallel to the zero alumina, zero lime, and zero magnesia faces of the tetrahedron, th…
(1954). The transition metals and their alloys. Advances in Physics: Vol. 3, No. 10, pp. 149-242.
The existence of 'fl-W' as a modification of tungsten is contradicted by the low density of the phase and by its decomposition into W and WO,. at about 700C. It is assumed that 'fl-W' is a metallic tungsten oxide with the probable ideal formula W30. The unit cell would then contain 6 W+20 atoms distributed at random o…