Materials Literature
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Viscosity and electric conductivity measurements have been made on liquid beryllium fluoride over the temperature range 700–950°C. The high specific resistance and viscosity and the magnitude of the corresponding energies of activation indicate that the classical random network structure for glasses is applicable. Liq…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE PHOTOREDUCTION OF PORPHYRINS AND THE OXIDATION OF AMINES BY PHOTO-EXCITED DYESD. MauzerallCite this: J. Am. Chem. Soc. 1960, 82, 7, 1832–1833Publication Date (Print):April 1, 1960Publication History Published online1 May 2002Published inissue 1 April 1960https://pubs.acs…
Electron magnetic resonance studies of x-ray damaged crystals of potassium perchlorate indicate the presence of two types of stable paramagnetic defects at room temperature. One type of defect appears to be a trapped ClO/sub 2/ molecule. Findings are described. (C.H).
The diatomic and linear triatomic molecules such as the oxides and halides of the ``iron-group'' elements are of importance in high temperature systems. Although the various high symmetry compounds of these elements, e.g., the solid oxides, hydrated complexes, etc., are sufficiently understood in terms of the present…
Abstract Apparent activation energies for heterogeneous acid hydrolysis of four samples of cellulose which differed in crystallinity were calculated separately for the amorphous and crystalline regions, from data obtained under drastic hydrolytic conditions. Some approximate activation energies were also calculated fo…
The class of materials B2O3–H2O has been investigated over the range B2O3 to B2O3·3H2O. This includes ``dry'' glassy B2O3, ``wet'' glassy boron oxide of approximate composition B2O3·½H2O, monoclinic and orthorhombic forms of metaboric acid, B2O3·H2O, and triclinic orthoboric acid, B2O3·3H2O. The nuclear quadrupole int…
Data are given that graphically demonstrate space‐charge build‐up in a glass containing alkali and in a glass relatively free of alkali. The observed potential distributions show a decided asymmetry and have large potential drops near the electrodes with a linear potential change near the center of the sample. The obs…
The attenuation of the plane shock wave produced in a solid by a flying plate of the same material is treated neglecting dissipative processes and effects of material rigidity. Explicit formulas for the position of the shock front and the shape of the pulse as functions of time are obtained by application of Friedrich…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly Strained Cyclic Paraffin-SiloxanesWilliam A. Piccoli, Gerald G. Haberland, and Robert L. MerkerCite this: J. Am. Chem. Soc. 1960, 82, 8, 1883–1885Publication Date (Print):April 1, 1960Publication History Published online1 May 2002Published inissue 1 April 1960https://…
Experiments have been performed in which observations have been made in the presence of dc electric field bias of: (1) hysteresis loops, (2) double loops above the Curie point, (3) Kerr electro-optic effect above the Curie point and (4) capacitance above the Curie point in BaTi${\mathrm{O}}_{3}$. The purpose of these…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeresters. V.1 Di-t-butylperoxyoxalatePaul D. Bartlett, Erhard P. Benzing, and Richard E. PincockCite this: J. Am. Chem. Soc. 1960, 82, 7, 1762–1768Publication Date (Print):April 1, 1960Publication History Published online1 May 2002Published inissue 1 April 1960https://pubs.…
After a short introduction in which the notion of half-period zones is recalled, the axial intensity distribution of a zone plate, in the first-order approximation, is derived from diffraction theory. Its focal properties are then studied in some detail, including off-axis effects. Similarities in the axial distributi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallographic Data. 189. Zirconium CarbideC. P. Kempter and R. J. FriesCite this: Anal. Chem. 1960, 32, 4, 570Publication Date (Print):April 1, 1960Publication History Published online1 May 2002Published inissue 1 April 1960https://pubs.acs.org/doi/10.1021/ac60160a042http…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Effect of Structure on Reactivity in Semicarbazone Formation1Bruce M. Anderson and William P. JencksCite this: J. Am. Chem. Soc. 1960, 82, 7, 1773–1777Publication Date (Print):April 1, 1960Publication History Published online1 May 2002Published inissue 1 April 1960https:…
Microscopic observation, thermal analysis, measurement of electrical resistivity and X-ray study of WO 3 were carried out in relation to the phase transition from room temperature down to -70°C. The crystal of WO 3 is monoclinic ( a =7.30Å, b =7.53Å, c =7.68Å, β=90°54') at room temperature, and it transforms to tricli…
Phase equilibria in the ferrite region of the system FeO–MgO–Fe 2 O 3 have been investigated up to 1300°C. over an oxygen‐pressure range of 1.0 to 0.01 atmospheres. The five most important features of the equilibria in this system are as follows: (1) The spinel phase can exist with a deficiency of oxygen in the high‐m…
lieferte folgende Atomabstande: 1,62:J: 0,01 A fUr die tetraedrische Si-O-Bindung, 1,75:J: 0,02 A fiir die tetraedrische Al-O-Bindung und 2,37:J: 0,02 A fUr die Na-O-Bindung. Die Offnungen zwischen benachbarten Ketten der Faserzeolithe formen ziemlich weite Kanale, die die Struktur durchziehen. Die beobachteten Aus-ta…
A two year investigation of two freshwater alkaline lakes and two saline lakes in the Lower Grand Coulee has provided a quantitative and qualitative record of many of the seasonal changes occurring in the non‐planktonic algae. A glass plate method satisfactorily recorded quantitative changes in the attached algae. The…
Abstract Melting point depressions were determined by dilatometric and microscopic measurements for polyacrylonitrile in dimethylformamide and in γ‐butyrolactone. These data give for the glass transition and melting point of the pure polymer 104 and 317°C., respectively. Both the heat and entropy of fusion are low. Th…
(1960). DIMENSIONAL STABILITY OF PLAIN-KNIT FABRICS. Journal of the Textile Institute Proceedings: Vol. 51, No. 4, pp. P200-P209.