Materials Literature
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The thermal conductivity of KH 2 PO 4 , KD 2 PO 4 and KH 2 AsO 4 single crystals was measured in the temperature range from 4.5 to 300°K. For all the samples critical changes of the thermal conductivity are found at the Curie temperatures. The conductivity decreases gradually with falling temperature in the paraelectr…
Abstract The infrared absorption spectra of selected crystalline and noncrystalline bands were studied in bulk‐crystallized specimens of linear polyethylene which encompassed the extremely wide density range of 0.92–0.99 g./cm. 3 . The analysis of the data obtained at room temperature yield degrees of crystallinity by…
SUMMARY Three distinct species of the genus Nitzschia, lacking chloroplasts and therefore obligately heterotrophic, were isolated in pure culture from various marine shores. The organisms reproduced rapidly in a defined medium based on an artificial sea water supplemented with mineral nutrients, thiamine and cobalamin…
After almost 30 years of use, grain-oriented silicon—iron remains the most important soft ferromagnetic material where high permeability and low core loss are required. In this paper we show how grain structures which the metallurgist has learned to produce affect permeability at H=10 Oe and core loss at B=15 kG. Devi…
Over the temperature range −180° to 300°C, measurements have been made of the coercivity of 5:1 acicular γFe2O3 particles. Samples of two different lengths, 2000 and 6000 Å, were included in the study. The coercive force is linearly dependent upon two terms, shape (αM) and magnetocrystalline (βK/M). These may be separ…
Well-annealed bulk samples of the intermetallic compound FeRh exhibit a first-order transition from antiferromagnetic to ferromagnetic order on heating near 330°K. Plastic deformation has been found to convert the normal CsCl-type ordered structure of FeRh to a disordered fcc structure, which is only weakly magnetic a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of potassium permanganateGus J. PalenikCite this: Inorg. Chem. 1967, 6, 3, 503–507Publication Date (Print):March 1, 1967Publication History Published online1 May 2002Published inissue 1 March 1967https://pubs.acs.org/doi/10.1021/ic50049a015https://doi.org/1…
The magnetic susceptibilities of the dioxide and monocarbide of neptunium have been measured from 4.2 to 350°K. The inverse susceptibility of neptunium dioxide is linear in temperature above 60°K with an effective paramagnetic moment of 2.95 μB. A peak in the susceptibility-vs-temperature curve is observed at 25°K, in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of metal O,O-dialkyl phosphorodithioatesJoseph J. Dickert Jr. and Carleton N. RoweCite this: J. Org. Chem. 1967, 32, 3, 647–653Publication Date (Print):March 1, 1967Publication History Published online1 May 2002Published inissue 1 March 1967https://pubs…
Micro-nano plastics originating from the prevalent usage of plastics have raised increasingly alarming concerns worldwide. However, there remains a fundamental knowledge gap in nanoplastics because of the lack of effective analytical ...Plastics are now omnipresent in our daily lives. The existence of microplastics (1…
Graphite thermochemical response tested in simulated environment for use as thermal shield for hypersonic reentry vehicles
PbCrO3 has been synthesized in the high-pressure ``belt'' apparatus from PbO and CrO2 at 1150°C and a pressure in excess of 50 kbar. Single-crystal and powder x-ray diffraction at room temperature show the compound has the cubic perovskite structure with a0=4.00 Å. No deformation of the cubic structure was discerned i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic Anils. Mechanisms and Products of Photoreactions and Thermal ReactionsRalph S. Becker and W. Frank. RicheyCite this: J. Am. Chem. Soc. 1967, 89, 6, 1298–1302Publication Date (Print):March 1, 1967Publication History Published online1 May 2002Published inissue 1 M…
Abstract As is now well known, the use of an organic peroxide as a crosslinking agent for an elastomer was first reported by Ostromislensky in 1915. In this work benzoyl peroxide was used to cure natural rubber; similar acyl peroxides together with more recently discovered, less active, and more convenient dialkyl per…
Phase equilibrium relations in the system PbO–TiO 2 –ZrO 2 were studied by quenching in the range where the PbO content is 50 mole % and more. Isotherms were examined at 1100°, 1200°, and 1300°C and tie lines were determined between the liquid and solid solution in equilibrium. The incongruent melting point of PbZrO 3…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomogeneous Catalysis. IV. Some Reactions of Silicon Hydrides in the Presence of Cobalt CarbonylsA. J. Chalk and J. F. HarrodCite this: J. Am. Chem. Soc. 1967, 89, 7, 1640–1647Publication Date (Print):March 1, 1967Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Infared Spectra of Metalloporphyrins (4000-160 Cm-1)L. J. Boucher and J. J. KatzCite this: J. Am. Chem. Soc. 1967, 89, 6, 1340–1345Publication Date (Print):March 1, 1967Publication History Published online1 May 2002Published inissue 1 March 1967https://pubs.acs.org/doi/1…
The NaCl-type compounds Eu1−xGdxSe form a continuous series of solid solutions between the ferromagnetic insulator EuSe and the antiferromagnetic metal GdSe. We have studied the temperature dependence of electrical resistivity ρ, in Eu1−xGdxSe single crystals and polycrystals between 2.5° and 300°K; we find, in qualit…
A method for calculating the intensities of diffracted waves in low energy electron diffraction by crystals is proposed. The elastic multiple scattering is fully taken into account. The cellular method of KOHN and ROSTOKER in the band theory of metals is applied to the integral equation of the scattering by two dimens…
The solubility of boron in graphite was determined in the temperature interval of 1800° to 2500°C. The maximum solubility was 2.35 at. % at 2350°C; the solution was shown to be substitutional.