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。
We have measured the Raman scatterings of V 2 O 3 and (V 0.985 Cr 0.015 ) 2 O 3 in the temperature range between 300 and 600 K. The Raman frequencies of A 1 g phonon modes in V 2 O 3 show some softening and recovery with a minimum at 480 K in the region of the high temperature transition. Those in (V 0.985 Cr 0.015 )…
The electronic transition between the $^{4}T_{1}$ and $^{6}A_{1}$ states of the ${\mathrm{Mn}}^{2+}$ ion in CsMn${\mathrm{Cl}}_{3}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O has been observed to be weak compared to the same transition in other hosts, due to vibrational quenching. We have observed f…
The thermal convective instability of a nematic layer aligned perpendicular to horizontal plates displays original characteristics, due to the coupling of the nematic distortion with the temperature gradient; in particular the adverse temperature gradient threshold Δ T c can be modified by the application of a vertica…
The corrosion behavior and the degradation of the gray cast-iron pipes, which had been buried for 22 to 79 years and used for natural water, have been investigated. The rate of the graphitic corrosion of pipes was in the range of 0.167 to 0.25mm/yr. The graphitization reduced the real wall thickness so that the streng…
Abstract Bei der Herstellung von Phenolharzen vom Novolak‐ und Resol‐Typ wurde die Mitverwendung von Stärken und Stärkehydrolysaten untersucht; die Kohlenhydrate wurden hierbei in situ durch saure Katalyse zu 5‐Hydroxymethylfurfural (HMF) dehydratisiert, das in Gegenwart von Phenol und Formaldehyd in die Harze eingeba…
In order to obtain adequate friction-welding conditions for high alloy steels, an austenitic stainless steel (SUS304), a martensitic stainless steel (SUS440C), a high-speed steel (SKH9) and a 0.45% carbon steel (S45C) were used as test materials. The adequate welding conditions under which friction welded joints with…
From studies of the influence of controlled introduction of defects into the Pb and O sub-lattices of PbZrO3 it was ascertained that marked changes are caused in the dielectric parameters and the transitions between the antiferroelectric and ferroelectric states and the ferroelectric and paraeiectric states. With incr…
Abstract The thermal decomposition of this resin was examined by quantitative pyrolysis—gas chromatography. The decomposition does not follow the Hurd–Blunck mechanism generally obeyed by beta‐hydrogen containing esters. Instead, phthalic anhydride is extruded almost quantitatively. It is proposed that the mechanism i…
The aglycone portion of the glycosides of the chinese crude drug "Pai-ch'ien" was investigated. Three new compounds named glaucogenin-A (1), -B (3), and -C mono-D-thevetoside (8) were isolated and their structures were characterized on the basis of spectroscopic and chemical evidence, and that of 8 was determined by X…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComments on the formation of bis(catecholato)borates. Potassium bis(4-methylcatecholato)borate(III)Lucia Babcock and Richard PizerCite this: Inorg. Chem. 1983, 22, 1, 174–176Publication Date (Print):January 1, 1983Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelations of axial ligand field strength and zero-field splittings in the carbon-13 NMR spectra of five- and six-coordinate high-spin iron(III) porphyrin complexesHarold M. Goff, Eric T. Shimomura, and Martin A. PhillippiCite this: Inorg. Chem. 1983, 22, 1, 66–71Publicati…
La phase monoclinique de l'oxyde de manganèse complexe (La0,8Ca 0,2)MnO3 préparé par la méthode de co-précipitation présente un comportement magnétique particulier : l'aimantation diminue très rapidement à une température de 30 °C inférieure au point de transition ferromagnétique, où la résistivité électrique change.…
The relationship between the microstructure and properties of high-speed steels has been examined, with particular reference to fracture toughness (as measured by KIC) and fatigue-crack growth rates. Different microstructures have been obtained by varying the heat-treatment parameters - austenitizing temperatures and…
The possibility of an ignition event leading to component combustion is a significant consideration in the design and operation of all oxygen production and handling systems. Most materials of construction can react violently with oxygen if ignition occurs. This paper discusses some of the current concepts of ignition…
Three new types of corrosion-resistant steel sheets for automotive body panels have been developed.1) Zinc-nickel alloy electroplated steel sheet2) Two-layer zinc-iron alloy electroplated steel sheet3) Organic composite-coated steel sheetWith their protective coating alloyed, applied in two layers or composited, these…
The kinetics of the decomposition of [PW12O40]3–(1.5 × 10–5 mol dm–3) to [WO4]2– and [PO4]3– has been studied in the range pH 7–9 at an ionic strength of 0.1 mol dm–3. The reaction proceeds via the intermediates [PW11O39]7– and [PW9O34]9–. Only the final stage, the hydrolysis of [PW9O34]9–, was studied in detail. The…
The nove approach is proposed to the synthesis of dyes with negative dichroism. The molecular models, which are adequate to the dichroic dyes, are shown. As an example of the approach, the synthesis and dischroic properties of some derivatives of the 2,2′-azomidazole are described. The time and contrast chracteristics…
The role of sulphide inclusions in the pitting and crevice corrosion of stainless steels is reviewed. It is noted that manganese sulphides, particularly those containing a central oxide core, are the most favourable sites for pit initiation. Replacing the manganese in the sulphide by chromium renders pit initiation mo…
Carbon tends to suppress the grain boundary fracture (GBFR) of α-iron, which is promoted by the segregation of phosphorus and other impurities to grain boundaries. This effect of carbon is due to its grain boundary segregation. It is shown in the present paper that the same effect of carbon is observed when hydrogen i…
The high temperature form of melanophlogite, 46 Si02. 6MI4 .2M12(M12 =CH4, N2; M14= C02, N2), is cubic with space group Pm3n and a= 13.436(3) A at 200°C. The mineral is isostructural with the cubic gas hydrates of type 1. Structure refinement with 667 independent reflections led to a weighted Rw= 0.040. Corner-sharing…