Materials Literature
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The influence of oxoacidity on the corrosion of iron in molten sodium nitrate‐nitrite mixtures has been demonstrated by means of potential‐ p O 2− diagram. Oxoacidobasic titrations of iron(III) have been carried out by means of potentiometric measurements with an yttria‐stabilized zirconia membrane electrode, indicato…
p-アシロキシ安息香酸を液状パラフィンまたはサームS800 (R) 中で重合させることにより, 針状のポリ (p－オキシベンゾイル) 結晶を得た. 重合は静止状態330℃で360分間行った. 得られた針状結晶の密度は, 1.50～1.51g/cm3で単位格子の大きさから求めた結晶密度1.52g/cm3に非常に近い値を示した. また, X線粉末図形では非晶部に基づくピークは認められなかった. 更に, 他の形態を持つ結晶と比較して高い転移温度及び分解温度を示した.これらの事実からこの針状結晶が高分子ウイスカーであることが強く示唆された.
Electronic spectroscopic data are reported for CoI, CoII, and CoIII mononuclear tetra(neopentoxy)-phthalocyaninate(2–)(L1) and bridged binuclear tri(neopentoxy)phthalocyaninate(2–) species in solution and film phases. Electrochemical data show that the [CoIIL1] species cannot exist in a non-co-ordinating or weakly co-…
The oxidation kinetics of Zircaloy-4 in steam have been extended to 2400°C. Growth of the ZrO2 and α-Zr(O) layers display parabolic behavior over the entire temperature range studied; however, a discontinuity in the oxidation kinetics above 1510°C causes rates to increase above those previously established by the Bake…
The strength of obstacles impeding the motion of dislocations has been studied using an etch hillock technique. Plate tin single crystals (99.999 mass% purity) were stretched in the [110] direction by a creep-testing apparatus. When applied shear stresses on the [100](010) slip system were more than 55 kPa, all the pr…
Effects of CaO and SiO2 additives on the magnetic properties, density and microstructures of the sintered compacts of Sr-ferrite were investigated. It was revealed that CaO and SiO2 additives play important roles of rapid densification and grain growth controll through the sintering process of Sr-ferrite compacts. EPM…
Abstract It could be shown that the structure of poly(styrylpyridine)s (PSP), which are heat resistant thermosetting resins resulting from the polycondensation of 2,4,6‐trimethylpyridine ( 1 ) with terephtalaldehyde ( 2 ), is much more complicated than that expected from this polycondensation. 2‐Styrylpyridines were s…
Presented in this paper are the effects of temperature on the early age properties of two rapid-hardening magnesium phosphate-based cements and their combinations, as follows: (a) magnesium phosphate cement for cold and regular weather use; (b) magnesium phosphate cement for hot weather use; (c) a 50-50 blend of magne…
Dielectric behaviour of (Ba, Ca) TiO3 ceramics prepared by conventional and a novel technique has been studied as function of temperature and frequency. It is shown that by ensuring uniform distribution of Ca2+ ions in the BaTiO3 matrix, the transition from the ferroelectric to the paraelectric phase becomes more diff…
This paper summarises methods used and results obtained in calculations on point defect processes in UO2. Enthalpies and entropies are calculated for basic defect formation, ion migration and charge transfer.
Abstract Organotin stabilizers of the type Bu 2 SnX 2 (X = SCH 2 CO 2 C 8 H 17 or O 2 CCHCHCO 2 C 8 H 17 ) present in poly(vinyl chloride) (PVC) and subjected to varying doses of gamma irradiation in the range 1–200 kGy (0.1–20 Mrad) are shown to suffer degradation with dealkylation to form monobutyltin trichloride a…
A new process for producing porous aluminum by the foaming technique was developed. In the process, molten aluminum into which Ca has been added before the stage of viscosity rise is stirred to disperse oxide films into the melt. Adding Ca results in considerable shortening of the time for viscosity rise because of pr…
Recently we introduced a new computational tool for the analysis of waveguide diffraction gratings based on Rouard’s method, a recursive technique used in thin-film coating design. In this paper we compare the reflectivities predicted by Rouard’s method with those found by using the ideal mode expansion of coupled-mod…
Abstract A series of partially neutralized poly(acrylates) has been prepared, and reactions occurring on heating them at 250°C have been studied. It was found that different chemical processes occurred at this temperature, depending on the nature of the counter ion. Univalent cations gave films of excellent chemical r…
It is shown that electrochemical observations (over a small range of overpotentials) which may be subject to relatively small (< 1%) experimental inaccuracies can lead to results that are seriously (> 100%) in error when analysis of the results is performed using traditional analysis techniques.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarized, single-crystal, electronic spectral studies of hexachlorodicuprate(2-): excited-state effects of binuclear interactionSylvie R. Desjardins, Dean E. Wilcox, Ronald L. Musselman, and Edward I. SolomonCite this: Inorg. Chem. 1987, 26, 2, 288–300Publication Date (Prin…
The authors investigated the impulse breakdown characteristics of coated high-voltage electrodes in SF6 gas with a varying nonuniform factor, electrode area, and coating material. From the viewpoint of the relation between breakdown stress and the stressed electrode area, it was clarified that with coated electrodes,…
Bioactivity-guided fractionation of a CHCl3 extract of Stizophyllum riparium has afforded six new compounds, namely, the triterpene esters, 3 beta-hydroxy-24-transferulyloxyurs-12-en-28-oic acid, 3 beta-hydroxy-24-cis-ferulyloxyurs-12-en-28-oic acid, 3 beta, 19-dihydroxy-24-trans-ferulyloxyurs-12-en-28-oic acid, and t…
The perchlorotriphenylmethyl radical (2) acts as a clathrate host for benzene, halogenobenzenes, and 1,4-dioxane giving inclusion compounds with different stabilities; the structure of (2)·C6H6, established by X-ray diffraction, shows the guest molecules located in channels between the hosts.
The crystal structure of kalsilite at 950°C has been determined by high temperature single crystal methods. In the process of heating, the X-ray powder pattern of kalsilite changes at 865°C, which can be ascribed to the phase transition of this mineral. According to the drastic apparition of the extinction of hhl, 1-o…