Materials Literature
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The energy levels of the nickel atom in all of its stages of ionization, as derived from the analyses of atomic spectra, have been critically compiled. In cases where only line classifications are reported in the literature, level values have been derived. Electron configurations, term designations, J-values, experime…
« Nematic lyotropic » phases are anisotropic fluids made of aggregates of amphiphilic molecules dispersed in water. Their nematic behaviour (flow, orientation in a magnetic field) is related to the orientational correlations between the aggregates which are anisotropic particles of finite dimensions. Therefore they ar…
The oil-soluble degradation products formed in heated samples of oil containing zinc di(n-, iso- or s-butyl)dithiophosphate (ZDTP) additives have been identified using 1H and 31P nuclear magnetic resonance spectroscopy. The final degradation product in each case is S,S,S-trialkyltetrathiophosphate, SP(SR)3. The interm…
Furutobeite, (Cu, Ag)₆PbS₄ is a new sulfide species discovered at the Furutobe mine, Akita Prefecture, Japan. It occurs only as minute (< 0.3 mm) grains intimately associated with stromeyerite, galena, sphalerite and tennantite in bornite from upper part of the stratabound sulfide ore zone consisting of sphalerite, ga…
Metastable SrSiO3 was formed during the course of the reaction between an equimolar mixture of SrCO3 and SiO2. The reaction was found to proceed in four stages, (1)–(4). The overall reaction of (1) and (2) was best described 2 SrCO3+ SiO2→ Sr2SiO4+ 2 CO2(1), SrCO3+ SiO2→ SrSiO3(metastable)+ CO2(2), SrSiO3(metastable)…
This paper deals with the genetic mechanism of the morphologies present in BaCO₃and CaCO₃ grown by silica gel technique at basic pH. Our results show that a siliceous matrix acting as support induces the whole morphology of the aggregate. Earlier, the existence of such a membrane was inferred from physico-chemical con…
The interaction of ethanol with clean and oxidized films of Ni, Pd and Al has been investigated in the temperature range 223–450 K. Dissociative adsorption of ethanol on the clean surfaces took place even at 223 K. Reversible molecular adsorption of ethanol occurred on oxidized Al films. Adsorption of ethanol on Ni an…
Complexes [Fe2IIIMIIO(MeCO2)6py3]py (M = Mg, Mn, Co, Ni, or Zn; py = pyridine), isomorphous(except for M = Ni) with the mixed-valence compounds [M3O(MeCO2)6py3]py (M = Mn or Fe), are reported; their magnetic properties provide new information about superexchange pathways in the trinuclear basic carboxylate system.
Infrared spectroscopic techniques have been used to study the effects of electron radiation on the polyimide PMDA-p, p'-ODA. The radiation exposures were made at various dose rates for a total dose approximately equal to that for 30 years of exposure to electron radiation in geosynchronous Earth orbit. At high dose ra…
"On the temperature-dependence of the threshold energy for atomic displacement in copper." Radiation Effects, 59(1-2), pp. 103–104
非鉄金属には従来コーキシング効果が見られないとされてきたが, 2017S-T4A1合金には明確なコーキシング効果が存在することがわかった.7 : 3 希鋼には明確なコーキシング効果は認められなかった.これらは, 平滑材における微小き裂のほか, 直径40~200μmの人工微小穴からでた微小き裂の挙動に注目することによって明らかになった.また, 疲労強度の低下に寄与する欠陥法を平滑材の疲労限における微小き裂との対応によって明らかにした.
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Abstract Single crystals of the composition 6 Ca 2 SiO 4 · 1 Ca 3 (PO 4 ) 2 have been grown by the Verneuil-method. The crystals represent a structure derivative of α′ -Ca 2 SiO 4 . Due to twinning of the crystals a structure determination was possible only on the basis of the weak superlattice reflections [ Pnm 2 1 ;…
Scheelite-related α-Ln2Mo3O12(Ln = La, Pr, Nd, Sm, Gd, Tb, or Dy) oxides are reduced by hydrogen at 780–870 K yielding molybdenum (IV) oxides of formula Ln2Mo3O9. The latter crystallize in a tetragonal scheelite (ABO4) type structure where one third of the A sites and a quarter of the anion sites are vacant: Ln2/3(□ca…
The valence-electronic structure of the actinide halides UF4, ThF4, UCl4 and ThCl4 has been studied by photoelectron spectroscopy in the gas phase using He II radiation and in the solid state using Al Kα radiation. These investigations show that both in the solid state and in the gas phase the electronic structures of…
The interaction of methanol with clean and oxidized films of Ni, Pd and Al has been investigated in the temperature range 223–450 K. Dissociative adsorption of methanol on the clean films occurred even at 223 K. A substantial fraction of the adsorption on oxidized Al film at 223 K was reversible. Further extensive ads…
Effects of air on the external SGEMP response of a cylinder in the x-ray deposition region (50 to 100 km) are examined. The gross external response of a missile is modeled using an object exposed to a variety of x-ray and air environments. Responses are computed using a macroparticle treatment for both primary and sec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVapor pressures of bromine-quaternary ammonium salt complexes for zinc-bromine battery applicationsSatya N. BajpaiCite this: J. Chem. Eng. Data 1981, 26, 1, 2–4Publication Date (Print):January 1, 1981Publication History Published online1 May 2002Published inissue 1 January 1…
5 argiles kaolinitiques du Westerwald ont été cuites à différentes températures entre 500 - 1200°C. Les changements minéralogiques ne sont pas très utiles pour des questions d'archéothermométrie dans l'intervalle 600 - 1000°C, sauf si une illite 2 M est présente, dont certains rapports permettent une estimation de la…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew furoxan chemistry. 1. Synthesis of diacylfuroxans by reaction of ethynyl acetates with nitrosyl fluoride nitrosonium tetrafluoroborateDavid R. Brittelli and George A. Boswell Jr.Cite this: J. Org. Chem. 1981, 46, 2, 312–315Publication Date (Print):January 1, 1981Publicat…