Materials Literature
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Abstract With the purpose of obtaining information needed for hazard prevention, pure liquid dialkyl peroxides (di-t-butyl peroxide (1), bis(1-methyl-1-phenylethyl) peroxide (2), t-butyl 1-methyl-1-phenylethyl peroxide (3), 2,5-bis(t-butyldioxy)-2,5-dimethylhexane (4)) were subjected to thermal-decomposition experimen…
Dislocation damping as a function of strain amplitude following quenching and during 1-MeV electron irradiation was investigated by measuring Young’s modulus and the logarithmic decrement in high-purity polycrystalline copper. A ’’peaking effect,’’ an initial increase and subsequent decrease in the damping, was observ…
A method is presented for localizing molecular orbitals, based on diagonalizing subunits of the density matrix. First, nonbonding orbitals are found by diagonalizing the monatomic subunits; then, diatomic sigma or pi bonding and antibonding orbitals are obtained from the diatomic subunits for all bonded pairs of atoms…
The radical anions of methyl-, methoxy-, fluoro-, cyclopropyl-, and cyanocyclooctatetraene were generated by electrolytic reduction of the neutral compounds in liquid ammonia.The electron spin resonance spectrum of each radical anion is assigned, and a clean even-odd alternation of the spin densities is observed in ea…
Abstract Na 2 S 2 CO 3 crystallizes in 4 modifications. The familiar monoclinic a-form stable at ambient temperature transforms into the trigonal β-form at 330 °C which at 388 °C converts to b ccy-Na 2 S 2 O 3 . These transformations are reversible. Unstable orthorhombic α'-Na 2 S 2 CO 3 (Pna2 1 ) is obtained by dehyd…
Abstract A magnesian halotrichite [(Fe 0.63 Mg 0.37 ).Al 2 (SO 4 ) 4 .22H 2 O] from a fumarole deposit on the active andesitic volcano of White Island, New Zealand, occurs as the major component in the mixture halotrichite—H 2 S0 4 ‐H 2 0—alunogen, with accessory gypsum, alunite, anhydrite, quartz, cristo‐balite, and…
Abstract Two new intermetallic compounds K 3 Ag 3 As 2 and K 3 Cu 3 As 2 have been prepared and their crystal structures determined. They crystallize in the rhombohedral space group R3̅m with K 3 Cu 3 As 2 : a = 576(2) pm, c = 2026(5) pm, K 3 Ag 3 As 2 : a = 599(2) pm, c = 2135(4) pm. and are isotypic to K 3 Cu 3 P 2
Abstract A procedure is described which permits the classification of solvents according to their effect on polycarbonate (PC): Class I—dissolve amorphous or crystalline PC Class II—dissolve only amorphous PC Class III—convert amorphous PC to crystalline PC Class IV—none of the above. This classification is achieved b…
The EPR spectrum of polychromatic glass continuing Ce3+ and Ce4+ and after exposure to long wavelength UV light is reported. The EPR center is identified as Sh4+. (AIP)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of complexes of lanthanide nitrates and isonicotinic acid hydrazide, Ln(NO3)3.3INH.3H2OL. B. Zinner, D. E. Crotty, T. J. Anderson, and M. D. GlickCite this: Inorg. Chem. 1979, 18, 7, 2045–2048Publication Date (Print):July 1, 1979Publication History Pu…
Abstract The viscosity of PVC plastisols is seen to be affected by numerous variables. Increase in concentration of the resin causes the viscosity to rise, with the increase being more abrupt at the higher concentrations. Deviation from Newtonian behavior also increases with concentration. Decrease in the size of part…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of phosphazenes. 9. Reactions of (primary amino)chlorocyclotetraphosphazenes with dimethylamine: formation of "bicyclic" phosphazenesS. S. Krishnamurthy, K. Ramachandran, Arjun C. Sau, Robert A. Shaw, A. R. Vasudeva Murthy, and Michael WoodsCite this: Inorg. Chem. 19…
Two adult patients ingested an overdose of 2.4 g and 8.0 g of sotalol hydrochloride, respectively, i.e. 7-25 times the mean daily dose. Certain signs as bradycardia and hypotension were similar to those described for other beta-blocking agents. In addition to these, however, both patients had severe cardiac tachyarrhy…
The stable and metastable phase relations in the system Ph 2 SiO 4 ‐PhSiO 3 , were reexamined using Raman and ir spectroscopy to characterize the phases. Three stable phases, H‐Ph 2 SiO 4 , M‐Ph 2 SiO 4 , and M‐Ph 2 SiO 4 (alamosite) and four metastable phases, L‐Ph 2 SiO 3 , phase X , L‐PhSiO 3 and hexagonal PhSiO 3…
The recovery process of deuterium dissolved in excess in nickel was studied by means of the liquid hydrogen quenching and electrical resistivity measurement developed by the author. The diffusion coefficient of deuterium was determined as D =3.18 ×10 -3 exp (-9220/ R T ) cm 2 /sec between 220 K and 340 K, and compared…
The viscosity of a sodium borosilicate glass (SiO 2 70, B 2 O 3 23, and Na 2 O 7 wt%) was measured as a function of heat‐treatment temperature and time for phase separation. The viscosity was shown to approach an equilibrium value unique to the heat‐treatment temperature. The magnitude of the equilibrium viscosity inc…
A seeded growth method has been used to study the kinetics of crystallization of calcium sulfate dihydrate at various temperatures and at ionic strengths up to 0.6M. Under all conditions, the rate of reaction is proportional to the square of the relative supersaturation and is controlled by a surface process. The same…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of sodium carbonate perhydrate in the solid stateAndrew Knox. Galwey and William John. HoodCite this: J. Phys. Chem. 1979, 83, 14, 1810–1815Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue 1 July 1979h…
The structures of Mn5Si3, Th6Mn23 andγ-brass are accurately derived from octahedra (Mn5Si3), tetrahedra and triangle-capping. The relationship between pyrochlore, Th6Mn23 and γ-brass is also derived.
The metalloid content dependence of zero magnetostrictive composition of an amorphous (FexCo1−x)100−y(Si0.4B0.6)y alloy in an as-quenched state is experimentally determined. The iron content (x) of the zero magnetostrictive composition was found to decrease with an increase in the metalloid content (y). The Curie temp…