Materials Literature
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An exothermic transition is observed near 400°CC on thermal dehydration of highly crystalline AI 2 (SO 4 )3.16H 2 O, Al 2 (S0 4 ) 3 14H 2 O, and Al 2 (S0 4 ) 3 9H 2 O when the early stages of heating are carried out in vacuum. Amorphous or partially crystalline hydrates do not show the exotherm. No systematic relation…
Orthorhombic unit-cell constants for SrRE2O4 (RE = Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, In and Y) have been determined by refinement of X-ray powder diffraction data. Unit-cell volumes are plotted against the cube of the trivalent rare-earth ionic radius.
Abstract This modification of sodium sulfate exists between 200 ° C to 228 ° C. Single crystals of Na 2 SO 4 III are grown by metastable nucleation from aqueous solutions at 50 ° C. Sodium sulphate III is orthorhombic with space group Cmcm and cell constants a = 5.607 Å, b = 8.955 Å, c = 6.967 Å, Z = 4. The structure…
Abstract Crazing was investigated in two commercial polystyrene/polybutadiene block copolymers made by the Phillips Petroleum Co. and marketed under the trade names of KRO‐1 and KRO‐3 resins. The two block copolymers each with 23% polybutadiene (PB), have radically different microstructure and radically different craz…
Abstract The crystal structure of the alums, (NH 3 CH 3 )Al(SO 4 ) 2 · 12H 2 O and (NH 4 )Al(SO 4 ) 2 · 12H 2 O, has been determined and refined from X-ray and neutron diffraction data. The compounds crystallize cubic in space group Pa 3 ( Z = 4) with a 0 = 12.322(3) Å and a 0 = 12.242(1) Å respectively. The positiona…
The literature on the viscosity behavior of liquid crystals is reviewed with emphasis on the experimental results. These results are discussed in terms of the mesophase structure. Discussion of polymeric liquid crystals has been excluded since they have recently been reviewed.
The saturation induction Bs and the relation between Curie temperature Tc and crystallization temperature Tx were systematically studied for Co-rich (FeCo)100−y(SizB1−z)y systems with zero magnetostriction in the range of 20⩽y⩽30 and 0⩽z⩽0.6. With increasing metalloid content y, Bs and Tc decrease and Tx increases. Sm…
The temperature rise during the adiabatic polymerization of acrylamide in water has been used to characterize the kinetic parameters. Based on initial rate data, the following equation is obtained: where concentrations of monomer, persulfate, and bisulfite are in mole/kg, T is in K, and t is in min. The order with res…
Abstract An experimental and theoretical study was carried out to achieve a better understanding of bubble dynamics in foam extrusion through a converging die. For the experimental study, a number of converging channels were constructed of aluminum, with glass windows on both sides. Bubble dynamics in the flow channel…
X-ray and optical studies in the paper show that dodecyl benzene sulfonic acid and the mixtures of its sodium salt with (i) water and (ii) methane sulfonic acid exhibit the smectic A phase. Interference studies are described in the paper to establish the molecular orientation in the droplets and batonnets.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculated magnetic properties of some isomers of pyracyleneJ. A. N. F. Gomes and R. B. MallionCite this: J. Org. Chem. 1981, 46, 4, 719–727Publication Date (Print):February 1, 1981Publication History Published online1 May 2002Published inissue 1 February 1981https://doi.org…
Using inelastic neutron scattering the phonon dispersion relations in a single crystal of face centered cubic Fe 0.7 Mn 0.3 have been determined at several temperatures above and below the Néel temperature of 412 K. The shifts of the frequencies of the [110] T 1 mode below T N have been observed, which eventually give…
D. G. MANN; A Note on Valve Formation and Homology in the Diatom Genus Cymbella, Annals of Botany, Volume 47, Issue 2, 1 February 1981, Pages 267–269, https://d
Elastic energy dissipation (internal friction) peaks, arising from both stress-induced, bulk lattice rearrangements of hydrogen interstitials (H (1) peak) and hydrogen dislocation interactions (H (2) peak), have been investigated over a wide range of the hydrogen content in alpha + beta and beta phase concentration ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox reactions of copper in zeolite A. Four crystal structures of vacuum-desolvated copper-exchanged zeolite A, Cu8-AHan Sik Lee and Karl SeffCite this: J. Phys. Chem. 1981, 85, 4, 397–405Publication Date (Print):February 1, 1981Publication History Published online1 May 200…
Abstract Circular dichroic spectra and oscillator strengths of the π‐π transition near 190 nm are calculated for helical (Gly) 6 and (Ala) 6 at 30° intervals of the backbone torsion angles (ϕ,ψ) over the range ‐180° ≤ ϕ ≤ ‐60°, −60° ≤ ψ ≤ 180°, using the partially dispersive normal mode treatment of the dipole interac…
Indexed powder patterns of the monoclinic phase, stable at room temperature, and of the orthorhombic phase, stable for T > 786 K, are given. The cell dimensions are: a = 15.737 (8), b = 9.231 (5), c = 18.224 (9) Å, β = 125.46 (2)° at 295 K; a = 9.330 (3), b = 12.868 (5), c = 9.242 (3) Å at 818.6 K. Linear equations de…
Redox potential measurements on platinum and Type 304 stainless steel in equilibrium ( or ) and nonequilibrium boric acid/lithium hydroxide solutions at 275°C are reported. For equilibrium systems containing hydrogen, good agreement was obtained between the measured potentials on platinum and calculated equilibrium po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe sense of Jahn-Teller distortions in octahedral copper(II) and other transition-metal complexesMalcolm GerlochCite this: Inorg. Chem. 1981, 20, 2, 638–640Publication Date (Print):February 1, 1981Publication History Published online1 May 2002Published inissue 1 February 19…
Molybdenum considerably reduced reversible temper embrittlement (RTE) of 12%Cr martensitic stainless steels by scavenging P in the matrix, which decreased P segregation to the grain boundaries. Contrary to the case of many low-alloy steels, Mo additions as large as 1 wt-% were still beneficial, due to the lower C cont…