Materials Literature
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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…
The temperature dependence of the principal susceptibilities, ${\ensuremath{\chi}}_{\ensuremath{\parallel}}$ and ${\ensuremath{\chi}}_{\ensuremath{\perp}}$, of MnO are reported in the range of 4.2 to 300 K from the studies in a single crystal from which nonstoichiometries have been removed. A procedure combining selec…
The precipitation of calcium carbonate is of considerable importance in a wide variety of scale forming situations since carbonate concentrations in the environment are usually quite appreciable. As a first-formed solid phase, calcium carbonate may induce the growth of other scale minerals on its surface. Since the so…
Abstract The electrical transport properties in polycrystalline ferrous zinc ferrites, Zn x Fe 3− x O 4 ( x = 0, 0.2, 0.4, 0.6) and ferrous zinc–copper ferrites, Zn x Cu 0.1 Fe 2.9‐ x O 4 ( x = 0, 0.1, 0.2, 0.3, 0.4), are studied by measuring the conductivity and the Seebeck coefficient. The conductivity is shown to a…
SUMMARY An environmental scanning electron microscope (ESEM) has been developed which allows the examination of specimens at pressures up to 6 kPa. This new technique has been applied to the examination of live and wet plant specimens. The results are compared with those obtained using similar material that has been d…