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The equilibrium pressure of the calcite-aragonite transition has been determined near 100 degrees C and is 4.35 kilobars. These data are in agreement with earlier work but conflict with the most recent determination by Simmons and Bell.
The temperature dependence of the spin-lattice relaxation time ${T}_{1}$ of trivalent rare-earth impurities in Ca${\mathrm{F}}_{2}$ has been measured at 9.6 kMc/sec using pulse saturation techniques. The rare earths investigated include Kramers ions (${\mathrm{Ce}}^{3+}$, ${\mathrm{Nd}}^{3+}$, ${\mathrm{Dy}}^{3+}$, ${…
The spectrum of Er3+ in single crystals of Y2O3 has been examined from 0.225 to 2.4 μ in absorption and fluorescence, and energy levels have been assigned. The Slater integrals and spin—orbit coupling parameter have been determined, which give the best over-all agreement between the centers of gravity of the observed…
Paramagnetic resonance of ${\mathrm{Yb}}^{3+}$ has been observed in single crystals of CaW${\mathrm{O}}_{4}$ at 20\ifmmode^\circ\else\textdegree\fi{}K and 3 cm. A tetragonal as well as two rhombic spectra were found. The tetragonal spectrum is fitted to an axial spin Hamiltonian with ${g}_{\mathrm{II}}=1.058\ifmmode\p…
Temperature dependence of the fluorescence quantum yield and decay time of several rare-earth chelates have been studied in an attempt to understand the quenching mechanisms in these compounds. It is observed that the quenching in either the ligand or the ion is reduced by lowering the amplitude of molecular vibration…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation A. B. Bestul, S. S. Chang; Excess Entropy at Glass Transformation. J. Chem. Phys. 15 June 1964; 4…
The distribution of magnetic moments in the Fe-Rh system has been investigated by the neutron diffraction technique in the composition range between 35 and 50 at.%Rh. These alloys have chemical order of CsCl type; the body-corner positions are occupied by FeI atoms and the body centers by Rh and FeII atoms. The magnet…
Abstract A transmission electron microscopy study has been made of the monoclinic to tetragonal phase transformation in thin films of zirconia. The films were prepared by the oxidation and subsequent recrystallization of zirconium foils. The transformation, which is rapid and reversible, is generally accompanied by tw…
Extraction of skin with 5M guanidine after salt and acid extraction yields a gelatin fraction which contains a greater proportion of double-chain (beta) components than can be accounted for by intramolecular cross-linking of collagen molecules. This fraction also contains a new beta-component, identified as the dimer…
Today corona measurements are used in many instances as part of testing electrical insulation materials and equipment. Also, corona tests are performed for other purposes The prerequisite for obtaining economical benefits from corona testing is a sufficient understanding of the nature of corona, its effects on materia…
In the Peace River area of northern Alberta difficulty has been encountered in adopting the new Canadian classification scheme to a series of soils which occur under similar environmental conditions but still reflect varying degrees of profile development. The variation in profile development ranges from what appears…
The anodic polarization of chromium and 18Cr-8Ni stainless steel has been investigated in 2 to 48 percent hydrofluoric acid, 40 percent sulfuric acid, and in a solution containing 5 percent hydrofluoric acid and 40 percent sulfuric acid. Chromium can be anodically protected in hydrofluoric acid. The corrosion rate of…
Abstract Polyfunctional monomers such as allyl methacrylate, allyl acrylate, and diallyl maleate have been found to greatly enhance the radiation crosslinking of polyethylene. The radiation dose for incipient gelation is decreased by a factor of approximately 25 by the presence of small amounts of these monomers. The…
The electrode potentials of the system Th, ThCl 4 (KCl, NaCl) were measured at various concentrations of thorium chloride, and at temperatures between 670 °C and 850 °C, using a silver – silver chloride reference electrode. It was shown by a direct gravimetric method that the reaction,Th (metal) + ThCl 4(melt) = 2ThCl…
NaBr.2H20 is monoclinic, P21/c, Z=4, with a=6.575, b=10.456,c=6-776 /~ and fl=113-38 °.The structure agrees very well with that determined independently by Culot, Piret & Van Meersche (1962); the differences are attributed chiefly to different absorption errors.
Dielectric, ferroelectric, and piezoelectric properties were investigated for compositions in the high‐lead hafnate region of the system PbHfO 3 ‐PbTiO 3 ‐PbSnO 3 ‐PbNO 2 O 6 . Phase diagrams were prepared that show the existence of a ferroelectric‐to‐antiferroelectric phase transition with increasing temperature. Fiv…
Three main types of crack formation in plastically deformed MgO crystals have been observed. They are all due to internal stresses of macroscopic character resulting from the difficulty of mutual penetration of perpendicular dislocation bands and the consequent geometrical incompatibilities of plastic deformation. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Structures of Nitrogen Oxide-Boron Trifluoride ComplexesJ. C. Evans, H. W. Rinn, S. J. Kuhn, and G. A. OlahCite this: Inorg. Chem. 1964, 3, 6, 857–861Publication Date (Print):June 1, 1964Publication History Published online1 May 2002Published inissue 1 June 1964https://p…
The six complex hexagonal and rhombohedral layer structures known as hexagonal ferrites can be derived by stacking three building-block types, S , R , and T , having 2, 3, and 4 anion layers, respectively. The anion framework of R and T contains stacking reversals after each layer; the stacking sequence of R is 1·1·1,…
ZnS platelets grown from the vapor phase, bounded by (2̄11), (011̄), and (111) faces, were used. The crystals showed birefringence bands perpendicular to the [111] axis. X-ray rotation, oscillation, and Laue photographs showed that the bands are due to changes in crystal structure (cubic, hexagonal, and polytypes) and…