Materials Literature
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We have computed the renormalization of the conduction-electron energy in a degenerate ferromagnetic semiconductor at zero temperature due to the virtual emission and reabsorption of spin waves. We find that as a result of the difference between the up- and down-spin Fermi momenta, this renormalization is quite small.…
The lattice parameters and the quadrupole splittings of the room-temperature Mössbauer spectra of the cubic A 2 FeSbO 7 pyrochlores (A = Sm, Eu, Gd, Tb, Y, Er, Lu) have been found to vary linearly with the Templeton–Dauben radii of the A 3+ ions. The variation of the quadrupole splitting can be correlated with the pos…
The polarization characteristics of the blue-copper luminescence in a cubic ZnS:Cu, I (Cl, Al or Ga) single crystal grown from the melt were investigated. The polarization with particular azimuthal dependences is observed under polarized characteristic excitation, indicating that the center has its own symmetry lower…
The recovery of neutron-irradiation-induced defects in tungsten has been investigated via isochronal resistivity studies after irradiations from 8.5\ifmmode\times\else\texttimes\fi{}${10}^{17}$ to 1.5\ifmmode\times\else\texttimes\fi{}${10}^{21}$ $n$ ${\mathrm{cm}}^{\ensuremath{-}2}$ (${E}_{n}>1$ MeV). These studies…
An optical transition at 1.986 eV in ZnTe has earlier been attributed to the radiative recombination of an electron-hole pair bound at an oxygen atom substituting isoelectronically for Te. In this paper the results of isotopic substitution and Zeeman experiments are offered to prove the correctness of this identificat…
The infrared spectra of acetonitrile and acetonitrile-d3 have been studied at − 50°C for the high-temperature (β) crystalline phase and at − 65°, − 115° and − 192°C for the low-temperature (α) crystalline phase. A powder x-ray pattern obtained at liquid-nitrogen temperature indicates that the unit cell is primitive or…
Magnetic perovskites BiMnO 3 and BiCrO 3 were synthesized under very high pressures. There are phase transitions at 500°K and 410°K at atmospheric pressure for BiMnO 3 and BiCrO 3 respectively, and the crystal distortion of each phase was determined. BiMnO 3 is ferromagnetic below 103°K, while BiCrO 3 is inferred to b…
The thermoreflectance spectra of Si, AlSb, GaP, GaAs, GaSb, InP, InAs, InSb, ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgSe, and HgTe are reported. Measurements were made on most materials at both room and liquid-nitrogen temperatures. The positions of the peaks observed are compared with previous reflectance and electro…
Abstract Die Porphin‐Synthese aus in α‐Stellung unsubstituierten Pyrrolen und Aldehyden (Weg II im Schema S. 184) wird verbessert. ms ‐Tetraphenylporphin (4) und eine größere Anzahl weiterer ms ‐substituierter Porphine (Tab. 1) sind so auf einfache Weise rein und in guter Ausbeute zugänglich. Auch der raumerfüllende A…
Electron-spin-resonance spectra of N, P, As, and H atoms trapped in matrices formed from rare-gas elements at 4.2\ifmmode^\circ\else\textdegree\fi{}K have been studied. The isotropic hyperfine coupling of N and P increases with the atomic number of the matrix element whereas that of As decreases. The van der Waals int…
The magnetic susceptibilities of orthorhombic single crystals of CsMn${\mathrm{Cl}}_{3}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O have been measured along the $a$, $b$, and $c$ axes between 0.35 and 77\ifmmode^\circ\else\textdegree\fi{}K. Above \ensuremath{\sim}9\ifmmode^\circ\else\textdegree\fi{}…
Abstract In the textile industry as a whole the pattern of machine layout and operation has been changed little over the years. Banks of machines, housed in large factory areas, are crowded together to preserve floor space and optimize production in both the natural and man-made fibres industries. Noise in the mills a…
The growth mechanism and crystalline texture of solution-grown crystals of poly(vinyl alcohol) have been studied by electron microscopy. From morphological data it is shown that single crystals of poly(vinyl alcohol) (PVA) have two growth faces, i.e., the (100) and (101) fold planes. It is suggested that the parallelo…
The diatom Navicula endophytica sp. nov., first observed by Baardseth (1966) in the intercellular substance of receptacles of Ascophyllum nodosum, is described. The species has been encountered neither as an epiphyte on this seaweed nor as a planktonic form.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-delocalization mechanisms in some paramagnetic tris-2,2'-bipyridine complexes of nickel(II)Mark L. Wicholas and Russel S. DragoCite this: J. Am. Chem. Soc. 1968, 90, 25, 6946–6950Publication Date (Print):December 1, 1968Publication History Published online1 May 2002Publ…
Ferromagnetic nickel-copper alloys can be charged with cathodic hydrogen in high concentrations whereby they loose their ferromagnetic behavior. Measurements of magnetization of these alloys show a quicker absorption of hydrogen compared to nickel. The interstitial occlusion of hydrogen gives rise to a reversible latt…
The spin-wave stiffness D of iron-palladium alloys containing 10, 22, 40 and 100 at.% iron has been measured by the neutron small-angle-scattering technique. The values of D are consistent with those derived from low-temperature saturation magnetization and specific heat measurements on alloys with iron concentrations…
Summary Hydrothermal studies in the silica-rich region of the CaO-SiO 2 -H 2 O system have given information on the stability field of tobermorite. At saturated steam pressures tobermorite is unstable relative to xonotlite (C 6 S 6 H) above 140 °C but between 10 000 and 40 000 lb/in. 2 (69 and 276 N/mm 2 ), the decomp…
Abstract Es gelang erstmals, Einkristalle der monoklinen B‐Form von Tb 2 O 3 darzustellen. Eine Röntgenstrukturuntersuchung zeigt, daß BTb 2 O 3 in der Raumgruppe C ‐C2/m kristallisiert und mit BSm 2 O 3 isotyp ist.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphorus-31 nuclear magnetic resonance studies of coordination compounds. I. Stereochemistry of some complexes with multidentate ligandsJames W. Dawson and Luigi M. VenanziCite this: J. Am. Chem. Soc. 1968, 90, 26, 7229–7233Publication Date (Print):December 1, 1968Publicat…