Konrad Hesse、Siegfried Hünig1985-04-15Liebigs Annalen der Chemie
Abstract Die synthetisierten farbigen α‐Styrylpyrylium‐Salze 2, 4 und 6 werden größtenteils im kristallinen Zustand zu den farblosen Cyclobutanen 7, 8 und 9 photodimerisiert (inverse Photochromie), deren r‐ctt ‐Konfiguration nachgewiesen wird. Bestrahlung von 2h in Lösung erzeugt u. a. das unerwartete Bispyrylium‐Salz…
Radical Photochemical ReactionsFluorine in Organic ChemistryPhotochromic and Fluorescence Chemistry
A. Miotello、P. Mazzoldi1985-04-15Physical Review Letters
Cooperative effects during both alkali-Ca and Na-K migration under electron irradiation of glasses have been pointed out for the first time by analysis of experimental data in the framework of the thermodynamics of irreversible processes.
Glass properties and applicationsElectron and X-Ray Spectroscopy TechniquesNuclear materials and radiation effects
T. Kamimura、H. Ido、K. Shirakawa1985-04-15Journal of Applied Physics
MnAlGe is a ferromagnet with a unique crystal structure including two-dimensional arrays of Mn atoms in it. In order to find the magnetic properties characteristic of this structure, magnetic and electric measurements were made for Mn0.9M0.1AlGe (M:Mn, Cr, Fe) and MnGaGe. It has been found that the susceptibility abov…
Magnetic and transport properties of perovskites and related materialsMagnetic Properties of AlloysHeusler alloys: electronic and magnetic properties
J. E. Fischer、J.M. Bloch、C. C. Shieh 等 5 位作者1985-04-15Physical review. B, Condensed matter
We have determined the frequency-dependent scrE\ensuremath{\rightarrow}\ensuremath{\perp}c\ensuremath{\rightarrow} dielectric function \ensuremath{\epsilon}(\ensuremath{\omega}) for the stage-1 graphite intercalation compounds ${\mathrm{KC}}_{8}$, ${\mathrm{LiC}}_{6}$, and ${\mathrm{KHgC}}_{4}$ in the range 0--40 eV,…
Advancements in Battery MaterialsGraphene research and applicationsSemiconductor materials and devices
Yoshio Sakai、Nobuo Tsuda、Tamio Sakata1985-04-15Journal of the Physical Society of Japan
A Hall coefficient and an electrical conductivity of NbO 2 were measured just below the metal-insulator transition temperature. It is concluded that the conduction is mainly a band conduction of large polarons above 550 K with an energy gap decreasing to zero toward the transition. A reflectivity measurement was consi…
Transition Metal Oxide NanomaterialsCatalysis and Oxidation ReactionsGa2O3 and related materials
Dar-Yuan Song、Robert W. Sprague、Hayley Macleod 等 4 位作者1985-04-15Applied Optics
Silver-based high-reflectance coatings that can withstand the humid and polluted conditions common in the open air have been developed for astronomical telescope optics. The successful designs incorporate a silver reflective layer with a copper underlayer and a stack of dielectric overlayers. Prototypes have been depo…
Adaptive optics and wavefront sensingAdvanced optical system designOptical Coatings and Gratings
T. Ichinokawa、H. Ampo、Satoshi Miura 等 4 位作者1985-04-15Physical review. B, Condensed matter
On clean and Ni-contaminated surfaces of Si(110), experiments of low-energy electron diffraction (LEED) and Auger-electron spectroscopy (AES) were carried out under various heat treatments. The Si(110) clean surface has a ``16\ifmmode\times\else\texttimes\fi{}2'' structure and it transforms reversibly to 1\ifmmode\tim…
Semiconductor materials and devicesElectron and X-Ray Spectroscopy TechniquesSurface and Thin Film Phenomena
F. Bozsó、John T. Yates、W. J. Choyke 等 4 位作者1985-04-15Journal of Applied Physics
The reaction of Si (100) with C2H4 from a molecular beam source has been studied using x-ray photoelectron spectroscopy, electron-energy-loss spectroscopy, and Auger spectroscopy. Using these methods, we have studied the kinetics of SiC formation under conditions where no gas-phase excitation processes can contribute.…
Silicon Carbide Semiconductor TechnologiesSemiconductor materials and devicesElectron and X-Ray Spectroscopy Techniques
Osamu Kubo、T. Ido、H. Yokoyama 等 4 位作者1985-04-15Journal of Applied Physics
Particle size effects on magnetic properties of BaFe12−2xTixCoxO19 fine particles were investigated. Saturation magnetization of these particles decreased with decreasing particle size. This result can be explained with the existence of a nonmagnetic thin layer, several angstroms in thickness, on the surface of the pa…
Magnetic properties of thin filmsMagnetic Properties and Synthesis of FerritesMagnetic Properties of Alloys
N. C. Koon、B. N. Das、Mark Rubinstein 等 4 位作者1985-04-15Journal of Applied Physics
A whole new class of high-performance permanent magnet materials is based on the ternary tetragonal structure R2Fe14B, where R is one of the rare-earth elements. We have successfully grown single crystals of this structure with R=Y, Nd, and Tb. Y is a nonmagnetic rare-earth substitute, while Nd and Tb couple ferro- an…
Magnetic properties of thin filmsRare-earth and actinide compoundsMagnetic Properties of Alloys
D. Givord、H. S. Li、F. Tasset1985-04-15Journal of Applied Physics
Outstanding permanent magnet properties were recently observed in a Nd-Fe-B compound which was shown to crystallize in a new phase, R2Fe14B. Polarized neutron measurements are reported on Y2Fe14B and Nd2Fe14B single crystals. The 3d Fe moment on different sites in Y2Fe14B at 4.2 K is closely related to local environme…
Rare-earth and actinide compoundsHydrogen Storage and MaterialsMagnetic Properties of Alloys
B. W. Veal、A. P. Paulikas1985-04-15Physical review. B, Condensed matter
Photoelectron spectroscopic measurements of core-electron levels in cations of transition-series insulators commonly show ``satellite'' features in the vicinity of the ``main'' photoelectron peaks. In this paper, the relationship between main lines and adjacent satellites is systematically examined for 3d-series insul…
Advanced Chemical Physics StudiesElectron and X-Ray Spectroscopy TechniquesElectronic and Structural Properties of Oxides
Keizo Murata、M. Tokumoto、Hiroyuki Anzai 等 7 位作者1985-04-15Journal of the Physical Society of Japan
We report the superconductivity with the onset temperature as high as 8 K in the organic conductor of β-(BEDT-TTF) 2 I 3 , bis-ethylenedithio otetrathiofulvalene-triiodide. The increased superconducting transition temperature was achieved by an application of a soft pressure, i.e. 1.3 kb. High value of the upper criti…
Magnetism in coordination complexesMolecular Junctions and NanostructuresOrganic and Molecular Conductors Research
M. Okada、Satoru Sugimoto、C. Ishizaka 等 5 位作者1985-04-15Journal of Applied Physics
Present works describe the developments the low cost R-Fe-B sintered permanent magnets. Three different didymiums are chosen for the low cost mixtures of rare-earth elements. The studied alloy compositions are Fe-(32.5–34.5)wt. %R-(1–1.6)wt. %B, where R elements are didymium (Nd-10wt. %Pr), 5Ce-didymium (Nd-15%Pr-5%Ce…
Rare-earth and actinide compoundsHydrogen Storage and MaterialsMagnetic Properties of Alloys
Amit Das、V.S. Ananthan、D. C. Khan1985-04-15Journal of Applied Physics
The variation of lattice parameter, saturation magnetization, and Curie temperature on the addition of Ti4+, Zr4+, and Sn4+ to some Ni-Zn ferrite compositions are reported and the results are explained on the basis of the movement of the substituting ions first to the tetrahedral and finally to the octahedral sites of…
Multiferroics and related materialsMagnetic Properties and Synthesis of FerritesMagneto-Optical Properties and Applications
Timothy R. Oldham1985-04-15Journal of Applied Physics
Measurements of recombination along the tracks of 2-MeV alpha particles and 0.7-MeV protons in thermally grown silicon dioxide are presented. The results agree quite well with the columnar recombination model at applied fields above about 1 MV/cm if one assumes an initial Gaussian column radius b=3.5 nm. The agreement…
Nuclear reactor physics and engineeringSilicon and Solar Cell TechnologiesThermal properties of materials
R. B. van Dover、M. Hong、E. M. Gyorgy 等 5 位作者1985-04-15Journal of Applied Physics
Amorphous Tb-Fe thin films have been produced by dual-gun dc magnetron cosputtering, which allows a moderate range of compositions (spanning about 20 at. %) to be deposited in a single run under identical conditions. The films exhibit clean M-H loops and torque curves which are somewhat anomalous but show consistent t…
Magnetic properties of thin filmsMetallic Glasses and Amorphous AlloysMagnetic Properties and Applications
François Gervais、W. Kress1985-04-15Physical review. B, Condensed matter
The phonon dispersion curves of the rutile-structure compounds ${\mathrm{GeO}}_{2}$, ${\mathrm{SnO}}_{2}$, ${\mathrm{NbO}}_{2}$, and ${\mathrm{VO}}_{2}$ have been calculated in the framework of a shell model which had been used previously to reproduce the measured dispersion curves of rutile (${\mathrm{TiO}}_{2}$) rat…
Gas Sensing Nanomaterials and SensorsMultiferroics and related materialsTransition Metal Oxide Nanomaterials
J. F. Herbst、J. J. Croat、W. B. Yelon1985-04-15Journal of Applied Physics
We describe detailed analyses of neutron powder diffraction data on Nd2Fe14B at several temperatures and discuss relationships between the crystal structure and the magnetic properties via comparison with other rare earth-transition metal systems, Nd2Fe17 in particular. Diffraction studies have also been performed on…
Rare-earth and actinide compoundsHydrogen Storage and MaterialsMagnetic Properties of Alloys
P. M. Chaikin1985-04-15Physical review. B, Condensed matter
A model is presented which gives a unique magnetic-field-induced transition from a two-dimensional open-orbit metal to a semimetal. A magnetic field causes the open-orbit electron motion to become progressively more one dimensional, with an effective density of states proportional to H at low field. This leads to a Fe…
Quantum and electron transport phenomenaMagnetism in coordination complexesOrganic and Molecular Conductors Research