Materials Literature
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Phytoplankton the passively floating or weakly swimming plant life found in bodies of water is generally inconspicuous. It is of basic importance in lakes and seas, however, as the primary producer of the organic material on which other forms of aquatic life depend; and it is probable that its total photosynthetic out…
Abstract A new method of obtaining the kinetic parameters from thermogravimetric curves has been proposed. The method is simple and applicable to reactions which can not be analyzed by other methods. The effect of the heating rate on thermogravimetric curves has been elucidated, and the master curve of the experimenta…
Abstract Die durch Bestrahlung mit Elektronen von 40 bis 80 kV hervorgerufenen Änderungen der Gitterstruktur von Polyäthylen(PÄ)‐ und Polyoxymethylen(POM)‐Einkristallen wurden unterrsucht. Dazu wurden Lage, Intensität und Linienbreite der Reflexe im Elektronenbeugungsdiagramm in Abhängigkeit von der Bestrahlungsdosis…
Abstract The kinetics of the crystallization of isotactic polybutene‐1 from the melt and of the transformation of modification 2 to modification 1 are studied by dilatometric measurements. The isotherms of the polymorphous solid‐solid transformation show substantially the same features as those of crystallization. Con…
Abstract The crystallographic characteristics of deformation twinning are derived by considering the atomic movements which occur at the moving interface as a twin propagates. This is facilitated by making use of the notation of the tensor calculus, and general expressions, valid for all crystal structures, are obtain…
The normal-incidence reflection spectrum of cubic CdS has been measured for photon energies between 2 and 22 eV. The samples were prepared by epitaxial deposition on the {1\ifmmode\bar\else\textasciimacron\fi{}11} "As face" of GaAs. The lowest direct absorption edge produces a reflection peak at 2.50 eV at room temper…
Electron transport in thermally grown layers of Si${\mathrm{O}}_{2}$ has been studied. Electrons are introduce into the oxide by photoemission from the adjoining silicon crystal. Specimens consist of a silicon crystal covered with an Si${\mathrm{O}}_{2}$ layer about 2 microns thick and, over this, a semitransparent go…
The normal-incidence reflectance spectra of SrTi${\mathrm{O}}_{3}$ and BaTi${\mathrm{O}}_{3}$ and the optical constants derived by the Kramers-Kronig method are reported. These spectra are very similar to those of rutile. The strongest optical transitions ($A$) occur at about 4.4 eV: They are responsible for the dispe…
The infrared spectra of the anhydrous rare-earth nitrates are presented in the region 4000–100 cm−1. Strong coordination of the nitrate groups to the metal atom occurs. Possible different types of metal—oxygen bonding in these compounds is discussed.
Infrared-active lattice vibrational spectra of α-Al2O3 and Cr2O3 have been investigated by reflection and transmission measurements on single crystal samples and also by transmission on Nujol mulled Cr2O3. Single-crystal transmission data above 700 cm−1 have been assigned to combinations and overtones.
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 E. H. Nicollian, A. Goetzberger; MOS CONDUCTANCE TECHNIQUE FOR MEASURING SURFACE STATE PARAMETERS…
Received 16 September 1965DOI:https://doi.org/10.1103/PhysRevLett.15.621©1965 American Physical Society
The transport properties of electrons in CdS grown with Group I impurities which show the phenomenon of "storage" have been studied to determine the mechanism of conduction. The mobility parallel to the $c$ axis at low temperature is of the order of 1 to 10 ${\mathrm{cm}}^{2}$/ volt sec and is very anisotropic, the mo…
Nuclear magnetic double-resonance experiments were performed on a gaseous sample containing a mixture of HD and C${\mathrm{O}}_{2}$ at high pressure by observing the spin-spin multiplet in the proton-resonance spectrum and irradiating either the deuteron transitions or some of the proton transitions. The spectra show…
The Hall coefficient and electrical resistivity have been measured on single-crystal specimens of $n$-type Sn${\mathrm{O}}_{2}$ between 80 and 900\ifmmode^\circ\else\textdegree\fi{}K. Data were obtained on samples in the "as grown" state, as well as on crystals which were thermally equilibrated in oxygen. A single-don…
Using symmetry arguments, the effective-mass Hamiltonian including spin-orbit interaction is derived for energy bands with extrema near the vertical edge of the hexagonal prism which represents the Brillouin zone of graphite. The energy bands in the plane normal to the vertical edge are described by k\ifmmode\cdot\els…
The edge-recombination-radiation spectrum from natural semiconducting diamond has been re-examined and compared with spectra obtained for the first time from aluminum and nominally boron-doped General Electric synthetic diamond. The intrinsic components are due to the phonon-assisted decay of free indirect excitons of…
Optical absorption and photoconductivity have been observed in the ultraviolet in single crystals of nominally pure $\ensuremath{\beta}\ensuremath{-}{\mathrm{Ga}}_{2}{\mathrm{O}}_{3}$. At room temperature a steep absorption edge, characteristic of a band-to-band transition, is observed at 2700 \AA{}. The edge is shift…
Experience with stainless-steel-clad fuel rods irradiated in the Vallecitos Boiling Water Reactor (VBWR) has shown that Type-304 stainless steel is susceptible to stress-assisted intergranular corrosion attack. Failure of over 40 fuel rods clad with this material occurred during irradiation of 950 fuel rods of several…
The relation between the grain size, the density and the sintering conditions for polycrystalline nickel ferrite has been studied for specimens prepared by a conventional ceramic technique. The contribution to the ferrimagnetic resonance linewidth due to the pores within the ferrite is considered and it is shown that…