Materials Literature
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Subjecting natural diamond single crystals to the action of atomic hydrogen in a hydrogen plasma is shown to result in the passivation of interband states in the crystal resulting in a marked reduction in the resistivity to about 105 Ω cm from the expected high resistivity of∼1016 Ω cm. When the hydrogenated crystals…
We have implanted boron ions into insulating natural diamonds which were predamaged by carbon ion implantation in order to enhance the doping efficiency. All implantations were performed at liquid-nitrogen temperature. Subsequent rapid thermal annealing at 1100 °C produced strong new optical absorption bands near 1060…
Sharp structure between 2.60 and 2.64 eV observed in the cathodoluminescence spectra of synthetic diamond, following radiation damage and annealing at 300 degrees C, has been identified as a series of local-mode phonon replicas of the zero-phonon line at 2.807 eV. By examining the isotope shifts of these replicas in d…
Abstract The magnetic moment at 0 K of zinc‐substituted lithium ferrite is calculated, based on the spin‐canting model, for an accurate relationship between the moment and the substituent level of zinc. A modified computational plan is adopted in the calculation in contrast with those of recent publications so that a…
X-ray diffraction patterns of amorphous-polymer LB films were investigated in detail, and weak peaks at low 2θ angles were found to correspond to the film thickness. The diffractions are considered to be the results of Fourier transformation of two component systems: one at the interface of air and amorphous film, and…
Article A Thermodynamic Assessment of the Sb-Te System / Eine thermodynamische Optimierung des Systems Sb-Te was published on October 1, 1989 in the journal International Journal of Materials Research (volume 80, issue 10).
Abstract Field and mineralogical studies, supplemented by chemical analyses of charnockite and its derivative gneisses from one of the quarries between Ramalingapuram and Seshanchavadi along Attur valley have revealed retrogression of charnockite to biotite gneiss and onto ankerite-dolomite-bearing gneiss, involving a…
Equations are derived for the effects of x-ray birefringence at a molecular scale on the intensity of scattering by isotropic amorphous materials. These effects introduce false detail into radial distribution functions calculated by the usual Fourier transformation. They may compromise multiple-wavelength techniques f…
Actinoplanes missouriensis utilizes arogenate as an intermediate in L-tyrosine biosynthesis, while no evidence of prephenate dehydrogenase was observed. Arogenate dehydrogenase has been partially purified by a five-step procedure. The enzyme requires NAD as cofactor. The Km values for NAD and arogenate are 0.2 mM and…
Abstract Macroporous hydro‐ and xero‐gels of bead cellulose, prepared by thermal coagulation of cellulose xanthate after emulsification in an organic liquid immiscible with water, and subsequent decomposition to cellulose II have been modified by crosslinking with epichlorohydrin during the process of preparation as w…
Abstract New resonance Raman scattering (RRS) sequences of vibrational overtone lines of Se 2 − SeS − , S 3 − and Se 3 − have been observed. By a photochemical technique these centres and S 2 − can now be produced in alkali metal bromides and chlorides. Vibrational frequencies from RRS or Raman scattering (in the case…
Abstract The nature and extent of hydrazine adsorption by clays and soils was found to be highly dependent on the suspension pH and on the types of surface functional groups. Under acidic conditions, replacement of Na + by N 2 H + 5 was the primary mechanism for hydrazine retention by every system studied. Most of the…
Cu- and Zn-containing compounds are characterised making use of the Wagner Auger parameter and of the so-called chemical state plots to obtain information on the relative initial-state charge distributions and on the relative extra-atomic relaxation energy. The position in the plots of different classes of compounds i…
Cotton yarn (40 Ne) was sized at squeeze pressures of 22 and 33.8 daN/cm 2 (cor responding to 5 and 25 daN/cm) on a laboratory sizing machine. The weaving per formance of yam sized at the high pressure was better than the yarn sized at the low pressure. This improvement is attributed to increased size penetration, gre…
The special features of synchrotron X-radiation and the types of instrumentation required for a range of synchrotron X-ray diffraction experiments are outlined. A diverse range of applications to inorganic and heterogeneous catalyst systems are discussed. Grazing incidence X-ray diffraction experiments have revealed a…
Clay complexes with surface‐grown nickel(II) basic salts were produced from nickel(II) nitrate solutions containing dispersed layer silicate by homogeneous precipitation using hydrolysis of urea. These clay—nickel(II) salt complexes were obtained with clay having cation‐exchange properties; in contrast, using clay wit…
The ratio d${\ensuremath{\sigma}}_{K}$(\ensuremath{\theta})/d${\ensuremath{\sigma}}_{\mathrm{free}(\mathrm{\ensuremath{\theta}}}$) of the differential cross sections for Compton scattering by K-shell electrons of lead to Compton scattering by free electrons has been measured for an incident photon energy of 662 keV an…
A new type of cation-compensated ${\mathrm{Fe}}^{3+}$ (S=(5/2) center designated [${\mathrm{FeO}}_{4}$/M${]}_{\mathrm{\ensuremath{\beta}}}^{0}$, with M=Li and H, has been found to exist in synthetic iron-doped \ensuremath{\alpha}-quartz, through an X-band electron paramagnetic resonance study. The spin-Hamiltonian par…
Abstract This paper focuses on the problem of scale‐up of two‐phase (e.g., solid‐fluid) reactors. It outlines a class of such reactors which, for first‐order reactions, scale in the familiar single‐phase manner via an analog of the usual residence time distribution formula. The differences lie in the fact that the app…
The dielectric relaxation time τ of KH2PO4 and CsH2AsO4 was investigated in the ferroelectric phase through measurements of the complex dielectric constants in the frequency range between 103 Hz and 109 Hz. Anomalous increase in τ near the domain freezing temperature Tf , considered together with the relation between…