Materials Literature
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The energy dispersion relation of the local interface plasmon modes of two coupled semi-infinite periodic arrays of quantum wells separated by a distance d has been calculated. An exact solution is obtained when the two semi-infinite superlattices have equivalent periodicities and dielectric constants, but different d…
Raman spectra were measured on bulk Na2O⋅(2−x)SiO2⋅xGeO2 glasses, where x varied from 0 to 2, and on Na2O⋅SiO2⋅xGeO2 glasses, where x varied from 0 to 1. Raman spectra were measured also on Na2O⋅(1−x)SiO2⋅xGeO2 glasses crystallized at 650 °C, mostly a solid solution with the β-Na2Si2O5 structure at x between 0 and 1.5…
A previously published analysis of the energy levels of Sm3+ in Y3Al5O12 (YAG) has been extended to include the 4G5/2 multiplet. New absorption and emission data are reported, and some previously reported levels have been reassigned. A theoretical calculation of intensities of emitted radiation originating at the 4G5/…
Hydrogen, deuterium, and helium were implanted at 5 K with energies from 0.25 to 3 keV into thin films of 80–320 nm of gold and tungsten. The annealing of the implantation-induced resistivity was measured during isochronally heating of the specimens up to 400 K. The onset of resistivity annealing after implantation to…
Viewing the brittle-to-ductile transition of fracture in intrinsically brittle solids as a crack tip initiated critical event of either nucleation of dislocation loops from the crack tip or the motion away of such dislocations from the crack tip, experiments have been devised to measure the critical activation energy…
The potassium ions of potassium titanyl phosphate (KTiOPO4, or KTP) are relatively mobile and may be exchanged with other ions from molten salts. Distribution coefficients for potassium, rubidium, barium, and strontium between nitrate melts and titanyl phosphate were measured between 350 and 425 °C. At 425 °C, using m…
The current-voltage (I-V) characteristics of silicon-incorporated polyethylene films fabricated by plasma polymerization have been measured at very high electric fields. The experimental results show that the electric conduction at high fields is due mainly to Fowler–Nordheim type tunneling injection of holes from the…
The adsorption, thermal reactions, and photoreactions of NO on Ag(111) and Cu(111) at 80–85 K have been studied by thermal-desorption spectroscopy (TDS), high-resolution electron-energy-loss spectroscopy (HREELS), and photon-induced desorption. Adsorption of NO on both surfaces is quite complicated. At saturation cove…
The concentration pair correlation function and the order–disorder transition in a diblock copolymer melt are studied in the framework of a self-consistent one-loop approximation. In contrast with earlier work, no simplifying assumption on the wave vector dependence of the correlation functions is made. This allows us…
Resonant tunneling involving discrete quantum states in microcrystalline-Si (\ensuremath{\mu}c-Si) with a-${\mathrm{SiO}}_{2}$ barriers is observed experimentally. The low interface trap densities, and the high barrier height between Si and a-${\mathrm{SiO}}_{2}$, allow the observation of several aspects in the physic…
The vibrational energies of the alkali-metal atoms in graphite intercalation compounds have been analyzed to yield effective temperatures ${\mathrm{T}}_{\mathrm{\ensuremath{\parallel}}}$ and ${\mathrm{T}}_{\mathrm{\ensuremath{\perp}}}$ and the corresponding Debye temperatures ${\mathrm{\ensuremath{\Theta}}}_{\mathrm{\…
We have studied reactive ion etching of Si1−xGex alloys with x≤0.15 and Ge in HBr plasmas. The etch rate of SiGe increases monotonically with the Ge content of the alloy and for a Si85Ge15 alloy was ≂50% greater than for Si. Etch profiles are identical to those formed in singe-crystal Si. X-ray photoelectron spectrosc…
We report measurements of the thermoelectric power and conductivity of ‘‘new’’ polyacetylene doped with iodine. In highly doped samples in which the conductivity extrapolates to finite values at zero temperature, we observe a nonlinearity in the thermopower very similar to that characteristic of the electron–phonon ef…
Room temperature, time-of-flight, powder neutron diffraction measurements on cupric oxide, CuO, at ambient and 22(1) kbar hydrostatic pressure have provided the pressure dependence of the monoclinic lattice parameters and the single positional parameter, namely the y parameter of oxygen. The percentage changes in the…
The optical absorption spectrum (2 eV∼6.8 eV), the Ce 3+ emission spectrum (1.8 eV∼2.7 eV) and the excitation spectrum for the 550 nm Ce 3+ emission (2.4 eV∼6.3 eV) have been measured on single crystals of YAG:Ce 3+ . The excitation spectrum for the 550 nm emission (2.7 eV∼11.2 eV) is also reported on powder phosphor…
Geometries and electronic structures of the B12 cluster have been investigated using a Car–Parrinello ab initio molecular dynamics simulation. The icosahedral structure, which is commonly found in bulk boron compounds, is locally stable, but has a few dangling bonds. On melting and annealing, this structure rearranges…
Porous silicon/silicon structures under anodic oxidation conditions give rise to an electroluminescence phenomenon in the visible range. Using an optical multichannel analyzer the spectral distribution of the emitted light was measured−in situ−during the anodic oxidation step. Recorded spectra show a maximum which shi…
We have measured the carbon K near-edge x-ray-absorption fine structure of graphite by transmission, electron yield, and fluorescence yield. A rounded and prominent peak is identified in the near-edge spectrum, among the other well-known spectral features. With the aid of a full-potential linearized augmented-plane-wa…
Surfaces of yttria, zirconia, and yttria-stabilized zirconia were studied using x-ray photoelectron spectroscopy. An almost threefold increase in the surface yttrium concentration was observed in the yttria-stabilized zirconia samples. The core level binding energies of yttrium, zirconium, and oxygen ions in yttria-st…
The electronic structure of MnO has been investigated using high-energy (x-ray photoelectron and bremsstrahlung-isochromat) spectroscopies. An experimental gap of 3.9 eV is found. By comparing the experimental results to a configuration-interaction cluster model, values for the different parameters in a model Hamilton…