Materials Literature
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Co 2+ enters the lattice of zirconia stabilized with a 46% of yttria in fourfold coordinated cation sites. The absorption spectrum consists mainly of two triplets, one of which is rather weak at around 5500 cm -1 (corresponding to the 4 A 2 to 4 T 1 ( 4 F) transition), while the other is very intense at around 15175 c…
Sintering characteristics of Sm2Fe17Nx were studied under high-pressure conditions (pressure=3 GPa and temperatures=300, 550, and 800 °C) without any binding material. High-pressure treatments at 3 GPa and 550 °C succeeded in preparing the sintered materials without any decomposition, which possessed density values cl…
The use of heteropolycompounds (heteropolyacids and their salts) as acid and oxidation catalysts of fine organic synthesis reactions is examined. The use of the heteropolycompounds in the synthesis of antioxidants, medicinal preparations, vitamins and other products produced on a small scale is discussed. Examples of…
A metal-semiconductor-metal (MSM) photoconductor and a p-n photodiode have been fabricated from rapid-thermal-oxidized (RTO) porous Si. The MSM photoconductor achieved 2.8×higher responsivity at 350 nm than a UV-enhanced Si photodiode, and the RTO photodiode exhibited an external quantum efficiency of 75% at 740 nm.
Yttria-stabilized cubic zirconia has been studied at 300 K by use of Raman spectroscopy under uniaxial stress along the [001] and [111] directions. The main effects observed are the frequency shifts of the F2g-type Raman band at ∼610 cm−1 which vary linearly with the applied stress and tend to increase with Y2O3 conce…
A set of extra peaks, which dominate the region of the silver s-p band, are observed in angle-resolved photoemission from Ag islands formed on GaAs(110) by low temperature deposition and annealing to room temperature. The thickness dependence of peak spacing demonstrates that the new peaks originate from wave vector q…
Samples of nanocrystalline Ge embedded in SiO2 that display visible photoluminescence were synthesized from chemical vapor deposition-grown Si0.6Ge0.4 in a two step process of hydrothermal oxidation using steam at 25 MPa and 475 °C followed by annealing at 750 °C in flowing forming gas (80/20:N2/H2). A broad photolumi…
Inelastic scattering of electrons in solids is computed from a generalized oscillator strength model based on optical and photoelectric data. The optical oscillator strength is extended into the non-zero momentum transfer region by using free-electron gas dispersion for the weakly bound electrons. The applicability of…
A process for forming porous SiC from single-crystal SiC wafers has been demonstrated. Porous SiC can be fabricated by anodizing n-type 6H-SiC in HF under UV illumination. Transmission electron microscopy reveals pores of sizes 10–30 nm with interpore spacings ranging from ≊5 to 150 nm. This is the first reported dire…
By measuring the complex dielectric function over 15 decades in frequency we evaluate the scaling of the \ensuremath{\alpha}-relaxation for several glass-forming liquids including propylene carbonate. The temperature dependence of the mean relaxation time and of the relaxation strength of the relaxation function displ…
We have observed a new type of magnetic linear dichroism in angle-resolved, spin-integrated photoemission: For p-polarized light under oblique incidence the Fe 3p core level peak position and line shape change when the sample magnetization is reversed. Spin-resolved measurements show that the effect is due to spin-orb…
The motion of the bubble radius and of the air trapped inside the bubble during sonoluminescence are determined self-consistently by coupling the solution of the Rayleigh-Plesset equation governing the bubble radius to the solution of Euler's equations for the motion of air in the bubble. Results are presented for thr…
Abstract The experimentally measured angular distribution of electrons elastically backscattered from polycrystalline or amorphous solids exhibts a strong resemblance to the differential cross‐section for single‐atom elastic scattering. Consequently most analytical attempts to describe the problem, which involve some…
Abstract A combined Auger, EDX and SEM surface imaging study of the initial stages of pitting corrosion is presented. Examples of different pitting initiation situations are shown and the importance of multi‐technique imaging to interpret the results is demonstrated. The information provided by the images is compared…
Abstract X‐ray photoelectron spectroscopy of cerium oxides is discussed. The well‐resolved 3d 3/2 (5d 6s) 0 4f 0 2p 6 peak at 916.70 eV cannot be used for calculating the amount of reduction because the correlation between its intensity and the concentration of Ce(IV) and CE(III) species is not liner. We have therefor…
The guided-mode resonance characteristics of planar dielectric waveguide gratings with arbitrary grating slant are discussed. These all-dielectric structures can operate as high- efficiency, narrow-line reflective filters. Expressions and graphs defining the resonance regimes and the resonance locations and their sepa…
Advances in the deposition process have led to dramatic improvements in the electronic properties of polycrystalline diamond films produced by chemical vapor deposition (CVD). It is now possible to produce CVD diamond with properties approaching those of IIa natural diamonds. The combined electron-hole mobility, as me…
ABSTRACT Producing well water samples from the Prudhoe Bay Eastern Operating Area were evaluated with respect to the fraction of seawater in the sample. The evaluation demonstrated that the previous method of using magnesium or sulfate to determine percent seawater was in error. Because the water contains acetic acid,…
Abstract A main theme of this book is the behaviour of the conductivity of metals and semiconductors when the mean free path k is of order a, the distance between atoms or scattering centres. In this case the assumption of single scattering on which the Boltzmann formula (eqn (1.4)) is based breaks down. One way of tr…
A microscopic model is used to discuss the long-range ordering behaviour of the oxygen vacancies in mullite. This aluminosilicate of composition Al 2 (Al 2+2x Si 2-2x )O 10-x (vacancy) x presents an extremely stable incommensurate modulated structure with a wave vector Q Ic (x) which depends on the composition index x…