Materials Literature
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We analyze optical-absorption and Raman-scattering measurements of CdS- and Zn-doped borosilicate glass, heat treated at 600 \ifmmode^\circ\else\textdegree\fi{}C to 725 \ifmmode^\circ\else\textdegree\fi{}C, to study the nucleation and growth of II-VI nanoparticles. The energy of vibrational Raman modes indicates that…
The thermopower η of Sr1−xLaxTiO3 ceramics was investigated up to x=0.5 and in the temperature range between 150 K and 1200 K. In addition, the carrier concentration n was determined by Hall measurements and by a chemical Ti3+-analysis. For low temperatures and high n, η depends linearly on temperature and on n−2/3, a…
The ab initio pseudopotential method within the local-density approximation and the quasiparticle approach have been used to investigate the electronic excitation properties of hexagonal (6H, 4H, 2H) and zinc-blende (3C) silicon carbide. The quasiparticle shifts added to the density-functional eigenvalues are calculat…
The laser-induced crystallization behavior of GeTe-based amorphous alloys has been measured with a novel multipulse laser technique. This enables the composition dependence of the nucleation rate and crystal growth speed to be independently followed. Two types of crystallization are investigated. The first involves si…
The notion and usefulness of the effective dielectric constant in silicon nanocrystallites are analyzed using a self-consistent linear screening calculation of hydrogenic impurities. It is shown that the self-consistent screened potential induced by the defects can be reasonably approximated by the classical electrost…
The 2\ifmmode\times\else\texttimes\fi{}1/1\ifmmode\times\else\texttimes\fi{}2 surface reconstruction of a homoepitaxial diamond (001) surface has been examined using a scanning tunneling microscope at an atomic scale and reflection electron microscopy at a macroscopic scale. The monohydride dimer, which is a unit of t…
We apply a previously reported density-functional-based scheme for the construction of common nonorthogonal tight-binding (TB) matrix elements for Si and SiH within the framework of the linear combination of atomic orbitals formalism using the local-density approximation. By only considering two-center integrals the H…
Transient and persistent holographic gratings have been observed in dye- and fullerene C(60)-doped nematic liquid-crystal films. The nature and time evolution of the underlying mechanisms, such as space-charge field production, flows, and dielectric- and conductivity-induced torques, and the resultant director axis re…
Research Article| October 15 1995 Structure and function of the aromatic amino acid hydroxylases S E Hufton; S E Hufton 1Olive Miller Protein Chemistry Laboratory, Murdoch Institute, Royal Children′s Hospital, Parkville, Victoria 3052, Australia Search for other works by this author on: This Site PubMed Google Scholar…
Magnetotransport properties were investigated for a crystal of perovskite-type manganese oxide, Pr 1- x Ca x MnO 3 ( x =0.3). The single-crystal compound is insulating and below 220 K shows the charge-ordering of Mn 3+ and Mn 4+ species. Application of a magnetic field (>20 kOe) changes a canted antiferromagnetic insu…
We have recently reported that bound electron-hole pairs (Mott-Wannier excitons) are the dominant source of photoelectron emission from specially prepared [``as-polished'' C(111)-(1\ifmmode\times\else\texttimes\fi{}1):H] negative-electron-affinity diamond surfaces for near-band-gap excitation up to 0.5 eV above thresh…
The observed reactivity of MgO with water is in apparent conflict with theoretical calculations which show that molecular dissociation does not occur on a perfect (001) surface. We have performed ab initio total-energy calculations which show that a chemisorption reaction involving a reconstruction to form a (111) hyd…
The laser-induced crystallization behavior of GeTe-based amorphous alloy thin films has been quantitatively studied by local reflection measurements with a focused 780 nm laser. The use of multiple laser pulse sequences enables the nucleation rate and crystal-growth speed to be separately deduced, allowing the composi…
The degradation (fatigue) of dielectric properties of ferroelectric Pb(ZrxTi1−x)O3 (PZT) and SrBi2Ta2O9 thin films during cycling was investigated. PZT and SrBi2Ta2O9 thin films were fabricated by metalorganic decomposition and pulsed laser deposition, respectively. Samples with electrodes of platinum (Pt) and rutheni…
The incorporation of metal clusters into thin organic dye layers as a method for producing strongly absorbing composite layers: an oscillator model approach to resonant metal cluster absorption, O Stenzel, S Wilbrandt, A Stendal, U Beckers, K Voigtsberger, C von Borczyskowski
The thermal stability of five structurally distinctive silicone polymers and the silicone pressure-sensitive adhesives derived therefrom were investigated over a wide temperature range. Thermogravimetric analyses and isothermal weight loss studies showed that the thermal stability of these polymers ranked as follows:…
In this chapter we present an overview of the high-temperature properties and applications of polymers and polymer composites. Included are discussions of heat transfer in polymer-based materials, their physical and mechanical properties at elevated temperatures, chemical and physical aging of polymers and effects of…
In this chapter we present an overview of the high-temperature properties and applications of polymers and polymer composites. Included are discussions of heat transfer in polymer-based materials, their physical and mechanical properties at elevated temperatures, chemical and physical aging of polymers and effects of…
Present and future information technology requires ever faster data transmission rates, but conventional circuitry has serious limitations. In his Perspective, Walba describes a new generation of electrooptical devices based on liquid crystals. These ‘spatial light modulators’ can be integrated with silicon circuits t…
The pressure dependence of the Born effective charge, dielectric constant and zone-center LO and TO phonons have been determined for $3C$-SiC by a linear response method based on the linearized augmented plane wave calculations within the local density approximation. The Born effective charges are found to increase ne…