Materials Literature
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A method for solution of the Cahn–Hilliard equation is presented. Unlike previous work, the discrete equations for the new method possess a Lyapunov function. This makes it possible to prove convergence of the approximate solutions without assumptions beyond those necessary for existence and uniqueness of the differen…
The present paper reviews the results of experimental investigations of the photodoping of amorphous chalcogenides by metals, and in particular by silver. The kinetics of the photodissolution of the metal are described as also is the influence on the photodissolution rate of such factors as the wavelength and intensit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoisture absorption characteristics of organosiloxane self-assembled monolayersDavid L. Angst and Gary W. SimmonsCite this: Langmuir 1991, 7, 10, 2236–2242Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published inissue 1 October 1991ht…
Phase separation which occurs in parallel to the hydrolysis and gelation of alkoxysilane solution containing poly(sodium styrenesulfonate) (NaPSS) has been investigated. Depending on the reaction conditions, gel morphologies such as isolated pores, particle aggregates, and interconnected continuous pores from 0.1 to 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Raman scattering of self-assembled monolayers formed from 1-alkanethiols: behavior of films at gold and comparison to films at silverMark A. Bryant and Jeanne E. PembertonCite this: J. Am. Chem. Soc. 1991, 113, 22, 8284–8293Publication Date (Print):October 1, 1991Pub…
Based on density measurements, X-ray diffraction analysis, and high-resolution trans-mission electron microscopy of a suite of natural zircon samples from Sri Lanka (0.06 xl0r5 to 6.3 x l0rs a-decay events/mg), three stages of damage accumulation may bedelineated. Stage I ( 8 x 10'5 a-decayevents/mg) consists of mater…
A new method for combined finite-element and atomistic analysis of crystal defects has been developed. The coupling between the atomistic core and the surrounding continuum is described in terms of non-local elasticity theory. Static and dynamic tests demonstrate the satisfactory performance of this method. The model…
Mullite (3Al 2 O 3 ·2SiO 2 ) is becoming increasingly important in electronic, optical, and high‐temperature structural applications. This paper reviews the current state of mullite‐related research at a fundamental level, within the framework of phase equilibria, crystal structure, synthesis, processing, and properti…
The Kohlrausch-Williams-Watts (KWW) and the Havriliak-Negami (HN) relaxation functions have been widely used to describe the relaxation behavior of glass-forming liquids and complex systems. While the HN relaxation function is a frequency function, the natural domain of the KWW relaxation function is time (although it…
Collagen molecules are structural macro-molecules of the extracellular matrix that include in their structure one or several domains that have a characteristic triple helical conformation. They have been classified by types that define distinct sets of polypeptide chains that can form homo- and heterotrimeric assembli…
Magnetic materials research has entered a new and exciting period with the advent of the ternary rare-earth-iron-boron compounds, ${\mathrm{R}}_{2}$${\mathrm{Fe}}_{14}$B. From the fundamental physics perspective the ${\mathrm{R}}_{2}$${\mathrm{Fe}}_{14}$B series and its isostructural relatives comprise a rich, fascina…
The formation and conversions of gem-polyols have been examined together with their chemical and physical properties. The bibliography includes 123 references.
The oxide desorption processes of InP have been investigated under molecular-beam epitaxy conditions, determining thickness and composition of the surface layer by x-ray photoelectron spectroscopy and surface reconstructions by reflection high-energy electron diffraction (RHEED). Under P2 stabilization the oxide desor…
A synergistic high-resolution electron microscopy (HREM) and theoretical analysis of the structure of a grain boundary in copper containing bismuth is presented. The calculation of the structure of the boundary were carried out using N-body empirical potentials constructed using results of ab initio full-potential lin…
Using a variational argument, we show that a two-dimensional (2D) crystal becomes defective in the presence of a random potential. The threshold pinning force and flow properties of a plastically deformed crystal are studied using a perturbation theory valid for weak pinning potential and strong driving force. In the…
Processes are examined which involve the growth of film layers with dielectric properties on the surfaces of semiconductors during thermo-oxidation in the presence of impurity compounds specially introduced into the system. It is shown in relation to the thermo-oxidation of silicon and gallium arsenide that impurities…
The composition dependence and room-temperature metastability of the paramagnetic nitrogen dangling-bond center is amorphous silicon nitride suggest that its energy level lies close to the N pπ states, in agreement with theoretical calculations.
The authors develop a new efficient method for calculating the shape-truncation functions of arbitrary Voronoi polyhedra by combining analytical and numerical techniques. Applications are presented for cells of cubic symmetry as well as for hexagonal close-packed (HCP) atomic polyhedra with different values of the c/a…
The growth by pulsed-laser deposition of c-axis-oriented bismuth titanate (BTO)/YBa2Cu3O7(YBCO) superconductor heterostructures on [001]-oriented Si with epitaxial yttria-stabilized ZrO2 as a buffer layer is reported. X-ray-diffraction studies of the heterostructures show that all the layers grow in the c-axis orienta…
Reasons why chelates of rare earths (RE) do not obey the tetrad 'doublet' effect are discussed. The examination is based on the concept of an ionic metal–ligand bond in RE complexes. The mutual influence of ligands in lower, higher, polynuclear and mixed complexes formed by ligands of low, medium and high denticity is…