Materials Literature
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Charge ordering occurs in some mixed-valent transition metal oxides. The perovskite manganates of the formula Ln 1 - x A x MnO 3 (Ln = rare earth; A = Ca, Sr) are especially interesting because long-range ordering of the Mn 3+ ( ) and Mn 4+ ( ) ions in these materials is linked to antiferromagnetic spin ordering, and…
Charge-lattice fluctuations are observed in the layered perovskite manganite ${\mathrm{LaSr}}_{2}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ by Raman spectroscopy at temperatures as high as 340 K, and with decreasing temperature they become static, forming a charge-ordered (CO) phase below ${T}_{\mathrm{CO}}=210\mathrm{K}.$ In…
We study the dynamics and morphology of grain growth with anisotropic energy and mobility of grain boundaries using a generalized phase-field model. In contrast to previous studies, both inclination and misorientation of the boundaries are considered. The model is first validated against exact analytical solutions for…
Roles of orbital degree of freedom of Mn ions in phase transition as functions of temperature and hole concentration in perovskite manganites are studied. It is shown that the orbital order-disorder transition is of the first order in the wide region of hole concentration, and the N\'eel temperature for the anisotropi…
We have developed a dynamical model for the dielectric response in relaxor ferroelectrics that explicitly takes into account the coexistence of the critical slowing down and glassy freezing. The application of the model to the experiment in ${\mathrm{PbMg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}$ (PMN) allowed for t…
The electronic structure of ${\mathrm{SrBi}}_{2}{\mathrm{Ta}}_{2}{\mathrm{O}}_{9}$ is investigated from first-principles, within the local-density approximation, using the full-potential linearized augmented plane-wave method. The results show that, besides the large $\mathrm{Ta}(5d)\ensuremath{-}\mathrm{O}(2p)$ hybri…
Intergranular (IG) attack regions and stress corrosion cracks in Alloy 600 (UNS N06600) U-bend samples tested in 330°C pressurized water reactor water were characterized by analytical transmission electron microscopy (ATEM). Observations of cross-sectioned samples revealed short, oxidized zones preceding crack tips an…
The objective of this work is to improve measurements of transport properties using the hot disk thermal constants analyzer. The principle of this method is based on the transient heating of a plane double spiral sandwiched between two pieces of the investigated material. From the temperature increase of the heat sour…
Yttrium silicate (Y 2 SiO 5 ) coatings complement SiC coatings for protecting ceramic multilayer composite materials based on carbon‐fiber‐reinforced SiC composites (C‐SiC). Thick (100 μm), dense Y 2 SiO 5 coatings were prepared by dip coating, using concentrated aqueous slips. The resulting phases were studied by tak…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTGiant Vesicle Formation through Self-Assembly of Complementary Random CopolymersFaysal Ilhan, Trent H. Galow, Mark Gray, Gilles Clavier, and Vincent M. RotelloView Author Information Department of Chemistry, University of Massachusetts Amherst, Massachusetts 01003 Cite…
RIKEN beamline I (BL45XU) is an undulator beamline with two branches. One is for protein crystallography (PX) and the other is for small-angle x-ray scattering (SAXS). The beam is split into the two branches by a diamond monochromator so that two experiments can be done simultaneously [Yamamoto et al . (1995) Rev. Sci…
We examine the dynamics of hard spheres and disks at high packing fractions in two and three dimensions, modeling the simplest systems exhibiting a glass transition. As it is well known, cooperativity and dynamic heterogeneity arise as central features when approaching the glass transition from the liquid phase, so an…
Porphyrins and metalloporphyrins provide an extremely versatile nanometer-sized building block for the control of materials properties. Films, solids and microporous solids have been explored as field-responsive materials (i.e. interactions with applied electric, magnetic or electromagnetic fields) and as ‘chemo-respo…
under limitation by silicon, nitrogen, or phosphorus. Cell sizes for nutrient-limited cultures were significantly smaller than the non-limited cell sizes, with N-limited cells being significantly smaller than all other treatments. Compared with the nutrient-replete treatment, both carbohydrates and lipids increased in…
Solid-state devices in which electrons are confined to two-dimensional planes have provided some of the most exciting scientific and technological breakthroughs of the last 50 years. From metal-oxide-silicon field effect transistors to high-mobility gallium-arsenide heterostructures, these devices have played a key ro…
Measurement of dc charging current and space-charge observations, performed on specimens made by low-density polyethylene (PE) and crosslinked PE, are considered for dc electrical threshold investigation. The threshold is inferred from charging-current measurements through steady-state voltage-current characteristics,…
The structure of the tetragonal phase of the A-site-substituted perovskite sodium bismuth titanate, Na(0.5)Bi(0.5)TiO3, has been determined by neutron powder diffraction at 698 K. The structure was refined in space group P4bm with a (= b) = 5.5191 (1), c = 3.9085 (1) A, V= 119.055 (5) A3, Z = 2 and Dx = 5.91 Mg m(-3).…
Tridentate Schiff-base carboxylate-containing ligands, derived from the condensation of 2-imidazolecarboxaldehyde with the amino acids beta-alanine (H2L1) and 2-aminobenzoic acid (H2L5) and the condensation of 2-pyridinecarboxaldehyde with beta-alanine (HL2), D,L-3-aminobutyric acid (HL3), and 4-aminobutyric acid (HL4…
Edible films were developed using different starch sources (corn starch and amylomaize). Starch suspensions were cold gelatinized with NaOH; either glycerol or sorbitol were used as plasticizer. Films were characterized by Differential Scanning Calorimetry (DSC), X-ray diffraction, Scanning Electron Microscopy (SEM) a…
The equation of state of anatase ${\mathrm{TiO}}_{2}$ has been determined experimentally---using polycrystalline as well as single-crystal material---and compared with theoretical calculations using the ab initio perturbed ion model. The results are highly consistent, the zero-pressure bulk modulus being 179(2) GPa fr…