Materials Literature
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Many studies have been performed on aging of lead zirconate titanate (PZT), but a single model has not been universally accepted. An aim of this research was to determine whether harmonic analysis could distinguish among the models for the aging of PZTs. Doped and undoped PZT samples were prepared, and the aging behav…
Abstract ε‐Caprolactone and glycolide were copolymerized in bulk either with tin(II) 2‐ethylhexanoate (SnOct 2 ) or with bismuth(III) n ‐hexanoate (BiHex 3 ) as initiators and with tetra(ethylene glycol) as a coinitiator. The temperature was varied from 100 to 160 °C. The sequences were characterized with 1 H and 13 C…
Novel nickel catalyst deposited on nanoporous carbon was found to be an efficient catalyst for the epoxidation of simple alkenes with <TEX>$O_2$</TEX> and isobutyraldehyde under mild conditions. Alkenes exhibited different reactivities towards Ni-catalyst and epoxidation with stilbene proceeds stereospecifically. This…
Due to its coefficient of thermal expansion (CTE) and phase stability up to 1360°C, tantalum oxide (Ta 2 O 5 ) was identified and investigated as a candidate environmental barrier coating for silicon nitride‐based ceramics. Ta 2 O 5 coatings were plasma sprayed onto AS800, a silicon nitride ceramic from Honeywell Inte…
The demonstration and confirmation of metamaterials with simultaneous negative permittivity and permeability, and thus a negative refractive index, has resulted in a surge of interest in the reflection and refraction phenomena at the interfaces of these so-called negative-index materials (NIMs). We present a systemati…
(Ba 0.6 ,Sr 0.4 )TiO 3 (BST) films were deposited on copper foils by radio frequency magnetron sputtering. By the use of controlled p O 2 high‐temperature anneals, the films were completely crystallized in the absence of substrate oxidation. X‐ray diffraction and transmission electron microscopy (TEM) revealed an abru…
Ultrafine tin oxide (SnO 2 ) fibers having a rutile structure, with diameter ranging from 100 nm to several micrometers, were synthesized using electrospinning and metallorganic decomposition techniques. In this work, we propose a precursor solution that is a mixture of pure SnO 2 sol made from SnCl 4 :H 2 O:C 3 H 7 O…
High‐resolution X‐ray scanning diffractometry has been used to study the residual strain in Si 3 N 4 /Ni diffusion bonds. Bonds were made by directly joining Ni and Si 3 N 4 samples of same geometry by applying high temperature and enough mechanical pressure. The axial and radial strain profiles have been determined b…
It has been discovered that Spectra ® fiber can shift its peak melting temperature upward by almost 10 if it is maintained at constant length. Based on this, a novel processing method called high-temperature, high-pressure sintering has been developed in which Spectra ® cloth is consolidated using heat and pressure to…
The broadband (10 kHz–18 GHz) complex dielectric permittivity of electrically lossy aluminum silicate–pyrolytic carbon composites is studied as a function of carbon content. The composites are made from a commercial machinable ceramic that is treated by oxalic acid refluxing, followed by sucrose pyrolysis within the o…
The effect of Y 2 O 3 addition (0–5 wt%) on the densification and properties of reactive hot‐pressed alumina (Al 2 O 3 )–boron nitride composites based on the reaction between aluminum borate (2Al 2 O 3 ·B 2 O 3 ) and aluminum nitride (AlN) was investigated. The densification process was very sensitive to the amount o…
Abstract Dithia‐(dithienylethena)phane derivatives, composed of dithienylethene moieties and benzene bridges, were synthesized by a coupling reaction of the corresponding bis(chloromethyl)benzene with bis(mercaptomethyl)dithienylethene under high‐dilution conditions. The products exhibit photochromic properties upon i…
The effects of lanthanide co‐dopants on oxygen diffusion in yttria‐stabilized zirconia (YSZ) are studied using a combined first principles density functional theory (DFT)/kinetic Monte Carlo (kMC) modeling approach. DFT methods are used to calculate barrier energies for oxygen migration in different local cation envir…
An ultra‐thin Ni‐based metal used as the electrode layer in multilayer ceramic capacitor determines the dielectric performance of the capacitor. The warpage and the continuity of the inner electrode layers, and a dihedral angle between BaTiO 3 layers and metal electrodes of two ceramic capacitors (X7R and X5R) were ch…
Grain‐boundary (GB) segregation has been measured in Nb‐doped TiO 2 (rutile) by Auger electron spectroscopy analyses of the two surfaces exposed by inter‐granular fracture. In addition, the orientations of the exposed GB planes on both sides of the fracture surface have been determined. A strong anisotropy of GB compo…
We investigated optical excitations of transition-metal (TM) oxides with metal oxygen octahedra taking account of the orbital multiplicity effects. We predicted excitation energies of intersite d–d transitions and p–d transitions of TM oxides. We compared the evaluated excitation energies with reported experimental da…
Abstract A simple synthetic route for the efficient preparation and purification of two regioisomers of a pyrene derivative containing two ethynyl groups―1,6‐ and 1,8‐bis(ethynyl)pyrene―is described. The former compound was used as a building block for the stepwise synthesis of a highly conjugated, ditopic bis(2,2'‐bi…
Lanthanum‐doped ceria powder with a composition Ce 0.8 La 0.2 O 1.9 was prepared by heating the oxalate solid solution (Ce 0.8 La 0.2 ) 2 (C 2 O 4 ) 3 at 873 K in air. As‐prepared powder was densified to 96%–97% relative density by sintering in air at 1773 K for 4 h. The electronic current of the disk sample was measu…
Abstract The effects of dough aeration on measured bulk rheology of dough were investigated by preparing doughs with various gas contents and assessing their rheology under large deformation biaxial extension using the SMS Dough Inflation System. Doughs were mixed to various gas contents using a laboratory‐scale mixer…
A method for synthesis of high aspect ratio platelet seeds by growth of SrTiO 3 on Sr 3 Ti 2 O 7 core particles is reported. The aim of this study was to identify and control the morphology and size of SrTiO 3 particles via molten salt synthesis. Platelet and tabular morphologies with rectangular faces were obtained u…