Materials Literature
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Microcavity organic light-emitting diodes (MC-OLEDs) based on porous silicon distributed Bragg reflectors (PS-DBRs) have been realized, and improved structural, optical, and electrical properties have been observed. In the device, a multilayer OLED functions as the central active element, sandwiched between a top silv…
Fabrics based on high-strength nylon and aramid fibers are known to have the ability to strongly dissipate energy upon ballistic impact. This study addresses the causes of this behavior, and it is concluded that the principal contribution to energy dissipation upon transverse ballistic impact is made by friction betwe…
The effect of sulfuric acid concentration on Cl2 evolution in the reaction between O3 and Cl− has been investigated. The catalytic effects of metal ions in this reaction have been studied as a function of solution acidity. The chlorine evolution rate increases markedly with increasing acid concentration. At acid conce…
Ab initio energetic calculations based on the density functional theory (DFT) and the projector augmented wave method (PAW) for determining the polymorphisms of lanthanide sesquioxides Ln2O3 (where Ln = rare-earth element, Y, and Sc), LnMO3 perovskites (where M = Al and Ga), and Ln2B2O7pyrochlores (where B = Ti, Zr, a…
Crystallization of borosilicate glasses, used now for solidification of liquid nuclear high-level wastes (HLW), is accompanied by the formation of silicates with the apatite-type structure and high contents of actinides and REE. The stability of these silicates determines the safety of immobilization of radionuclides.…
Ceramic matrix composites (CMCs) comprise a fiber reinforcement embedded in a ceramic matrix, the two main constituents being bonded through an interphase, which is a thin layer of a compliant material with a low shear stress, arresting and deflecting the matrix microcracks formed under load. Non-oxide CMCs, such as C…
The oxygen free SiC fiber (Hi-Nicalon) has been commercially produced by an electron beam curing process. And then the SiC fiber (Hi-Nicalon Type S) having stoichiometric SiC composition and high crystallinity has been developed. Hi-Nicalon fiber has higher elastic modulus and thermal stability than Nicalon fiber. The…
This work aims to study thermal stability, frequency response, and refractive indices in a (001)-cut Pb(Zn1∕3Nb2∕3)0.90Ti0.10O3 (PZNT10%) crystal before and after an electric (E)-field poling, which are important for piezoelectric and optical uses. Dielectric permittivities have been measured as functions of temperatu…
This paper investigates a subject of high practical importance and proposes representative frequency range definition for HVAC testing with PD measurement which can improve both, on-site and laboratory testing. It will also strengthen the clear connection between stresses in service and HVAC testing. Furthermore it cr…
Nous avons affine la structure cristalline de la brandtite [Ca2(Mn,Mg)(As04)2(H 2 O)2, monoclinique, a 5.877(1), b 12.957(2), c 5.675(1) A, β 108.00(3)°, V 411.0 A 3 , groupe d'espace P2 1 /c, Z = 2], la collinsite [Ca2(Mg,Fe)(PO 4 ) 2 (H20)2, triclinique, a 5.729(1), b 6.778(1), c 5.444(1) A, a 97.31(3), β 108.63(3),…
We describe the first chlorine-free synthesis of nanozirconooligocarbosilanes through thermal cocondensation of low-molecular oligocarbosilanes and zirconium tetrakis(diethylamide). The starting reagents, reaction intermediates, and final products have been characterized by 1 H, 13 C, and 29 Si nuclear magnetic resona…
The influence of domain switching on the evolution of macroscopic polarization in the ferroelectric Pb(Mg1∕3Nb2∕3)1−xTixO3 material was studied. Domain switching during the application of a compressive stress was evaluated using in situ x-ray diffraction. It was found that stress depolarization was controlled by 90° d…
Ag-ceramic composite materials were investigated as low-cost internal electrodes for low firing piezoelectric multilayer ceramic actuators. Ag-ceramic pastes were prepared by adding PZT-based ceramic powders to a commercial Ag paste in the range of 0 to 50 wt %. PZT/Ag-PZT multilayered laminates were fabricated using…
Abstract Thermal behavior of poly(ethylene imine) [PEI] has been studied using simultaneous WAXD/DSC measurement system. PEI exhibits water‐induced and thermally‐induced phase transitions among four kinds of crystalline hydrates: anhydrate (EI/water = 1/0), hemihydrate (1/0.5), sesquihydrate (1/1.5), and dihydrate (1/…
The structure and properties of both natural and industrial glasses are influenced by the presence of small amounts of specific elements. Selected examples illustrate the roles of various elements in controlling properties such as coloration, stability, and optical and thermal properties, as well as the effect of redo…
A simple one port reflection method is proposed to measure the large signal permittivity and loss tangent of ferroelectric films. The microwave power levels are changed in the range from −10to17dBm at 0V dc bias. Microwave power causes two effects: (i) generation of higher order harmonics due to the dielectric nonline…
Based on the Ni-Cu system, catalysts were developed for low-and high-temperature industrial gas and waste gas purification. It was found that, regardless of the preparation procedure, the formation of a catalytically active structure occurred via the formation of a Ni-Cu solid solution at the stage of activation. The…
We have successfully fabricated high-contrast microcell liquid crystal displays (LCDs) using microstructure replication technology in thin plastic film substrates. These novel flexible LCDs comprise microcell replication, alignment treatments, and cell assembly. The cell gap of such flexible LCDs was maintained well b…
This paper presents a 3D electric-field calculation model of the plusmn800 kV DC transmission line composite insulators based on finite element method. With this 3D model, this paper introduces the effect of the tower, transmission lines and the parameters of the corona rings on the potential and e-field distribution…
We determined the positions of all atoms, including the light ones (D, H), in the crystal structure of synthetic ferricopiapite Fe{sub 14/3}(SO{sub 4}){sub 6}(OD,OH){sub 2}(D{sub 2}O,H{sub 2}O){sub 20}, using X-ray synchrotron [{lambda}0.64905(1) {angstrom}] and neutron ({lambda}2.0787 {angstrom}) powder diffraction.…