Materials Literature
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In order to increase the knowledge of the processes involved during the degradation of insulating silicone gels under AC stress, recordings of the activity of partial discharges (PD) are performed. Silicone gels are commonly used for the insulation and packaging of high voltage semiconductors such as IGBT modules. We…
In recent years, much effort has been devoted to the effects associated with the presence of nanostructures in bulk materials. Since the introduction of the concept of "Nanodielectrics", various research activities concurred to confirm that these new materials form a special class of composites showing potential. In t…
Glass formation in the InF 3 -BiF 3 -BaF 2 system is studied. Partial substitutions of BiF 3 for InF 3 in the InF 3 -BaF 2 system reduce the glass-transition and glass-crystallization temperatures and increase the thermal stability range and refractive index. The glass structure is studied using IR and Raman spectrosc…
The reaction of 3,4,5,6-tetrafluorophthalonitrile with 1-adamantanol, 1-adamantylamine, 1-adamantanemethanol, and 1-adamantaneethanol gave 4,5-di-(1-adamantyloxy)-3,6-difluorophthalonitrile, 4,5-di-(1-adamantylamino)-3,6-difluorophthalonitrile, 4-(1-adamantylamino)-3,5,6-trifluorophthalonitrile, 3,4,5,6-tetra-(1-adama…
Square grids of gold dots were prepared from several nanometer gold films by locally confined excimer laser ablation. Diffraction-mask projection laser ablation at a wavelength of 248 nm was used to convert Au films of 3, 6 and 9 nm thickness on sapphire substrates into well-ordered arrangements of substrate-adhered g…
Next to conducting polymers and carbon nanotubes (curved, closed graphenes), the material that can bring revolution in electronics is planer graphene (PG)/planer few layer graphenes (PFLG). Synthesis of PG and PFLG by simple, economical and re-producible method was a challenge. We synthesized PFLG films from camphor p…
Low density polyethylene (LDPE) is widely used as a dielectric insulation of power cable. It has already reported that an incorporation of MgO nanoparticles in LDPE matrix could provide dielectrics with new and improved properties under dc high field. This paper describes high field dielectric properties of LDPE/MgO n…
Abstract Thermal residual stresses (TRSs) in continuous Al 2 O 3 fiber reinforced NiAl composites with and without a BN interlayer were studied by using the finite element method (FEM). The FEM model includes the effect of neighboring fibers of the composite. A minimum sample thickness and a minimum size of the surrou…
We have revealed interfacial chemical interaction in Y3Fe5O12/Ba1−x PbxTiO3 magnetoelectric mixture composites during high-temperature firing. The interaction leads to the formation of pyrochlore impurity phases (x > 0.2) and yttrium orthoferrite (x = 0, t = 1300°C). Electrical and piezoelectric characterization resul…
A capacitor discharge joining technique used to fabricate an alumina-(Al2O3) tile-titanium-foil-Al2O3-tile joint was investigated to clarify the influence of titanium foil width on bonding strength. A several-kiloampere pulse current was supplied from an 8.28-muF storage capacitor to the titanium foil while simultaneo…
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),…