Materials Literature
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The electrical properties of Er2O3-doped bismuth titanate，Bi4-xErxTi3O12 (BET) ceramics prepared by a conventional electroceramic technique were investigated. XRD analyses revealed Bi-layered perovskite structure in all samples. SEM micrographs showed randomly oriented and plate-like morphology. For the samples with x…
Bi3.25Gd0.75Ti2.97V0.03O12 (BGTV) ceramics were prepared by solid state reaction. These samples had polycrystalline Bi-layered perovskite structure without preferred orientation, and consisted of well developed plate-like grains with random orientation. The remanent polarization and the coercive field of the BGTV were…
The ferroelectricity of Bi3.2Er0.8Ti3O12 (BET), and Bi3.2Er0.8Ti2.97V0.03O12 (BETV) ceramics prepared at 1100°C by a conventional ceramic technique was investigated. These ceramics possess random-oriented polycrystalline structure. The remanent polarization (Pr) and coercive field (Ec) of the BET ceramics are 18 µC/cm…
REMERCIEMENTSTout d'abord, merci à mon directeur de recherche, le professeur Michel Meunier.Il m'a été d'un grand soutien et ses suggestions m'ont beaucoup aidé à faire avancer le projet.Je tiens aussi à le remercier de m'avoir donné la chance de participer à plusieurs conférences.Je tiens aussi à souligner ma reconna…
Les technologies de gravure profonde de silicium par plasma peuvent etre utilisees pour la fabrication de miroirs verticaux a alternance de couches de silicium et d'air. Comparativement aux miroirs hors-plan fabriquees par deposition de couches minces, ces miroirs verticaux peuvent etre integres, de facon simple et mo…
The plasma electrolytic oxidation(PEO) process of the potassium fluorozirconate electrolyte were investigated with disodium hydrogen phosphate used as additives. Ceramic films were prepared on magnesium alloy in electrolytes with different content of disodium hydrogen phosphate under constant voltage. The effect of di…
This paper presents an analytical solution for two-dimensional conductive heat transfer in spherical composite pressure vessels. The vessels are in a spherical shape and fibers are winded in circumferential direction. The vessel is made of one-layer reinforced composite material. The analytical solution is obtained un…
The optical and electronic properties of organic semiconductors (di-octyl substituted polyfluorene, ladder type poly(para-phenylene) (LPPP) and donor-acceptor polymer heterojunctions) are investigated under high pressure.A comparison of the photoluminescence spectra of as-is and thermally cycled di-octyl substituted p…
Bi3.25Er0.75Ti3O12(BET) and Bi3.25Er0.75Ti2.97V0.03O12(BETV) thin films with random orientation were fabricated on Pt/Ti/SiO2/Si substrates by rf magnetron sputtering technique. These samples had polycrystalline Bi-layered perovskite structure without preferred orientation, and consisted of well developed rod-like gra…
Temperatures of the carbide tip's surface when turning Carbon-Fiber-Reinforced-Plastics (CFRP) materials with a K type sharp main cutting edge tool considered wear is investigated. The frictional forces and heat generated in the basic cutting tools are calculated by using the measured cutting forces and the theoretica…
The Ferroelectric properties and Microstructures of Bi3.3Tb0.6Ti3O12 (BTT) and Bi3.3Tb0.6Ti2.97V0.03O12 (BTTV) ceramics prepared at 1100°C by a conventional ceramic technique were investigated. These ceramics possess random-oriented polycrystalline structure. The remanent polarization (Pr) and coercive field (Ec) of t…
This paper presents a probabilistic methodology in evaluating corrosion defect characteristics of carbon steels offshore pipelines. A nonlinear multivariate regression model was selected to describe the correlation among corrosion defect parameters while the least-squares method was used to minimize its residuals. The…
The TiB2-Al2O3 porous composites were obtained in situ by self-propagating high temperature synthesis (SHS) of TiO2-B2O3-Al System. The reaction was carried out in a SHS reactor under static argon gas at the pressure of 0.5 MPa. The standard Gibbs energy minimization method was used to calculate the equilibrium compos…
This paper presents the structural, ferroelectric, ferromagnetic, resonance and magnetoelectric (ME) properties of multilayered ME composites fabricated using molten-salt synthesis method. The compositions corresponding to CoFe2O4 (CFO) with particle size of ~ 150 nm and Ba0.8Sr0.2TiO3 (BST) with particle size of ~ 10…
Blended elemental powders with the nominal compositions (at%) of Ti50Al50, was mechanically alloyed in a planetary ball milling system for up to 100h, an amorphous Ti50Al50 phase was obtained in the process. The amorphization process as a function of time of milling was monitored by scanning electron microscope, X-ray…
기존의 반사형 타원계에 광분할기와 프리즘 등의 광학소자를 추가하여 8.0 ㎛ 보다 작은 면적에서 시료의 광학이방성을 측정할 수 있는 수직반사형 타원계를 제작하였다. 수직반사 구조를 구현하기 위해 사용된 광학소자들의 편광작용을 보정하여 광학이방성 측정의 정확도를 향상시켰다. 비편광 광분할기를 사용하고 사분파장 위상지연자를 장착하며 광섬유를 제거하고 파장영역을 최적화하여 광학이방성인자 측정값의 표준편차를 0.00083 으로 줄이고 방위각 변화에 따른 rutile 시료의 광학이방성인자의 변동폭을 0.015 이하로 줄일 수 있었다.
degassing, crystallization of thin-films, tempering, forming, and precompaction. Estimation of the characteristics of transient heating stages and thermal non-uniformities on a single glass substrate or in a stack of glasses are extremely helpful to understand non-homogeneity of mechanical and electronic features of n…
A series of bulk polycrystalline samples of La0.6Sr0.15Na0.10.15MnO3( represents vacancy)with Ag addition were prepared by conventional Sol-gel reaction processing in air.The mol proportion between La0.6Sr0.15Na0.10.15MnO3 and Ag is 1:x (x=0.00,0.016,0.04,0.1). This article focuses on the impact of Ag doping on the…
Pr0.5Ca0.5Mn0.99Al0.01O3 compound was prepared by standard solid state reaction to study its ac susceptibility at low temperatures. The X-ray powder diffraction patterns show that the compound is single-phase orthorhombic structure. The cusps of charge ordering and the long range AFM order of the “pseudo”-CE type are…
La0.6Sr0.4Co0.2Fe0.8O3-δ composite oxide was prepared and characterized. Dilatometer and four-probe DC were exploited to investigate the thermal expansion and electrical conductivity, respectively. The thermal expansion curve was linear, but it became steeper at the high temperature region, as a result of the loss of…