Materials Literature
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In this report, we experimentally and numerically studied the transmission spectra of combined metamaterial structure which consists of cut-wire pairs and continuous wires. The effective permittivity and permeability were extracted from the complex scattering parameters utilizing the standard retrieval procedure. By e…
A series of doped LaGaO3 perovskite type oxides is considered as the electrolyte of solid oxide fuel cells (SOFCs), due to their high oxide ionic conductivity. However, detailed defect chemistry, particularly the relationship between oxygen nonstoichiometry and lattice parameter under operating condition of SOFCs has…
Small additions of indium are found to introduce low-melting-temperature phases in PrCo5-based magnets. The sintering temperature of anisotropic powders with 0.5 at.% indium can be reduced from 1100degC to 950degC-975degC, resulting in increase of remanent magnetization of the optimally heat-treated sintered magnet fr…
A detailed study of the magnetic properties of single crystalline Ge1-xMnxnanowires is presented. Free-standing nanowires with an averaged diameter of 30-180 nm and several microns in length were grown by a supercritical fluid-liquid-solid method. The absence of various Ge-Mn crystallographic precipitates and oxide sh…
Epitaxial conducting electrodes (60-300 nm thick) of LaNiO3, La1-xKxMnO3 and ferroelectric KNbO3 thin films were deposited by MOCVD using thd-volatile precursors on SrTiO3 and MgO single crystalline substrates. Influence of epitaxial strain on properties is discussed. Ferroelectric properties of the title heterostruct…
Thanks to relaxed pattern dimensions and friendly wet process cost, MEMS technology uses a great number of wet etch process steps during process flow. Nevertheless, as dimensions are downscaling, for the very used gold wet etch process, a limited under etch of the gold layer under photo resist mask is required. This p…
Solid oxide fuel cells (SOFCs) have been developed for power generation applications and in the reverse operating mode for hydrogen and oxygen production. In both operating modes, stable performance and high efficiency are very much dependent on operating characteristics of the stack within the system. Several of the…
The defect and transport properties of dense thin films of SrTi 1-x Fe x O 3-δ (STF), deposited by PLD onto single crystal YSZ and MgO substrates, were investigated based on the analysis of the chemical capacitance and the DC electrical conductivity as a function of temperature, pO 2 , and Fe fraction. The magnitude o…
Abstract A study of the influence of water environments on the cyclic fatigue crack behavior of polyvinyl chloride (PVC), with (PVC‐M) and without (PVC‐U) chlorinated polyethylene (CPE) impact modifier was undertaken and compared with corresponding results in air. Two frequencies of 1 and 7 Hz were applied to assess t…
Left-handed characteristics of microstrip line on the longitudinally magnetized ferrite substrate are investigated with both theoretically and experimentally. Transmission characteristics of the line are estimated by using an equivalent circuit model, and the high frequency structure simulator (HFSS) based on the fini…
Homogeneous thermal decomposition pathways (C2H5)3Ga (TEGa) were followed using in situ Raman spectroscopy measurement in an up-flow, cold-wall CVD reactor. The results of Density Functional Theory (DFT) calculations were used to assign measured Raman bands to the decomposition products (Et)3Ga, (DEGa)2, (Et)GaH-Ga(Et…
The structural, magnetic and electrical properties of Co2MnSi thin films grown onto n-doped Si(110) and n-Si(100) substrates were studied. The structure and magnetic properties of Co2MnSi thin films were found to depend strongly on the annealing temperature (TA). AtTA= 275-350degC, the Co2MnSi films were of B2 phase w…
Photovoltaic cell performance can be greatly improved by optimising the transparent conducting oxide used as the front contact. We have developed an advanced atmospheric pressure chemical vapour deposition (APCVD) process, by applying fast experimentation and using a combinatorial chemistry approach to aid the studies…
Gd$_{5}$Si$_{2}$Ge$_{2}$is known for its giant magnetocaloric effect (GMCE), but also for its associated large hysteretic losses. These losses result in a significant reduction in the net cooling capacity of this material when it is used for magnetic cooling. Attempts have been made to reduce these losses by adding ot…
Sr-doped lanthanum manganites (LSM) have been studied as promising materials for cathodes in solid oxide fuel cells (SOFC). In the present work La0.7Sr0.3MnO3 powders were synthesized by solid-state method evaluating the influence of dry or wet (using isopropanol) routes and different grinding times on the morphologic…
NiO/YSZ hollow fibers were fabricated via a combined phase inversion and sintering technique, where polyethersulfone (PESf) was employed as the polymeric binder and N-methyl-2- pyrrolidone (NMP) as solvent. After sintering at 1400{degree sign}C and being reduced by hydrogen at 800{degree sign}C, the hollow fibers show…
Recently, the standard manufacturing route for solid oxide fuel cells has been changed from warm pressing of the anode substrate of Coat Mix® powders towards tape casting of a mixture of yttria stabilized zirconia and nickel oxide to the anode substrate. Due to different shrinkage behavior, especially heat treatment s…
Crystal structure and mechanical properties of La2NiO4+d were measured by high temperature X-ray diffractometry and in-situ small punch test as a function of temperature and oxygen partial pressure. As P(O2) increases, the lattice parameter perpendicular to the perovskite layer increases and that parallel to the layer…
This paper discusses combined high-permeability and high-permittivity magnetodielectric thin films for microwaves. The results are based on outstanding material properties: epsiv = 18, mudc= 180, fr= 4.8 GHz, and Deltaf= 480 MHz. This material combines exchange coupled high-magnetization ferromagnetic thin films and S…
This work is focused on the evaluation of different Ga(III) precursor (conventional acetylacetonates, malonates and amides) for the MOCVD of Ga2O3 thin films. In particular, the attention is devoted to a thorough comparison of the precursor qualifying properties (volatility, thermal stability under the vaporization co…