in this research work nano porous silicon layers with different porosity were prepared by using electrochemical etching. surface morphology and size of pores were investigated by scanning electron microscopy (sem).tio2 thin films with ebpvd method have been deposited on the surface of psi layers. the influence of anodization conditions such as anodization time interval and current density on el...

The electrical conductivity and density of the low-melting CaCl2-NaCl-Al2O3 systems at 550°C~800°C ranges were respectively measured by the Continuously Varying Cell Constant Technique, ac-techniques and Archimedes method. The materials were applied as the electrolyte for the direct electrochemical reduction solid Al2O3 at 550°C ~800°C. The materials were composed of 71wt.%~87wt.%CaCl2 (corresp...

The compound CsH2PO4 has emerged as a viable electrolyte for intermediate temperature (200-300 degrees C) fuel cells. In order to settle the question of the high temperature behavior of this material, conductivity measurements were performed by two-point AC impedance spectroscopy under humidified conditions (p[H2O] = 0.4 atm). A transition to a stable, high conductivity phase was observed at 23...

Investigations of solid solutions of CsHSO, and CsH2P04 have led to the discovery of a new compound with a sulfate to phosphate ratio of 2 : 1. Single-crystal X-ray data showed the as-synthesized phase to be monoclinic and not isostructural with any known compounds. AC impedance measurements revealed that, upon heating, the compound undergoes a transformation into a phase of high conductivity a...

Novel hybrid carbon materials such as activated carbon-carbon nanotubes (AC-CNTs) and spheres/activated (CSs/AC-CNTs) based on (AC) derived from the pits of Algerian date palm have been prepared characterized. In addition, paste electrodes graphite (GC) cavity microelectrode (CME) modified with these were used to detect gallic acid at pH = 7 using square wave voltammetry method (SWV). The condu...

We carried out the study on NiTiO3 synthesized via citrate-gel method. Structural characteristics were determined by XRD and SEM. The impedance spectra analysis was used to elucidate dependence of complex values temperature frequency. correlation between DC-conductivity inverse presented it complied with semiconductor behavior Arrhenius type. real dielectric constant, loss AC-conductivity repor...

The work presented in this paper proposes an approach to reduce the common mode voltage at the output of matrix converters when a direct torque control scheme is employed to drive a permanent magnet synchronous motor. A mathematical analysis of the common mode voltage at the output of matrix converters is firstly carried out which is then corroborated by simulation results. Based on this analys...

Using our recently developed Chebyshev expansion technique for finite-temperature dynamical correlation functions we numerically study the AC conductivity σ(ω) of the Anderson model on large cubic clusters of up to 100 sites. Extending previous results we focus on the role of the boundary conditions and check the consistency of the DC limit, ω → 0, by comparing with direct conductance calculati...

Conduction and dielectric behavior of Sr0.97(Ti12xFex)O32d solid solutions were studied. The temperature dependence of the dc conductivity with s}A exp(2BT) obtained, indicated a variable-range hopping mechanism. A low-frequency dielectric relaxation was also observed. The activation energy for the variablerange hopping conduction is slightly higher than that for dielectric relaxation, suggesti...