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3 2001

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Nanoparticles of cerium dioxides for gas sensor applications.

Villain S., Leroux C., Musso J., Fremy M.A., Pischedda M.H., Gavarri J.R.

Inżynieria Materiałowa

2001

R. XXII, nr 5

935-938

The aim of this work is to elaborate nanostructured cerium dioxides for catalytic and gas sensor applications. Nanosized cerium oxide powders were prepared via three chemical routes: 1) chemical precipitation followed by high-energy mechanical milling; 2) soft chemical preparation, 3) an unusual method of pulverization of liquid solution developed in our laboratory. The obtained powders were characterized using X-Ray diffraction analyses and Transmission Electron Microscopy experiments. Nanoparticles of pure CeO2 oxide having their sizes ranging from 2 to 10 nanometers have been obtained.

Influence of the microstructure on the electrical percolation in metal/insulator composites.

Thommerel E., Valmalette J.C., Musso J., Gavarri J.R.

Inżynieria Materiałowa

2001

R. XXII, nr 5

924-924

Degradation and percolation in composite materials.

Gavarri J.R., Thommerel E., Villain S., Musso J., Valmalette J.C., Kopia A., Suliga I., Kusiński J.

Inżynieria Materiałowa

2001

R. XXII, nr 4

332-332

In this work, we present various modelling approaches available for describing the chemical evolution of a solid polycrystalline system made of at least two phases: these phases can be insulating or conducting, they can be corroded in aggressive environments, or react together at high temperature. Generally, in the case of heterogeneous systems, Avrami models seem to be well adapted to interpret the experimental data. To follow the chemical evolutions as a function of time or composition, we make use of a main technique the electrical complex impedance spectroscopy (ECIS) in a large frequency range (from 10 to the -1 to 10 to the 7 Hz).