GUILHOT , Bernard

Az alumínium-oxid alapú kerámiaanyagok tekinthetok az elsö modern kerámiáknak, melyek mind technológíai mind tudományos szempontból kiemelkedö fontosságúak. Feldolgozási technológiájuk és tulajdonságaik javulása igen szoros kapcsolatban van a szinterelésük mechanizmusára vonatkozó ismeretek bóvülésével1. A szinterclés a szilárd anyagok...

Thanks to its high thermal conductivity, aluminum nitride may be a serious candidate as fuel coating for the Gas Fast Reactor. However, its behavior under irradiation is not entirely well understood. In order to catch a glimpse of this behavior, specimens were irradiated with swift heavy ions of different energies then characterised by both...

Thanks to its high thermal conductivity, aluminum nitride may be a serious candidate as fuel coating for the Gas Fast Reactor. However, its behavior under irradiation is not entirely well understood. In order to catch a glimpse of this behavior, specimens were irradiated with swift heavy ions of different energies then characterised by both...

The properties of thermoluminescence (TL) observed from various mixed rare earth (RE) phosphate powders La1−x−yCexTbyPO4 are reported. TL peaks appear around −175°C, −135°C, −80°C, −35°C and +25°C and the TL emission spectra of La1−x−yCexTbyPO4 are mainly composed of characteristic line transitions of Tb3+ ions. The results show that the...

Data concerning thermostimulated luminescence (TL) and fluorescence spectra are given for a scries of ruby monocrystals obtained by Verneuil's method, and containing several values of Cr3+concentration, up to 12000 ppm.

Thanks to its high thermal conductivity, aluminum nitride may be a serious candidate as fuel coating for the Gas Fast Reactor. However, its behavior under irradiation is not entirely well understood. In order to catch a glimpse of this behavior, specimens were irradiated with swift heavy ions of different energies then characterised by both...

The formation of SrAl2O4 by solid state reaction between SrCO3 and Al2O3 has been studied. The firing conditions, namely the time, the atmosphere and the temperature, have been optimized so as to obtain pure well crystallized SrAl2O4, allowing the further study of the influence of the atmosphere on the optoelectronic properties of the phosphor....

The thermoluminescence method (TL), or the thermostimulated luminescence is one of the techniques which correlate thermal and optical methods and usually used to characterize the defects occuring in insulating or semiconductors materials. After a brief description of the TL phenomenon based on the example of alpha alumina, we present some...

Two parameters were studied upon the thermoluminescence (TL) properties and the sintering behaviour of a-alumina: the atmosphere during the heat treatment used to transform gamma -Al2O3 into alpha -Al2O3 and the doping by Zr and Th. It appears that a reducing atmosphere tends to delay the sintering compared with the oxidising atmosphere until...

For Generation IV reactors, and more particularly the Gas Fast Reactor, aluminum nitride is an interesting candidate for the application as fuel coating; actually, its great thermal conductivity should allow efficient thermal transfer between the fuel pellets and the coolant. Unfortunately, few data are available on its behavior under...

The dependence of the firing conditions on the crystal structure formation of ZnGa2O4 has been investigated. The effects of temperature and atmosphere were examined and gave evidence of the instability of the zinc gallate under a reducing atmosphere at temperatures above 600 degrees C. A new preparation route has allowed to synthesize ZnGa2O4...

Two parameters were studied upon the thermoluminescence (TL) properties and the sintering behaviour of α-alumina: the atmosphere during the heat treatment used to transform γ-Al2O3 into α-Al2O3 and the doping by Zr and Th. It appears that a reducing atmosphere tends to delay the sintering compared with the oxidising atmosphere until 1600°C....

The dependence of the firing conditions on the crystal structure formation of ZnGa2 O4 has been investigated. The effects of temperature and atmosphere were examined and gave evidence of the instability of the zinc gallate under a reducing atmosphere at temperatures above 600°C. A new preparation route has allowed to synthesize ZnGa2 O4 at...