Search

Your search keyword '"OLLITRAULT-FICHET, R."' showing total 39 results
Start Over Author "OLLITRAULT-FICHET, R."
39 results on '"OLLITRAULT-FICHET, R."'

1. Induced magnetization in lithium doped YBa2Cu3Oy

Author

Maury, F., Nicola-Francillon, M., Nanot, M., and Ollitrault-Fichet, R.

Subjects
Semiconductor doping -- Research, Lithium -- Research, Magnetization -- Research, Physics
Abstract

A study is conducted on the magnetization of two series of samples of lithium doped YBaCuO. The first series of samples are annealed in oxygen and are orthorhomic and metallic while the second series are annealed in argon and are tetragonal and insulating. Results show that magnetization for both samples is similar at temperatures higher than the transition temperatures of the orthombic samples and up to 300 K. At lower temperatures and for tetragonal samples, magnetization is disproportional to the magnetic field.

Published
1999

2. Magnetic properties of the normal state of YBa2Cu(sub 3-x)Li(sub x)O(sub z)

Author

Nicolas-Francillon, M., Maury, F., Ollitrault-Fichet, R., Nanot, M., and Legeay, P.

Subjects
Superconductivity -- Research, Magnetization -- Research, Yttrium barium copper oxides -- Research, Physics
Abstract

A study was conducted to analyze the magnetic features of the normal state of YBa(sub 2)Cu(sub 3-x)Li(sub x)O(sub z). The effects of the green phase on the magnetic signal was also examined in the study. Results indicated that spin susceptibility decreases with the doping level during the gradual transition from a YBCO(sub 7)-type behavior. Findings also showed that the substitution of Cu(1) by Li+ in the structure changed the hole number.

Published
1998

6. Magnetic properties of the normal state of YBa2Cu3-+Li+Oz.

Author

Nicolas-Fancillon, M., Maury, F., Ollitrault-Fichet, R., Nanot, M., and Legeay, P.

Subjects
PHYSICS
Abstract

Presents information on a study conducted which investigated the magnetic properties of YBa2Cu3-+Li+Oz compounds, with reference to applied physics. Methodology used in the study; Details on the mechanism of superconductivity; Effects of lithium; Diamagnetism of the superconducting phase; Summarization of the results.

Published
1998
Full Text
View/download PDF

19. Formation of chabazite in mixes of calcium aluminate cement and silica fume used for caesium immobilization

Author

Vetter, G., Boch, P., Fryda, H., Ollitrault-Fichet, R., and Capmas, A.

Abstract

The immobilization of caesium with a mix of calcium aluminate cement (CAC) and silica fume (SF) was studied at 50°C. The presence of caesium within the hydration solution leads to the formation of a zeolitic phase of the chabazite family, which immobilizes caesium within the cementitious mix. A severe leach test shows that the immobilization is efficient. Chabazite is also formed when a Cs solution is in contact with an already hydrated CAC-SF mix. The structure of zeolites involves ceramic bonds that are more stable with heat treatment than hydrate bonds, which explains why chabazite is not destroyed by heat treatment at a temperature as high as 750°C. The presence of chabazite is therefore interesting for any application that requires thermal treatment.The immobilization of caesium with a mix of calcium aluminate cement (CAC) and silica fume (SF) was studied at 50°C. The presence of caesium within the hydration solution leads to the formation of a zeolitic phase of the chabazite family, which immobilizes caesium within the cementitious mix. A severe leach test shows that the immobilization is efficient. Chabazite is also formed when a Cs solution is in contact with an already hydrated CAC-SF mix. The structure of zeolites involves ceramic bonds that are more stable with heat treatment than hydrate bonds, which explains why chabazite is not destroyed by heat treatment at a temperature as high as 750°C. The presence of chabazite is therefore interesting for any application that requires thermal treatment.

Published
1996
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results