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Développement du procédé de chauffage micro-ondes en vue de l'élaboration de céramiques à propriétés électriques particulières.

Abstract : This work is devoted to the development of microwave heating process with the view of elaborating ceramics with particular electric properties. The aim is to valorize this heating process through the synthesis of functional ceramics. The manuscript presents interesting results which can be separated in two parts:
- Firstly, we studied the microwaves heating of refractory oxides in a resonant rectangular cavity TE102. Initially the synthesis by direct microwave heating of La0.8Sr0.2MnO3 (LSMO) was selected but the obtained results were not satisfying and the direct heating was modified by an indirect one. This new process allowed the successful synthesis and sintering of long LSMO bars in both static and continuous mode without deteriorating the high colossal magneto-resistance properties of this material. This process was also employed with success for the insulator BaZrO3 sintering.
- Secondly, we studied the texturation of YBa2Cu3OΔ prepared by the microwaves floating zone process. The objective was to improve the superconducting properties by controlling the crystallographic orientation. For that, two processes were developed. The first method consisted to substitute partially the calcium in the yttrium site, which allowed an effective optimization of the orientation and opened new perspectives for improving the processing and properties of superconducting materials. The second method combines the floating zone with the top seeding method. Samples obtained by this method showed satisfactory superconducting properties. The texture was analysed and studied by EBSD, XRD, and neutron diffraction.
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Contributor : David Grossin <>
Submitted on : Saturday, May 19, 2007 - 11:13:11 AM
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  • HAL Id : tel-00147635, version 1


David Grossin. Développement du procédé de chauffage micro-ondes en vue de l'élaboration de céramiques à propriétés électriques particulières.. Matériaux. Université de Caen Basse-Normandie, 2006. Français. ⟨tel-00147635⟩



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