|About this Abstract
||Materials Science & Technology 2019
||Materials Issues in Nuclear Waste Management
||Electrical Properties of Nuclear Glasses
||Muriel Neyret, Dylan Jouglard, Norma Pereira Machado, Rafael Bianchini Nuernberg, Leire del Campo, Mohammed Malki, Andrea Piarristeguy, Annie Pradel
|On-Site Speaker (Planned)
||Rafael Bianchini Nuernberg
Borosilicate glass is recognized as a reference conditioning material for High-Level radioactive Waste. In ceramic or cold crucible melters, glass melting is based on Joule effect ; molten glass electrical conductivity is then an important property to control.This study deals with the description of electric charge motion phenomena involving electrical properties of nuclear borosilicate glasses. Simplified glasses containing 5 oxides (SiO2-B2O3-Na2O-CaO -RuO2 or -MoO3), representative of HLW glasses, have been characterized in a wide range of temperature by impedance spectroscopy. The impact of heterogeneities, such as undissolved RuO2 or other crystals (CaMoO4,…) on glass electrical properties has been discussed. Whereas glass electrical conductivity is not strongly impacted by molybdate crystals, it increases suddenly when RuO2 content reaches a concentration of 2.2wt% corresponding to a low electrical percolation threshold. Electric force microscopy and some specific experiments allowed to explain this phenomenon by the enrichment of the borosilicate matrix in dissolved RuO2.