Diffusion mechanism of cesium ions in compacted montmorillonite

摘要: Abstract For the safety assessment of geological disposal high-level radioactive waste, diffusion behavior Cs+ ions in compacted Na- and Ca-montmorillonite mixtures was studied. The apparent coefficients were determined as functions temperature ionic equivalent fraction Ca2+ ions. almost constant at higher temperatures, 323 313 K, while they decreased with increasing lower 298 288 K. activation energies for also from dependence each fraction. energy increased 34 kJ mol−1 to 38 kJ mol−1 zero 0.75, after which it steeply reached 49 kJ mol−1 fractions 0.94 1.0. These findings cannot be explained by pore water or surface models. Interlayer is suggested most probable explanation