Abstract
Positron annihilation lifetime spectroscopy was conducted for a synthetic saponite to investigate hydration and dehydration behaviour occurring in nanoscale interlayer spaces. Long positron lifetime of ∼ 24 ns was observed with the intensity of ∼ 8 % when the sample is evacuated at ∼ 10−5 Torr. The radius of open nanospace evaluated from the positron lifetime is ∼ 10 Å, which corresponds to the interlayer spaces of saponite. The open nanospace increases up to 13 % after baking at 423 K for 8 h under the vacuum. The present results imply that positron annihilation spectroscopy is powerful tool to investigate hydration and dehydration behavior through the local structural changes in the interlayer spaces of clay minerals.
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