ac conductivity of α-layered zirconium phosphate in the presence of water vapour at 100–200°C
1993; Elsevier BV; Volume: 61; Issue: 1-3 Linguagem: Inglês
10.1016/0167-2738(93)90344-3
ISSN1872-7689
AutoresMario Casciola, Fabio Marmottini, A PERAIO,
Tópico(s)Nuclear materials and radiation effects
ResumoThe conductivity of pellets of α-zirconium phosphate has been investigated between 100 and 200°C in a nitrogen atmosphere at different relative humidities. Impedance measurements were carried out as a function of temperature (100–200°C), at fixed relative humidity (RH=2%), and as a function of relative humidity (2%⩽RH⩽64%), at constant temperature (100°C). In both cases the conductivity was greatly enhanced by the presence of water vapour. The difference between the conductivity measured at 2% RH and that measured in dry nitrogen becomes larger with decreasing temperature due to the hydration increase of the material exposed to wet nitrogen. At 100°C the conductivity increases from 1×10−7 S cm−1 (2% RH) up to 5.5×10−6 S cm−1 (64% RH) mostly as a consequence of an increasing surface hydration. On the other hand, measurements carried out on the same pellet with different bulk hydration, showed that, at 2% relative humidity, there is a significant contribution (≈40%) of bulk water to the overall conductivity.
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