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High-Temperature Phase Transitions In Rbh2po4, Heber Jair Martinez
High-Temperature Phase Transitions In Rbh2po4, Heber Jair Martinez
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Recent studies have shown that the proton conductivity of MH2PO4 (M=Cs, Rb) solid-acids exhibits a sharp, several-order-of-magnitude increase upon heating above a certain temperature threshold [Boysen et al., Chem. Mater. 15, 727(2003), Boysen et al., Chem. Mater. 16, 693(2004)]. This so-called superprotonic behavior allows the above-mentioned compounds to function as fuel-cell electrolytes at intermediate temperatures [Boysen et al., Science 303, 68(2004)], a remarkable application that has attracted much interest. Yet, the crystal structures and microscopic mechanisms responsible for this heating-induced proton conductivity enhancement are not fully understood.
Our group has previously demonstrated [Botez et al., J. Chem. Phys. 127, 194701(2007)] …