Hydrostatic pressure decreases the proton mobility in the hydrated BaZr0.9Y0.1O3 proton conductor

Chen, Qianli; Braun, Artur; Ovalle, Alejandro; Savaniu, Cristian-Daniel; Graule, Thomas; Bagdassarov, Nikolai
July 2010
Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p041902
Academic Journal
Impedance spectroscopy on the hydrated proton conductor BaZr0.9Y0.1O3 at high temperatures shows that the bulk proton conductivity activation energy Eb scales with the strain parameter [variant_greek_epsilon], as achieved by hydrostatic pressures up to 2 GPa, suggesting that large lattices favor proton diffusivity. At high temperature, Eb increases upon pressure by 40%. The grain boundary activation energy Eg is around twice as Eb, indicating higher proton mobility in grain boundaries as a result of pressure induced sintering. An expanded lattice with strain parameter [variant_greek_epsilon]>1 should have lower Eb, suggesting that thin films expansive tensile strain could have larger proton conductivity.


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