LAUSR

Abstract The paper reports novel proton-conducting composites in the Ba 2 In 2 O 5 –Ba 2 InTaO 6 eutectic oxide system. The samples were prepared in situ by solid state reaction method; their microstructural, thermal and electrical properties were investigated. The results show an essential conductivity enhancement of the (1- x )Ba 2 In 2 O 5  ∙  x Ba 2 InTaO 6 samples both in dry and wet conditions compared with those for Ba 2 In 2 O 5 and Ba 2 InTaO 6 phases. The effect is maximal (near 2 orders of magnitude) for the composites with x  = 0.2, 0.3, which retain a possibility to a water uptake and demonstrate the predominantly proton conduction at temperatures below 500 °C in wet air.