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The aim of the present work is to evaluate the influence of La 6 W 2 O 15 secondary phase on the properties and integrity of La 6-x WO 12-? –based membranes. Structural, microstructural and thermo–chemical study was carried out evidencing significant crystallographic and thermal expansion anisotropy: the reason for poor thermo–mechanical stability of La 6 W 2 O 15 . Conductivity of La 6 W 2 O 15 was one to two orders of magnitude lower compared to the phase pure La 6-x WO 12-? in the range of 300 to 900 °C. The relaxation study showed that the hydration process was faster for the La 6 W 2 O 15 compared to the LWO phase, due to the higher electronic contribution to the total conductivity. Short–term stability tests in H 2 at 900 °C and in a mixture of CO 2 and CH 4 at 750 °C were conducted and material remained stable. Remarkable reactivity with NiO and YSZ at elevated temperatures was further evidenced compared to the relative inert behavior towards MgO and CGO. Keywords: La 6 W 2 O 15 , La 6-x WO 12-? , mixed protonic–electronic conductor, dense ceramic membrane, hydrogen separation.

Influence of the La6W2O15 Phase on the Properties and Integrity of La6-xWO12-?–Based Membranes