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Metal-Doping of La 5.4 MoO 11.1 Proton Conductors: Impact on the Structure and Electrical Properties.
Inorganic Chemistry 2018 October 16
La5.4 MoO11.1 proton conductors with different metal doping (Ca2+ , Sr2+ , Ba2+ , Ti4+ , Zr4+ , and Nb5+ ) have been prepared and structurally and electrically characterized. Different polymorphs are stabilized depending on the doping and cooling rate used during the synthesis process. The most interesting results are obtained for Nb-doping, La5.4 Mo1- x Nb x O11.1- x/2 , where single compounds are obtained in the compositional range 0 ≤ x ≤ 0.2. These materials are fully characterized by structural techniques such as X-ray and neutron powder diffraction and transmission electron microscopy, which independently confirm the changes of polymorphism. Scanning electron microscopy and impedance spectroscopy measurements in dry/wet gases (N2 , O2 , and 5% H2 -Ar) showed an enhancement of the sinterability and electrical properties of the materials after Nb-doping. Conductivity measurements under very reducing conditions revealed that these materials are mixed ionic-electronic conductors, making them potential candidates for hydrogen separation membranes.
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