BaCe0.95Yb0.05O3 perovskite was studied for its potential use in hydrogen permeable membranes. Raman spectroscopy, X-ray diffraction, and synchrotron radiation X-ray diffraction were used to study the phase transitions and proton transport in the material. The phase transformations of the perovskite were analyzed during heating and under hydrogen diffusion to better understand the effect of hydrogen on the material's structure.

1. High temperature proton transport in BaCe0.95Yb0.05O3 perovskite by: S. Nieto, R. Roque-
Malherbe, R. Polanco, L. Fuentes-Cobas, R.S. Katiyar.
Hydrogen seems to be a potential supply for satisfying some of the
mankind energy needs. But, for transportation, hydrogen should be
somewhere accumulated. However, hydrogen storage is difficult.
Nevertheless, if hydrogen is produced inside the vehicle, with the help of
an appropriate supply, such as water, ammonia, methanol, ethanol, it
can be developed as a commercial resource for transportation. However,
in this case, we need to clean the produced hydrogen, for example, with
hydrogen permeable perovskite based membranes. Nevertheless,
perovskite ceramic membranes have not been yet applied into industry;
since they cannot comply with some requirements for its ractical
applications as: high permeation flux, satisfactory chemical stability
under reducing atmospheres, good structural steadiness, small
expansion coefficient and other drawbacks. Perovskites are, normally,
oxides displaying similar structures, with the general formula ABO3,
where, A is a cation of largersize than B. In the perovskite structure the
A-site. Hence, the phase transitions and proton transport in
BaCe0.95Yb0.05O3 perovskite were studied by Raman spectroscopy, X-ray
diffraction and synchrotron radiation X-ray diffraction. Was
demonstrated that proton mobility in this material appears to be
intimately associated to the crystal phases of the framework host.
Therefore, in the present paper the phase transformations of the
perovskite were studied during heating and under hydrogen diffusion.
One of the objectives of the present research was to establish the expanse
across the phase fields. But, more significantly, the effect of hydrogen
diffusion on BaCe0.95Yb0.05O3 structure applying a careful structural
refining analysis was studied with the help of the Pawley and Rietveld
methods.
Time evolution of the cell volume during hydrogen absorption