Hydrogen-induced phase transition in barium cerate
Yu. M. BaǐkovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg,V. M. EgorovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg,Н. Ф. КартенкоA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgB. A. -T. MelekhA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgYu. P. StepanovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgYu. N. FilinA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg,
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The action of water vapor on nominally pure BaCeO3 perovskite at 850 K causes hydrogen to be incorporated into the lattice and a thermally metastable state to form. The lattice symmetry changes as a result of an orthorhombic-pseudocubic transition which takes place at a temperature substantially lower than the known thermally initiated rhombohedral-cubic transition at 1173 K.
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