Journal
JOURNAL OF APPLIED PHYSICS
Volume 105, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3117835
Keywords
barium compounds; ceramics; ionic conductivity; pyrolysis; Raman spectra; solid-state phase transformations; thermal stability; X-ray diffraction; X-ray spectra
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Funding
- National Science Council of Taiwan [96-2112-M-030-001]
- DOE [DE-AC06-76RL01830]
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In situ x-ray diffraction spectra (25-1000 degrees C) have been measured as a function of temperature for proton-conducting Ba(Zr0.8-xCexY0.2)O-2.9 (x=0.0-0.4) ceramics in CO2 atmosphere. Atomic vibrations before and after exposure to CO2 were obtained by using the micro-Raman scattering (150-1600 cm(-1)). Ba(Zr0.8Y0.2)O-2.9 and Ba(Zr0.6Ce0.2Y0.2)O-2.9 reveal a promising thermal stability in CO2 without apparent decomposition up to 1000 degrees C. However, Ba(Zr0.5Ce0.3Y0.2)O-2.9 and Ba(Zr0.4Ce0.4Y0.2)O-2.9 exhibit thermally stable below 550 degrees C and then proceed an obvious chemical decomposition of BaCO3 and Zr0.8-xCexY0.2O2 above 550 degrees C, which were clearly evidenced by the Raman vibrations of 1057 and 466 cm(-1), respectively. A first-order orthorhombic-hexagonal structure transition was confirmed in BaCO3 in the region of 810-850 degrees C upon heating. This study suggests that the Ba(Zr0.8-xCexY0.2)O-2.9 ceramics with x <= 0.2 are promising candidates for proton-conducting applications in CO2-containing environment.
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