Tu, Chi-ShunChien, R. R.Schmidt, V. HugoLee, S.-C.Huang, C.-C.2019-02-082019-02-082012C.-S. Tu, R.R. Chien, V.H. Schmidt, S.C. Lee, and C.-C. Huang, “Temperature-dependent structures of proton-conducting Ba(Zr0.8-xCexY0.2)O2.9 ceramics by Raman scattering and x-ray diffraction,” Journal of Physics: Condensed Matter 24, 155403 (6 pp.) (2012), doi: 10.1088/0953-8984/24/15/155403.0953-8984https://scholarworks.montana.edu/handle/1/15228In situ temperature-dependent micro-Raman scattering and x-ray diffraction have been performed to study atomic vibration, lattice parameter and structural transition of proton-conducting Ba(Zr0.8−xCexY 0.2)O2.9 (BZCY) ceramics (x = 0.0–0.8) synthesized by the glycine–nitrate combustion process. The Raman vibrations have been identified and their frequencies increase with decreasing x as the heavier Ce4+ ions are replaced by Zr4+ ions. The main Raman vibrations of Ba(Ce0.8Y 0.2)O2.9 appear near 305, 332, 352, 440 and 635 cm−1. The X–O ( X=Ce, Zr, Y) stretching modes are sensitive to the variation of Ce/Zr ratio. A rhombohedral–cubic structural transition was observed for x = 0.5–0.8, in which the transition shifts toward higher temperature as cerium increases, except for Ba(Ce0.8Y 0.2)O2.9. A minor monoclinic phase possibly coexists in the rhombohedral matrix for x = 0.5–0.8. The lower-cerium BZCYs (x = 0.0–0.4) ceramics do not exhibit any transition in the region of 20–900 °C, indicating a cubic phase at and above room temperature.enThis Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).http://rightsstatements.org/vocab/InC/1.0/Article