Graduate Institute of Applied Science and Engineering, Fu Jen Catholic University, Taipei 24205, Taiwan.
J Phys Condens Matter. 2012 Apr 18;24(15):155403. doi: 10.1088/0953-8984/24/15/155403. Epub 2012 Mar 22.
In 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(Zr(0.8-x)Ce(x)Y(0.2))O(2.9) (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 Ce(4+) ions are replaced by Zr(4+) ions. The main Raman vibrations of Ba(Ce(0.8)Y (0.2))O(2.9) 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(Ce(0.8)Y(0.2))O(2.9). 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.
采用原位温度依赖的微拉曼散射和 X 射线衍射研究了质子导体 Ba(Zr(0.8-x)Ce(x)Y(0.2))O(2.9)（BZCY）（x=0.0-0.8）陶瓷的原子振动、晶格参数和结构转变，该陶瓷通过甘氨酸-硝酸盐燃烧法合成。已经鉴定了 Raman 振动，并且随着较重的 Ce(4+)离子被 Zr(4+)离子取代，它们的频率随着 x 的减小而增加。Ba(Ce(0.8)Y(0.2))O(2.9)的主要 Raman 振动出现在 305、332、352、440 和 635 cm(-1)附近。X-O（X=Ce、Zr、Y）伸缩模式对 Ce/Zr 比值的变化很敏感。在 x=0.5-0.8 范围内观察到菱方-立方结构转变，其中随着铈的增加，转变向高温移动，除了 Ba(Ce(0.8)Y(0.2))O(2.9)。在 x=0.5-0.8 范围内，菱方基质中可能存在少量的单斜相共存。较低铈的 BZCYs（x=0.0-0.4）陶瓷在 20-900°C 范围内没有任何转变，表明在室温及以上为立方相。
