Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
Inorg Chem. 2010 Nov 15;49(22):10415-21. doi: 10.1021/ic1018482. Epub 2010 Oct 19.
A series of samples with composition Gd(2-y)Ce(y)Zr(2)O(7) (0.0 ≤ y ≤ 2.0) were prepared by the gel combustion method followed by high-temperature reduction. The details of the structural variations as a function of the composition, temperature, and oxygen stoichiometry have been investigated by X-ray diffraction (XRD), high-temperature XRD (HT-XRD), and thermogravimetry. A complete solubility of Gd(3+) in Ce(2)Zr(2)O(7) and Ce(2)Zr(2)O(8) could be achieved by this adaptive preparative method. Analysis of the XRD data revealed a sequential variation of the structural features with oxygen stoichiometry as well as Gd(3+) contents in these compositions. The variation in the unit cell parameter along the compositions has a strong influence on the oxygen uptake behavior in the Gd(2-y)Ce(y)Zr(2)O(7) system, as observed from the thermogravimetric and HT-XRD studies. The preparation and stability of various metastable phases in Gd-Ce-Zr-O have been addressed in detail. The details of the study will be useful for the design and application of a potential redox catalyst and an oxygen storage capacitor.
采用凝胶燃烧法并结合高温还原法制备了一系列组成式为 Gd(2-y)Ce(y)Zr(2)O(7)（0.0≤y≤2.0）的样品。通过 X 射线衍射（XRD）、高温 X 射线衍射（HT-XRD）和热重分析研究了结构随组成、温度和氧化学计量比的变化细节。通过这种适应性的制备方法，可以实现 Gd(3+)在 Ce(2)Zr(2)O(7)和 Ce(2)Zr(2)O(8)中的完全溶解度。XRD 数据分析表明，结构特征随氧化学计量比以及这些组成中 Gd(3+)含量的顺序变化。从热重和 HT-XRD 研究中可以看出，沿组成的单元参数变化对 Gd(2-y)Ce(y)Zr(2)O(7)体系中的氧吸收行为有很大影响。详细讨论了 Gd-Ce-Zr-O 中各种亚稳相的制备和稳定性。该研究的细节对于设计和应用潜在的氧化还原催化剂和氧储存电容器非常有用。
