Self-propagating room temperature synthesis and structural characterization of transition metal-rare earth based compositionally complex oxides

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS Open Ceramics Pub Date : 2024-11-19 DOI:10.1016/j.oceram.2024.100711

Muthukumar Abishek , Marija Prekajski Đorđević , Svetlana Butulija , Branko Matović , Ravi Kumar

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Abstract

Two compositionally complex oxides (CCOs) of the type (Hf_0.2Zr_0.2Ce_0.2Gd_0.2 RE_0.2)O_2-δ, were synthesized via self-propagating room temperature synthesis where RE=Yb for one of the two, while in the other case, Yb was replaced by equal concentrations of Pr and Nd. Heat-treatment at varied temperatures between 900 °C – 1500 °C and phase evolution studies revealed the formation of a single phase with a FCC structure with the Yb containing oxide. However, the substitution of Yb with Pr and Nd resulted in an additional secondary FCC phase. Furthermore, Raman spectroscopy confirmed pyrochlore-type ordering in both compounds with exemplification of superlattice planes in high-resolution transmission electron microscopic images. The presence of 3+ and 4+ cations confirmed by X-ray photoelectron spectroscopy, is in accordance with the results on the pyrochlore structure containing two different cationic species.

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过渡金属稀土基成分复杂氧化物的自推进室温合成及结构表征

通过自推进室温合成法合成了两种成分复杂的(Hf0.2Zr0.2Ce0.2Gd0.2 RE0.2)O2-δ型氧化物（CCOs），其中一种的 RE=Yb 值为 1，而另一种的 Yb 值则被等浓度的 Pr 和 Nd 取代。在 900 °C - 1500 °C 之间的不同温度下进行热处理和相演化研究发现，含镱氧化物形成了具有 FCC 结构的单相。然而，用镨和钕取代镱后，又形成了一个二级 FCC 相。此外，拉曼光谱证实了这两种化合物中的火成晶型有序性，并在高分辨率透射电子显微镜图像中显示了超晶格平面。X 射线光电子能谱证实了 3+ 和 4+ 阳离子的存在，这与含有两种不同阳离子的热绿石结构的研究结果是一致的。

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