期刊
CERAMICS INTERNATIONAL
卷 49, 期 10, 页码 15544-15552出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2023.01.142
关键词
High-entropy oxide; Rock salt structure; Mechanochemical synthesis; Hydrogen
The influence of hydrogen on a HEO with a rock salt structure was investigated. Two forms of this HEO (nanopowder and sinter) were prepared and their chemical stability was studied. The results showed that the sintered sample was stable under high-pressure hydrogenation and in an argon gas mixture containing 5 vol% hydrogen.
The influence of hydrogen on a (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O HEO with a rock salt structure was studied. Two forms of this HEO (nanopowder and sinter) were prepared via mechanochemical synthesis (MS) and additional heat treatment, respectively. The chemical stability of the synthesized samples in a pure hydrogen atmosphere was investigated using Sievert's technique. High-pressure hydrogenation at 250 degrees C had no noticeable effect on the HEO sinter. The sintered sample was chemically, structurally, and morphologically stable, as confirmed via the XRD, Raman spectroscopy, SEM, and XPS techniques. Thermogravimetric analysis (TGA) showed the sinter to be stable in an argon gas mixture with 5 vol% of hydrogen and over the temperature range of up to 400 degrees C.
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