碳化物
化学
金属
氧化物
纳米复合材料
固溶体
固态
柠檬酸
无机化学
化学工程
纳米技术
材料科学
物理化学
有机化学
工程类
作者
Pavlína Šolcová,Matěj Nižňanský,Jiří Schulz,Petr Brázda,Petra Ecorchard,Monika Vilémová,Václav Tyrpekl
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2021-05-24
卷期号:60 (11): 7617-7621
被引量:9
标识
DOI:10.1021/acs.inorgchem.1c00776
摘要
High-entropy ceramics is a new class of materials having a great potential and wide application. The carbide of Ti, Zr, Hf, Ta, Nb is a typical member of this group. It has been synthesized mostly through blending, milling, and high-temperature solid-state reaction of metal carbide precursors for each metal. This route needs extremely high temperature (2300 °C), which makes it energy and technology demanding. We have developed a chemical route for high-entropy carbide powder that needs a synthetic temperature that is several hundred degrees Celsius lower. A solution of desired metal citrates with an excess of citric acid was converted into a metal oxide/active carbon nanocomposite. Starting from a solution enabled ideal mixing of precursors on a molecular level, allowing us to skip any milling and blending steps. The nanocomposite was treated in vacuum at 1600 °C, giving a phase-pure high-entropy carbide. The intermediate compounds and products were characterized by means of solid-state analysis.
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