Synthesis and formation mechanism of titanium lead carbide
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Ti2PbC was synthesized for the first time by pressureless reaction synthesis using Ti/Pb/TiC as starting materials at a heating rate of 2 °C/min and holding at 1370 °C for 2 h in a tube furnace protected by Ar atmosphere. The effects of starting powders, heating rates, and holding temperatures on the formation of Ti2PbC were investigated. It was found that elementary mixture of Ti/Pb/C or higher heating rates fail to form Ti2PbC. The decreased lattice parameters in the synthesized Ti2PbC indicated the existence of Pb vacancies in the compound. A reaction mechanism was proposed to explain the formation of Ti2PbC.
KeywordsTi2PbC MAX phase differential scanning calorimetry (DSC) thermal stability
This research is supported by the grants from National Natural Science Foundation (Nos. 51731004, 51501038, and 51671054) and the Fundamental Research Funds for the Central Universities in China.
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