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Updated: Mar 14, 2026

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
Published on: July 3, 2015
The effects of ordered carbon vacancies on stability and thermo-mechanical properties of V8C7 compared with VC
XiaoYu Chong1, YeHua Jiang1, Rong Zhou1
1Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, People's Republic of China.
Abstract:
The ordered non-stoichiometric V8C7 can form in the VCy carbides by the disorder-order phase transformation. The intrusion of ordered carbon vacancies can affect their stability, mechanical, thermal and electronic properties. The relatively thermodynamic stability and mechanical properties at high temperature for the ordered stoichiometric VC and non-stoichiometric V8C7 are investigated in this paper by first-principle calculations combined with the quasi-harmonic approximation. The difference between the properties of VC and V8C7 can be obtained. We find that the V8C7 is thermodynamic more stable than VC, but has weaker elastic heat resistance than VC. Moreover, the minimum thermal conductivity of VC is a little larger than V8C7 and a simple way is proposed to characterize the anisotropy of lattice thermal conductivity based on the Cahill's model.
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