Thermal Expansion of Some Vanadium Carbides

The thermal expansion characteristics of cubic VC_0.89, cubic VC_0.73, and hexagonal V₂C were determined between room temperature and ∼600°C by the Debye—Scherrer technique using gold as an internal standard. For the range 25° to 600°C, the average linear thermal expansion coefficients are $\text{ᾱ=7.20,ᾱ=7.68}$ , and ${ᾱ}_a\text{=6.50}$ and ${ᾱ}_c\text{=10.96}$ (all ×10⁻⁶/C°), respectively. For randomly oriented V₂C, $ᾱ$ was calculated to be about 8×10⁻⁶/C° for the same temperature range.