Thermal Expansion of Iridium at High Temperatures

The linear thermal expansion of iridium was measured in the range 891–2221 °C. The following equation was found to fit selected earlier results and the present results over the temperature range 30–2221 °C: $${\text{100(L}}_t{\mathrm{-L}}_0{\mathrm{)/L}}_0{\text{=616.7×10}}^{\text{−6}}{\text{t+151.9×10}}^{\text{−9}}{t}^2{\text{−28.16×10}}^{\text{−12}}{t}^3{\text{+14.63×10}}^{\text{−15}}{t}^4$$ for t expressed in °C. Thermal expansion coefficients and average coefficients of expansion were calculated.