Thermophysical properties of vanadium at high temperature measured with an electrostatic levitation furnace

Four thermophysical properties of both solid and liquid vanadium: the density, thermal expansion coefficient, molar heat capacity at constant pressure, and hemispherical total emissivity, are reported. These thermophysical properties were measured over a wide temperature range, including the undercooled state, with an electrostatic levitation furnace developed by the National Space Development Agency of Japan. Over the (l840–2240) K temperature range, the density of the liquid can be expressed as ρ(T)/( kg m −3 )=5.46·10 3 −0.49·(T−T fus )/ K with T fus =2183 K, yielding a volume expansion coefficient of the liquid α(T)=8.9·10 −5 K −1 . Similarly, over the (1700–2180) K temperature range, the density of the solid can be expressed as ρ(T)/( kg m −3 )=5.72·10 3 −0.52·(T−T fus )/ K , giving a volume expansion coefficient of the solid α(T)=9.1·10 −5 K −1 . The molar heat capacity at constant pressure of the liquid phase can be estimated as C p, m (T)/( J K −1 mol −1 )=48.78+2.75·10 −3 ( T − T fus )/K over the (l825–2225) K temperature range if the hemispherical total emissivity of the liquid phase remains constant at 0.32 over the temperature interval. Over the (1350–2180) K temperature span, the hemispherical total emissivity of the solid phase can be expressed as e T ( T )=0.38–2.52·10 −4 ·( T /K)+9.90·10 −8 ·( T 2 /K 2 ). The enthalpy of fusion has also been measured as 26.5 kJ mol −1 .