Surface tension and specific heat of liquid Ni70.2Si29.8 alloy

The surface tension and specific heat of stable and metastable liquid Ni_70.2Si_29.8 eutectic alloy were measured by electromagnetic levitation oscillating drop method and drop calorimetry. The surface tension depends on temperature linearly within the experimental undercooling regime of 0–182 K (0.12 T_E). Its value is 1.693 N-m⁻¹ at the eutectic temperature of 1488 K, and the temperature coefficient is-4.23×10⁻⁴ N-m⁻¹.K⁻¹. For the specific heat measurement, the maximum undercooling is up to 253 K (0.17 T_E). The specific heat is determined as a polynomial function of temperature in the experimental temperature regime. On the basis of the measured data of surface tension and specific heat, the temperature-dependent density, excess volume and sound speed of liquid Ni_70.2Si_29.8 alloy are predicted theoretically.