Anomalous temperature dependence of liquid state density for Ni₅₀Ti₅₀ alloy investigated under electrostatic levitation state

The density of liquid Ni-Ti alloys were measured by electrostatic levitation technique and the maximum reduced undercooling of ΔT/T_L reaches 0.23. Quite different from the linear relationship between density and temperature for liquid Ni₄₅Ti₅₅ and Ni₅₅Ti₄₅ alloys, the density of liquid Ni₅₀Ti₅₀ alloy displays a nonlinear dependence on temperature. Interestingly, the density increasing tendency of liquid Ni₅₀Ti₅₀ alloy rises more rapidly with the decrease of temperature, which results from the more severe shrinking of the distance among atoms at lower temperatures. In addition, the thermal expansion coefficient of liquid Ni₅₀Ti₅₀ alloy increases linearly with the decrease of temperature.