Table 1 Physical parameters used in the calculation of melt specific heat and hypercooling limit of BT2.

Atmosphere temperature

T₀ [K]

298

Dynamic viscosity of oxygen

η [Pa·S]

3.08 × 10^−5 46

Density of oxygen

ρ₀ [g L⁻¹]

1.325

Specific heat of oxygen

C_p [J g⁻¹ K⁻¹]

0.916⁴⁶

Thermal conductivity of oxygen

λ [W m⁻¹K⁻¹]

0.0399⁴⁶

Radius of sphere

R [m]

0.000889

Density of sphere

ρ_s [g mL⁻¹]

3.945

Emissivity

ε

0.9⁴⁷

Stefan–Boltzmann constant

σ [W m⁻² K⁻⁴]

5.67 × 10⁻⁸

Mean speed of Oxygen surrounding sample

υ [m s⁻¹]

15.82

Reynolds number

Re

1180

Planck number

Pr

0.7057

Heat-transfer coefficient

h [W m⁻² K⁻¹]

283.8

Specific heat of BT2 melt

C_p^L [J mol⁻¹ K⁻¹]

206.2(3) ± 4.2(9)

Heat of fusion

ΔH_f [KJ mol⁻¹]

81.4