HTHP 51.2, p. 145-164

HTHP Home • Issue Contents • Forthcoming Papers

Molar heat capacity of liquid Ti, Al₂₀Ti₈₀ and Al₅₀Ti₅₀ measured in electromagnetic levitation
Juergen Brillo, Johanna J. Wessing, Hidekazu Kobatake and Hiroyuki Fukuyama

Temperature dependent isobaric molar heat capacity 𝐶_𝑃 was measured in a containerless way for liquid Ti and two AlTi binary liquid alloys. The technique of electromagnetic levitation was used in combination with laser modulation calorimetry.

In all cases, linear temperature dependencies were found: At the corresponding liquidus temperatures, 𝐶_𝑃 equals 49.75(±2.0) J∙K^-1mol^-1, 57.43(±2.9) J∙K^-1mol^-1, and 42.60(±2.2) J∙K^-1mol^-1, for Ti, Al₂₀Ti₈₀ and Al₅₀Ti₅₀, respectively. The respective temperature coefficients amount to -1.67∙10^-2J∙K^-2mol^-1, -2.73∙10^-2J∙K^-2mol^-1, and +7.83∙10^-2J∙K^-2mol^-1. For liquid Ti, there is a good agreement with existing literature data. The results are discussed in relation to the Neumann-Kopp rule.

Keywords: Al-Ti liquid alloys, electromagnetic levitation, molar heat capacity, normal spectral emissivity, thermophysical properties

Full Text (IP)
DOI: 10.32908/hthp.v51.1169