Non-Contact Thermophysical Property Measurements of Liquid and Undercooled Alumina

• DOI: 10.1143/jjap.43.1496
• Publication Date: 2005-02-10T11:25:38Z
• Authors: Paul-Francois Par...; Takehiko Ishikawa; Yutaka Saita; Shinichi Yoda
• Keywords: 02 engineering and technology; 0210 nano-technology

The density and the isobaric heat capacity of alumina in its liquid and undercooled states were measured using an electrostatic levitation furnace. Over the 2175 to 2435 K temperature interval, the density can be expressed as ρ(T)=2.93×103-0.12(T-T m) (kg·m-3) with T m=2327 K, yielding a volume expansion coefficient α(T)=4.1×10-5 (K-1). In addition, the isobaric heat capacity can be estimated as C P(T)=153.5+3.1×10-3(T-T m) (J·mol-1·K-1) if the hemispherical total emissivity of the liquid remains constant at 0.8 over the 2120 K to 2450 K interval. The enthalpy and entropy of fusion have also been calculated respectively as 109.0 kJ·mol-1 and 46.8 J·mol-1·K-1.