Jpn. J. Appl. Phys. 43 (2004) pp. 1496-1500  |Previous Article| |Next Article|  |Table of Contents|
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Non-Contact Thermophysical Property Measurements of Liquid and Undercooled Alumina

Paul-Francois Paradis, Takehiko Ishikawa, Yutaka Saita1 and Shinichi Yoda

National Space Development Agency of Japan, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan
1Advanced Engineering Service Co. Ltd., 1-6-1 Takezono, Tsukuba, Ibaraki 305-0032, Japan

(Received August 18, 2003; accepted December 15, 2003; published April 9, 2004)

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-Tm) (kg·m-3) with Tm=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 CP(T)=153.5+3.1×10-3(T-Tm) (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.

DOI: 10.1143/JJAP.43.1496
KEYWORDS:alumina, density, heat capacity, levitation, liquid, undercooling

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