Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 48: Phase Transitions V
MM 48.1: Vortrag
Freitag, 29. Februar 2008, 10:15–10:30, H 0107
Adiabatic calorimeter for the determination of thermophysical properties on a metrological basis — •Axel Pramann1, Hans-Walter Krupke1, Yosuke Moriya1,2, Steffen Rudtsch3, and Stefan Sarge1 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — 2Inst. for Solid State Physics, Univ. of Tokyo, 5-1-5 Kashiwanoha, 227-8581 Japan — 3Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, 10587 Berlin, Germany
A prototype of a new adiabatic calorimeter in the operation range of 20∘C up to 200∘C was developed at PTB. The precursor of our calorimeter has been operated at the NBS developed by West and Ginnings [1]. The calorimeter is operated in a step-wise heating mode for the determination of the enthalpy of fusion Δfush, the temperature of fusion and heat capacities of solids. First experiments on Gallium and Indium gave Δfush(Ga) = 80.130 ± 0.003 J/g and Δfush(In) = 28.658 ± 0.003 J/g. Our experiments confirm the results of Archer and Rudtsch [2, 3] - which can be considered as the currently most accurate reference values - within their given uncertainty. The technical and experimental details as well as the principle of the determination of Δfush are described on a metrological basis. A further application will be the cryoscopic purity determination of fixed-point materials in thermometry.
E. D. West, D. C. Ginnings, J. Res. Nat. Bur. Stand. 60, 309 (1958).
D. G. Archer, J. Chem. Eng. Data 47, 304 (2002).
D. G. Archer, S. Rudtsch, J. Chem. Eng. Data 48, 1157 (2003).