Original paper

Experimental investigation of thermodynamic melting properties in the system NaCl-KCl at pressures of up to 7000 bar

Siewert, R; Büttner, H.; Rosenhauer, Matthias

Neues Jahrbuch für Mineralogie - Abhandlungen Band 172 Heft 2-3 (1998), p. 259 - 278

29 references

published: May 1, 1998

BibTeX file

ArtNo. ESP154017202007, Price: 29.00 €

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Abstract

Thermodynamic melting properties in the system NaCl-KCl, including solidus temperatures at 1 bar, liquidus temperatures at pressures up to 7000 bar, heats of fusion (Delta Hf) at 1 bar and volumes of fusion Delta Vf) from 400 to 2500 bar, have been studied. A new PVT apparatus is presented for measuring Delta Vf at high pressures. The consistency of the data is clearly demonstrated by calculating Delta Vf via the Clausius-Clapeyron equation. Modelling the liquidus temperatures up to pressures of 7000 bar using the thermodynamic approach of WALDBAUM (1969) yields the following Margules parameters of volume [cm3/mol]: WV1L = - 0.71, WV2L = - 0.79, WV1S = - 0.36, WV2S = - 0.4. The heat of fusion data at 1 bar have also been modelled using a cubic Margules term for the excess function with Delta WH1 = - 26,273 J/mol and elta WH2 = -16,584 J/mol.

Keywords

thermodynamic melting propertieshigh pressureclausius-clapeyron equation