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Thermodynamic Analysis of Pseudobinary Subsystems of the System CaO—TiO2—SiO2

I. Nerád and V. Daněk

Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava

 

E-mail: uachnera@savba.sk

Received: 18 December 2000  Accepted: 17 January 2002

Abstract: The thermodynamic model taking into account the structural behaviour of TiO2 in silicate melts was applied to describe the activities of the components in the melts and to calculate the phase diagrams of the systems CaSiO3—CaTiSiO5, CaSiO3—CaTiO3, Ca2SiO4—CaTiO3, CaTiSiO5— CaTiO3, and CaTiSiO5—TiO2. When the present TiO2 is assumed to be completely integrated in the structural network in the form of tetrahedrally coordinated units, i.e. it acts as network former, the considered thermodynamic model fits quite well both experimental liquidus curves in the systems CaSiO3—CaTiSiO5 and CaTiSiO5—CaTiO3 and the CaTiSiO5 liquidus curve in the system CaTiSiO5—TiO2. The model fails in the systems Ca2SiO4—CaTiO3 and CaSiO3—CaTiO3 as well as by the TiO2 liquidus curve in the system CaTiSiO5—TiO2. For both liquidus curves in the system Ca2SiO4—CaTiO3 and for the TiO2 liquidus curve in the system CaTiSiO5—TiO2 better fit of the experimental liquidus curves was achieved when activities were equal to mole fractions.

Full paper in Portable Document Format: 562a77.pdf

 

Chemical Papers 56 (2) 77–83 (2002)

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