Abstract
The phase equilibria in the ZrO2-HfO2-Ta2O5 system were studied at 1673K and 1873 K by equilibration technique and in the temperature range up to 2473K by differential thermal analysis (DTA). The phase and chemical composition of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX). Melting relations were studied by DTA followed by microstructural investigation by SEM/EDX. The composition dependence of the eutectic and peritectic temperatures was shown. The heat capacity of the (Zr,Hf)6Ta2O17 compound with different compositions was measured by differential scanning calorimetry (DSC) in three temperature ranges from 100K to 230K, from 220K to 570K, and from 330K to 1295K. Based on the obtained results and our previous thermodynamic descriptions, a database for the ternary ZrO2- HfO2-Ta2O5 system using the CALPHAD approach was created.
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