Abstract
Phase equilibria in the ZrO2-Ta2O5 system were studied in the temperature range from 1673 K to 1973 K using equilibration technique and in the temperature range up to 2473 K using differential thermal analysis (DTA). Phase and chemical composition of the samples was characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive X-Ray analysis (EDX). Melting relations were studied using DTA followed by microstructure investigation by means of SEM/EDX. The eutectic reaction was determined at 1994 K and composition of 51 ± 2 mol% Ta2O5. It was found that the intermediate compound Zr6Ta2O17 melts by peritectic reaction at 2166 K. The heat capacity of this compound was measured using differential scanning calorimetry (DSC) in three temperature ranges from 100 K to 230 K, from 220 K to 570 K and from 330 K to 1295 K. Based on the obtained results and literature data thermodynamic parameters of the quasibinary ZrO2-Ta2O5 system were optimized using the CALPHAD approach.
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