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Phase Relations in the ZrO2-Nd2O3-Y2O3 System: Experimental Study and Advanced Thermodynamic Modeling

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Abstract

Phase equilibria in the ZrO2-Nd2O3-Y2O3 system at 1523-1873 K have been investigated by x-ray diffraction (XRD) and scanning electron microscopy combined with energy dispersive x-ray spectroscopy (SEM/EDX). Temperatures of phase transformations were determined by differential thermal analysis. Temperatures of invariant reactions in the ZrO2-Nd2O3 system F = A + Pyr and H = F + A were determined as 1763 and 2118 K respectively and thermodynamic parameters of phases were re-assessed. Phase transformations in ternary systems were determined at 1732 K for composition ZrO2-48.46Nd2O3-5.38Y2O3 (mol%) and at 1744 and 1881 K for composition ZrO2-79.09Nd2O3-2.75Y2O3 (mol%). They were interpreted using XRD investigation before and after DTA as Pyr + B → F, Pyr → F and A → B, respectively. The solubility of the Y2O3 in pyrochlore phase was found to exceed 10 mol%. The thermodynamic parameters of the ZrO2-Nd2O3-Y2O3 system were reassessed taking into account solubility of Y2O3 in the Nd2Zr2O7 pyrochlore phase (Pyr). It is assumed that Y3+ substitutes Nd3+ and Zr4+ in their preferentially occupied sublattices. Ternary parameter was introduced into fluorite phase (F) for better reproducing of phase equilibria. Mixing parameters were reassessed for phase A (Nd2O3 based solution), monoclinic phase B and cubic phase C (Y2O3 based solution). The isothermal sections calculated for the ZrO2-Nd2O3-Y2O3 system are in the reasonable agreement with experimental results.

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Acknowledgment

This study was financially supported by DFG project SE 647/9-1.

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Author notes

  1. Hans J. Seifert

    Present address: Institute of Applied Materials, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany

Authors and Affiliations

  1. Institute of Materials Science, Technical University of Freiberg, Freiberg, Germany

    Olga Fabrichnaya, Galina Savinykh, Gerhard Schreiber & Hans J. Seifert

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  1. Olga Fabrichnaya
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  2. Galina Savinykh
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Correspondence to Olga Fabrichnaya.

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Fabrichnaya, O., Savinykh, G., Schreiber, G. et al. Phase Relations in the ZrO2-Nd2O3-Y2O3 System: Experimental Study and Advanced Thermodynamic Modeling. J. Phase Equilib. Diffus. 32, 284–297 (2011). https://doi.org/10.1007/s11669-011-9903-0

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  • DOI: https://doi.org/10.1007/s11669-011-9903-0

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