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Phase equilibria in the system HfO2-Y2O3-La2O3 AT 1900°C

  • Physicochemical Materials Research
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Powder Metallurgy and Metal Ceramics Aims and scope

Abstract

We have used x-ray phase analysis, electron-probe microanalysis, petrography, and electron microscopy on annealed specimens to study phase equilibria in the ternary system HfO2-Y2O3-La2O3 at 1900 °C over the entire concentration range. We have plotted the isothermal cross section of the phase diagram for this system at the indicated temperature. We found 23 phase regions. A typical feature of the system is formation of solid solutions based on different crystal modifications of the starting components (A-and H-La2O3, C-Y2O3, T-and F-HfO2) and also the compounds La2Hf2O7, LaYO3. We did not observe new phases in the system. The nature of the phase equilibria in the system is consistent with the high relative thermodynamic stability of lanthanum hafnate (ΔH °La2Hf2O7 ≈ 100 kJ/mole) compared with LaYO3. We established that adding a third component extends the thermal stability region for the ordered phase of LaYO3 toward higher temperatures.

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Authors and Affiliations

  1. Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev

    E. R. Andrievskaya, L. M. Lopato & V. P. Smirnov

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  1. E. R. Andrievskaya
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  2. L. M. Lopato
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Translated from Poroshkovaya Metallurgiya, Nos. 1–2(447), pp. 73–87, January–February, 2006.

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Andrievskaya, E.R., Lopato, L.M. & Smirnov, V.P. Phase equilibria in the system HfO2-Y2O3-La2O3 AT 1900°C. Powder Metall Met Ceram 45, 59–71 (2006). https://doi.org/10.1007/s11106-006-0042-9

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  • DOI: https://doi.org/10.1007/s11106-006-0042-9

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