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Influence of composition on the T→M transformation in the systems ZrO2-Ln2O3 (Ln=La, Nd, Sm, Eu)

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Abstract

The systems ZrO2-Ln2O3 have been studied on samples annealed at 600,1170,1450°C in the 0–15 mol % Ln2O3 (where Ln is the rare-earth La, Nd, Sm or Er) range using X-ray diffraction, thermal analysis and dilatometry. The microstructure of annealed samples was examined mainly by electron microscopy. It was found that rare-earth oxides-doped zirconia formed monoclinic, tetragonal, cubic and pyrochlore-type phases. The existing region of the tetragonal phase is 1–15 mol % Ln2O3, which is independent of the species but dependent on the dopant content and temperature. The equilibrium phase diagrams and non-equilibrium diagrams have been deduced. The temperature and composition of eutectoid ZrO2,ss (T)→ZrO2,ss (M) + Py, as well as interconnection between grain size, Ln2O3 content and the martensitic transformation temperature, (M s), were determined.

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  1. Institute of Materials Science Problems, Krzhizhanovsky Str. 3, 252680, Kiev, Ukraine

    E. R. Andrievskaya & L. M. Lopato

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  1. E. R. Andrievskaya
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  2. L. M. Lopato
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Andrievskaya, E.R., Lopato, L.M. Influence of composition on the T→M transformation in the systems ZrO2-Ln2O3 (Ln=La, Nd, Sm, Eu). J Mater Sci 30, 2591–2596 (1995). https://doi.org/10.1007/BF00362139

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  • DOI: https://doi.org/10.1007/BF00362139

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