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Formation of diffusionlessly transformed tetragonal phases by rapid quenching of melts in ZrO2-RO1.5 systems (R = rare earths)

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Abstract

Rare-earth (Nd, Sm, Er, Yb, Sc)-doped zirconia was melted using an arc-imaging furnace, and rapidly quenched with a hammer and anvil apparatus (cooling rate >105 K sec−1). These ZrO2-RO1.5 samples were investigated by X-ray diffraction and transmission electron microscopy. The existing region of metastable tetragonal zirconia is from 2 to 14 mol% of RO1.5 regardless of the species of dopants, RO1.5. In the lattice parameters of the tetragonal phases, the unit cell volume corresponds to the ionic radii of dopants, whereas the tetragonality (c/a) is independent of the species of dopants, but dependent on the content of dopants.

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Authors and Affiliations

  1. Research Laboratory of Engineering Materials, Tokyo Institute of Technology, Nagatsuta, Midori, 227, Yokohama, Japan

    Masahiro Yoshimura, Masatomo Yashima, Tatsuo Noma & Shigeyuki Sōmiya

Authors
  1. Masahiro Yoshimura
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  2. Masatomo Yashima
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  3. Tatsuo Noma
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  4. Shigeyuki Sōmiya
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Yoshimura, M., Yashima, M., Noma, T. et al. Formation of diffusionlessly transformed tetragonal phases by rapid quenching of melts in ZrO2-RO1.5 systems (R = rare earths). J Mater Sci 25, 2011–2016 (1990). https://doi.org/10.1007/BF01045757

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