open access

https://hdl.handle.net/2115/76028

Studies on phase transitions of rare earth tantalates (Sm(1-x)Ln(x))(3)TaO7 (Ln = Nd, Eu) with fluorite-related structure

英語

DTA

2019-05

The Ceramic Society of Japan

Journal of the Ceramic Society of Japan

127(5)

273-278

The phase transition of Sm3TaO7 with orthorhombic fluorite-related structure was investigated. Solid solutions (Sm1-xNdx)(3)TaO7 and (Sm1-xEux)(3)TaO7 were prepared, and their structures at room temperature are well described with the space group C222(1). The phase transition temperature for (Sm1-xNdx)(3)TaO7 decreases from 1340 K with increasing Nd concentration, while that for (Sm1-xEux)(3)TaO7 increases with Eu concentration. However, both of these solid solutions show the same trend, i.e., with decreasing average rare earth radii, the phase transition temperature of (Sm(1-x)Ln(x))(3)TaO7 (Ln = Nd, Eu) increases. This trend is the same as that observed for Ln(3)MO(7) (M = Mo, Ru, Re, Os, or Ir). That is, the phase transition occurs with lattice contraction. Above the transition temperature, crystal structures for (Sm(1-x)Ln(x))(3)TaO7 (Ln = Nd, Eu) are well described with space group Pnma. (C) 2019 The Ceramic Society of Japan. All rights reserved.

学術雑誌論文

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Creative Commons Attribution-NoDerivatives 4.0 International

1882-0743