On the inverse perovskites M3TO (M = Ca, Sr, Yb; T = Si, Ge, Sn, Pb)

Velden, A.; Jansen, M.

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On the inverse perovskites M₃TO (M = Ca, Sr, Yb; T = Si, Ge, Sn, Pb)

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Jansen, M.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Velden, A., & Jansen, M. (2004). On the inverse perovskites M₃TO (M = Ca, Sr, Yb; T = Si, Ge, Sn, Pb). Zeitschrift für anorganische und allgemeine Chemie, 630(2), 234-238.

Cite as: https://hdl.handle.net/21.11116/0000-000E-F611-9

Abstract

Ca3SiO and seven further inverse perovskites M3TO (M = Ca, Sr, Yb; T =
Si, Ge, Sn, Pb) were prepared in iron crucibles under argon by the
reactions 6 M + TO2 + T = 2 M3TO, and 3 M+ TO = M3TO for Yb3PbO,
respectively, at temperatures between 1123 to 1173 K. The crystal
structures of all compounds were solved and refined using X-ray powder
diffraction methods. Ca3SiO, Ca3GeO, Sr3SiO, Sr3GeO, Yb3SiO and Yb3GeO
are orthorhombic perovskites (anti-GdFeO3-type, space group Pbnm, No.
62, Z = 4). They show slightly distorted corner-sharing OM6 octahedra
that are tilted with respect to their positions in the ideal perovskite
structure. The effective radii of the T4- vary significantly with M2+.
Thus, these perovskites can no longer be discussed in terms of the
hard-sphere model, and Goldschmidt's tolerance factor does not apply.
The ideal cubic representatives Yb3SnO and Yb3PbO were refined in space
group Pm (3) over barm (anti-SrTiO3 type, Z = 1).