Bond valence analysis of the cubic perovskite SnTaO₃: confirmation of its existence

Chem. Met. Alloys 6 (2013) 109-112

https://doi.org/10.30970/cma6.0244

V. SIDEY

The existence of the cubic perovskite phase SnTaO₃ has been confirmed by using the bond valence model. The bond valence analysis of the crystal structure of SnTaO₃ involved (i) evaluating the reliability of the bond valence parameters reported earlier for Sn(II)—O bonds; (ii) determining the hitherto unreported bond valence parameters for Ta(IV)—O bonds; (iii) calculating the bond valence sums for all the crystallographically different atoms in the structure; and (iv) calculating the “global instability index” of the structure. The values of the bond valence sums and “global instability index” calculated for the structure of SnTaO₃ indicate the stability of this ternary phase and the plausibility of the stoichiometric perovskite structural model proposed for SnTaO₃.

Keywords

Perovskites / Crystal structure / Bond valence model