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
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