  In a recent work by Jiang et al. [J. Phys. Chem. Solids 67 (2006) 1531-1536],
the interrelationship between lattice constant, ionic radii and tolerance
factor of cubic perovskites has been established and an empirical equation was
obtained. However, the assumption of incorrect ionic coordination led to an
incorrect mathematical expression even though the average relative errors
between predicted and observed lattice constants of 132 materials were below
1%. Here, corrected coefficients for that empirical expression are obtained,
which would likely be useful for investigation of general perovskite materials.
