Table 1 Crystal-structural parameters of the catalysts from Rietveld refinement and the chemical titration method.
BSCF (single perovskite)NBSCF (double perovskite)NBCFM (triple perovskite)
Space groupPm3¯mPmmmP4/mmm
Phase structureCubicOrthorhombicTetragonal
Lattice parametera (Å)3.9793.8563.871
b (Å)3.9793.8273.871
c (Å)3.9797.73711.676
Unit cell volume (Å3)62.997114.174175.866
Oxygen deficiency, δ0.2340.3790.495