Doped perovskite materials exhibiting temperature independent conductivity has gained enormous attention for high temperature oxygen sensors due to great advantage over traditional doped metal oxides. This report focused on effect of sintering temperature on structure, morphology to explore correlation between oxygen sensing response of Ba(Fe0.7Ta0.3)O3-δ (BFTO30) bulk ceramics with structural and morphological features. Conventional solid-state reaction was used to synthesize BFTO30 powders. Crystal symmetry and phase purity of calcined and sintered powders was confirmed through X-ray diffraction analysis. Calcination of homogenous mixed precursors confirms that a single-phase perovskite phase without any secondary phases was obtained at 1150 °C. Samples were sintered at different temperatures (1200 °C, 1250 °C, 1300 °C, 1350 °C), X-ray diffraction of sintered samples reveals that there is a clear structural transformation from low symmetry rhombohedral phase to high symmetry cubic phase with temperature. Sintered samples exhibit porous morphological features with samples sintered at ≤1300 °C, whereas samples sintered at 1350 °C exhibits dense morphology with nearly spherical grains.