<p>This study explores the synthesis and structural characteristics of pristine and doped La₂Zr₂O₇ and Gd₂Zr₂O₇ with a focus on their sintering behavior. The pristine La₂Zr₂O₇ was found to stabilize in defect pyrochlore structure, which evolves toward a more ordered pyrochlore structure upon high-temperature sintering, evidenced by the appearance and sharpening of superlattice reflections with increasing temperature. The (La₀.₈Gd₀.₂)₂Zr₂O₇ sample exhibited a similar behavior; however, the ordering process is sluggish due to the presence of Gd³⁺ ions. In contrast, the Gd₂Zr₂O₇ and (La₀.₂Gd₀.₈)₂Zr₂O₇ samples were stabilized in a dual-phase structure with dominant defect fluorite structure with microdomains of pyrochlore as shown through XRD and Raman analysis. All the sintered samples displayed a stable microstructure; however, relatively finer nanocrystalline grains are observed in dual-phase Gd₂Zr₂O₇ and (La_0.2Gd_0.8)₂Zr₂O₇ samples. The combined influence of disorder-driven resistance offered by the fluorite phase and grain boundary pinning by the pyrochlore phase renders these systems highly suitable for applications demanding thermal stability and preservation of microstructural features.</p>