Lead-free (1-$x$)SrTiO$_3$-$x$CaZrO$_3$ solid-solution ceramics ($x$ = 0.05, 0.10, 0.15, 0.20) were synthesized via the conventional solid-state route to investigate structure-microstructure-dielectric relationships. X-ray diffraction patterns of the samples confirmed single-phase formation for all compositions, forming cubic perovskite structure (space group $Pm-3m$). Raman spectra were consistent with the perovskite lattice and local vibrational features, confirming perovskite structure. SEM micrographs revealed noticeable porosity for lower CaZrO$_3$ contents ($x$ = 0.05-0.15) and a more compact morphology at higher CaZrO$_3$ content, with a slight decrease in grain size as $x$ increases... More >