Phase evolution from CaZrTi₂O₇ (zirconolite) to Y₂Ti₂O₇ (pyrochlore) have been delineated by systematic characterization of a series of sample with composition as Ca_1-xZr_1-xY_2xTi₂O₇ (0.00≤ x≤ 1.00) by powder XRD, Raman spectroscopy, SEM and EDS analyses. Comparative analyses of XRD and Raman spectra revealed sequential evolution of phases with increasing concentration of Y³⁺ in the compositions. From the XRD studies, three distinct phase fields, namely two layer (2M) and four layer (4M) zirconolitetypes and cubic pyrochlore-type are observed in between zirconolite (CaZrTi₂O₇) and Y₂Ti₂O₇. 4M-zirconolite phase is observed in a narrow range of composition, viz. 0.35 ≤ x ≤ 0.40 while cubic pyrochlore type phase is observed in the compositions with x ≥ 1.20. The unit cell volume of different phases shows a non-linear increasing trend with Y³⁺ ion concentration which has been attributed to the distribution of cations in different structure and change in their coordination number.