Abstract
From the characterization of a series compositions with general stoichiometry as Ca 1− x Zr 1− x Sm 2 x Ti 2 O 7 (0.00 ≤ x ≤ 1.00), the phase evolution between zirconolite (CaZrTi 2 O 7 ) and pyrochlore type Sm 2 Ti 2 O 7 has been elucidated. All the compositions were prepared by high temperature solid state reaction and characterized by powder X-ray diffraction (XRD) and electron probe for microanalyses (EPMA). Three major phase fields, namely two layer (2-M) or four layer (4-M) monoclinic zirconolite and cubic pyrochlore structure types were observed in this system. In addition, a feeble amount of perovskite type phase is found to coexist with zirconolite phase. 4-M zirconolite phase is observed as single phase field at the composition with x = 0.30 and 0.35, while cubic pyrochlore phase is observed as single phase at the compositions with x ≥ 0.60. Further, the composition and microstructure of coexisting phases are verified by back scattered electron image and EPMA studies.
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