کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1474292 | 991084 | 2014 | 9 صفحه PDF | دانلود رایگان |
From the characterization of a series compositions with general stoichiometry as Ca1−xZr1−xSm2xTi2O7 (0.00 ≤ x ≤ 1.00), the phase evolution between zirconolite (CaZrTi2O7) and pyrochlore type Sm2Ti2O7 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.
Journal: Journal of the European Ceramic Society - Volume 34, Issue 16, December 2014, Pages 4373–4381