X-ray diffraction and Raman spectroscopic investigations on CaZrTi2O7-Y2Ti2O7 system: Delineation of phase fields consisting of potential ceramic host materials

被引：46

作者：

Jafar, M. ^{[1
]}

Achary, S. N. ^{[1
]}

Salke, Niliesh P. ^{[2
]}

Sahu, A. K. ^{[3
]}

Rao, Rekha ^{[2
]}

Tyagi, A. K. ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Div Chem, Bombay 400085, Maharashtra, India

[2] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India

[3] Bhabha Atom Res Ctr, Glass & Adv Mat Div, Bombay 400085, Maharashtra, India

来源：

JOURNAL OF NUCLEAR MATERIALS | 2016年 / 475卷

关键词：

Zirconolite; Pyrochlore; Nuclear waste immobilization; SYNROC; Phase relation; SOLID-SOLUTION; ZIRCONOLITE; PYROCHLORE; IRRADIATION; CRYSTALLIZATION; TRANSITION; EVOLUTION; MONAZITE; GLASSES; URANIUM;

D O I：

10.1016/j.jnucmat.2016.04.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Phase evolution from CaZrTi2O7 (zirconolite) to Y2Ti2O7 (pyrochlore) have been delineated by systematic characterization of a series of sample with composition as Ca1-xZr1-xY2xTi2O7 (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. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：192 / 199

页数：8

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