Phase Relations and Elemental Distributions in the Ceramics of the Pseudo-Binary Systems CaZrTi{sub 2}O{sub 7} - LnAlO{sub 3} (Ln = Eu, Gd)
- SIA Radon, Moscow (Russian Federation)
- D. Mendeleev Univ. of Chemical Technology (Russian Federation)
- IGEM RAS, Moscow (Russian Federation)
Zirconolite and perovskite were found to be major and minor phases respectively in the ceramics of the series (1-x) CaZrTi2O{sub 7} - x EuAlO{sub 3} and (1-x) CaZrTi{sub 2}O{sub 7} - x GdAlO{sub 3} (x = 0.25; 0.5; 0.75) produced by cold pressing and sintering at 1400, 1450 and 1500 deg. C. Zirconolite and cubic fianite-type oxide (in the Eu-bearing ceramics) were extra phases. At x = 0.25 major host phase for Eu and Gd is zirconolite accumulating of up to 90% of total Eu and Gd. With increase x value to 0.5 zirconolite remains major host phase for both Eu and Gd and accommodates almost 70% of total Eu{sub 2}O{sub 3} and about 60% of total Gd{sub 2}O{sub 3}. Perovskite becomes major phase for both Eu{sub 2}O{sub 3} and Gd{sub 2}O{sub 3} at x = 0.75 accumulating of about 66% of total Gd{sub 2}O{sub 3}. As follows from SEM/EDS data Eu and Gd contents in the zirconolite may exceed {approx}1 formula units, therefore, zirconolite ceramics may be effective matrices for actinide fraction of HLW where Am and Cm are dominant because their crystal chemical behavior is similar to behavior of Gd. (authors)
- Research Organization:
- WM Symposia, 1628 E. Southern Avenue, Suite 9 - 332, Tempe, AZ 85282 (United States)
- OSTI ID:
- 21294730
- Report Number(s):
- INIS-US--09-WM-07380
- Country of Publication:
- United States
- Language:
- English
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