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Durability of Zirconium‐Containing Ceramic Waste Forms in Water
Author(s) -
Kamizono Hiroshi,
Hayakawa Issei,
Muraoka Susumu
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb06942.x
Subject(s) - pyrochlore , leaching (pedology) , zirconium , actinide , ceramic , durability , materials science , lanthanide , zirconolite , nuclear chemistry , radioactive waste , mineralogy , inorganic chemistry , metallurgy , chemistry , ion , composite material , geology , organic chemistry , soil water , phase (matter) , soil science
The durability of three ceramic waste forms containing Zr as a constituent is examined at 90° and 150°C in HCl or deionized water. The three ceramic waste forms examined are: (A) 10‐mol%‐Y 2 O 3 ‐stabilized ZrO 2 , (B) La 2 Zr 2 O 7 with a pyrochlore structure, and (C) CaZrO 3 with a perovskite structure. Each form contains an appropriate amount of Ce, Nd, and Sr to simulate the leaching behavior of actinides, lanthanides, and alkaline‐earth fission products from highlevel nuclear waste. Two forms, (A) 10‐mol%‐Y 2 O 3 ‐stabilized ZrO 2 and (B) La 2 Zr 2 O 7 with a pyrochlore structure, show excellent durability in HCl and deionized water. For example, leach rates of all constituents in the La 2 Zr 2 O 7 waste form are less than about 10 −4 g·m −2 ·d −1 at 150°C for a leach time of 32 d in deionized water.