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Pu, U, and Hf Incorporation in Gd Silicate Apatite
Author(s) -
Vance Eric R.,
Ball Clifford J.,
Begg Bruce D.,
Carter Melody L.,
Day R. Arthur,
Thorogood Gordon J.
Publication year - 2003
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.1151-2916.2003.tb03455.x
Subject(s) - apatite , silicate , oxidizing agent , sintering , solubility , rare earth , solid solution , nuclear chemistry , mineralogy , materials science , chemistry , analytical chemistry (journal) , inorganic chemistry , metallurgy , environmental chemistry , organic chemistry
Trivalent Pu can be incorporated in the silicate apatite structure to form Ca 2 Pu 8 (SiO 4 ) 6 O 2 by sintering under reducing conditions, while the incorporation of tetravalent Pu in the Ca/rare earth sites in oxidizing or neutral conditions is limited to only 0.6 formula units (f.u.). The d ‐spacings and intensities of the X‐ray pattern of hexagonally structured Ca 2 Pu 8 (SiO 4 ) 6 O 2 after firing at 1250°C are given, and the a and c lattice parameters are 0.9561 1 and 0.7028 1 nm, respectively. The respective solid solubility limits of U and Hf in Ca 2 Gd 8– x (U/Hf) x (SiO 4 ) 6 O 2 apatite samples were 0.3 and 0.2 f.u.