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Effect of Molybdenum on the Structure and on the Crystallization of SiO 2 –Na 2 O–CaO–B 2 O 3 Glasses
Author(s) -
Caurant Daniel,
Majérus Odile,
Fadel Edward,
Lenoir Marion,
Gervais Christel,
Pinet Olivier
Publication year - 2007
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.1551-2916.2006.01467.x
Subject(s) - crystallization , molybdenum , actinide , phase (matter) , materials science , ion , caesium , crystallography , analytical chemistry (journal) , inorganic chemistry , chemistry , organic chemistry , chromatography
Crystallization of the poorly durable Na 2 MoO 4 phase able to incorporate radioactive cesium must be avoided in SiO 2 –Al 2 O 3 –B 2 O 3 –Na 2 O–CaO glasses developed for the immobilization of Mo‐rich nuclear wastes. Increasing amounts of B 2 O 3 and MoO 3 were added to a SiO 2 –Na 2 O–CaO glass, and crystallization tendency was studied. Na 2 MoO 4 crystallization tendency decreased with the increase of B 2 O 3 concentration whereas the tendency of CaMoO 4 to crystallize increased due to preferential charge compensation of BO 4 − entities by Na + ions. 29 Si MAS NMR showed that molybdenum acts as a reticulating agent in glass structure. Trivalent actinides surrogate (Nd 3+ ) were shown to enter into CaMoO 4 crystals formed in glasses.