Synthesis of the new layered oxides NaRbLnMO{sub 5} (Ln = La, Nd, Sm, Eu, Gd; M = Nb, Ta)

The new layered transition metal oxides NaRbLnMO{sub 5} (Ln = Nd, Sm, Eu, Gd; M = Nb, Ta) were synthesized by direct solid-state reaction. NaRbLaNbO{sub 5} crystallizes with a tetragonal unit cell [a=5.839(6) A, c=8.313(1) A] analogous to that of the related compound NaKLaNbO{sub 5}, while NaRbLaTaO...

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Bibliographic Details
Published in:Materials research bulletin 2004-07, Vol.39 (9)
Main Authors: Cavazos, Ronaldo J., Schak, Raymond E
Format: Article
Language:English
Subjects:
CHEMICAL PREPARATION
ION EXCHANGE
LANTHANUM OXIDES
LAYERS
LITHIUM NITRATES
MANGANESE OXIDES
MATERIALS SCIENCE
MONOCLINIC LATTICES
RARE EARTHS
RUBIDIUM OXIDES
SODIUM OXIDES
TRANSITION ELEMENTS
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Summary:The new layered transition metal oxides NaRbLnMO{sub 5} (Ln = Nd, Sm, Eu, Gd; M = Nb, Ta) were synthesized by direct solid-state reaction. NaRbLaNbO{sub 5} crystallizes with a tetragonal unit cell [a=5.839(6) A, c=8.313(1) A] analogous to that of the related compound NaKLaNbO{sub 5}, while NaRbLaTaO{sub 5} indexes to a larger monoclinic unit cell [a=9.577(2) A, b=5.834(1) A, c=8.323(2) A, {beta}=93.00(2)]. NaRbLnNbO{sub 5} can be prepared for Ln = Nd, Sm, Eu, Gd, and NaRbLnTaO{sub 5} can be prepared for Ln = Nd, Sm. Both series of compounds show the expected decrease in unit cell volume as the size of the lanthanide decreases. NaRbLaNbO{sub 5} is also amenable to ion exchange, forming Li{sub 2-x}Rb{sub x}LaNbO{sub 5} upon reaction with molten lithium nitrate.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2004.04.014