Synthesis of the new layered oxides NaRbLnMO5 (Ln = La, Nd, Sm, Eu, Gd; M = Nb, Ta)

Ronaldo J. Cavazos, Raymond Edward Schaak

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Abstract

The new layered transition metal oxides NaRbLnMO5 (Ln = Nd, Sm, Eu, Gd; M = Nb, Ta) were synthesized by direct solid-state reaction. NaRbLaNbO5 crystallizes with a tetragonal unit cell [a = 5.839(6)Å, c = 8.313(1)Å] analogous to that of the related compound NaKLaNbO5, while NaRbLaTaO5 indexes to a larger monoclinic unit cell [a = 9.577(2)Å, b = 5.834(1)Å, c = 8.323(2)Å, β = 93.00(2)]. NaRbLnNbO5 can be prepared for Ln = Nd, Sm, Eu, Gd, and NaRbLnTaO5 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. NaRbLaNbO5 is also amenable to ion exchange, forming Li2-xRbxLaNbO5 upon reaction with molten lithium nitrate.

Original languageEnglish (US)
Pages (from-to)1209-1214
Number of pages6
JournalMaterials Research Bulletin
Volume39
Issue number9
DOIs
StatePublished - Jul 2 2004

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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