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Solid state studies on K2Ti6− xNbxFe2O16(x= 0 and 1) and lithium insertion into K2Ti6M2O16(M = Cr, Fe and Ga) and K2Ti5NbFe2O16hollandite type phases

Authors
Journal
Materials Chemistry and Physics
0254-0584
Publisher
Elsevier
Publication Date
Volume
82
Issue
3
Identifiers
DOI: 10.1016/s0254-0584(03)00343-2
Keywords
  • Inorganic Compounds
  • Chemical Synthesis
  • Electrical Properties
  • Magnetic Properties
Disciplines
  • Physics

Abstract

Abstract A new niobium-substituted hollandite K 2Ti 5NbFe 2O 16 has been synthesised for the first time. The compound is crystallised in tetragonal structure. A two to three orders change in electrical resistivity is observed with temperature as compared to the parent phase K 2Ti 6Fe 2O 16. The niobium-substituted phase shows antiferromagnetic ordering with T N=37 K at a field of 0.1 T and the antiferromagnetic ordering disappears at higher field (0.2 T) indicating field induced magnetic behaviour. The Mössbauer spectrum of K 2Ti 5NbFe 2O 16 shows majority of the Fe ions are 3+ oxidation state (96%). For the first time, we have intercalated lithium into K 2Ti 6M 2O 16 (M=Cr, Fe and Ga) and K 2Ti 5NbFe 2O 16 hollandite type phases using n-butyllithium in hexane. The estimated lithium content for all the phases are in the range 1.7–2.7 mol per formula unit.

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