Structural and magnetic study of Yb3+ in the perovskites Sr2YbMO6 (M = Nb, Ta, Sb)

Fiona C. Coomer, John Campbell, Nico Giordano, Oonagh M. Collins, Edmund J. Cussen

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Abstract

The compounds Sr2YbNbO6, Sr2YbTaO6 and Sr2YbSbO6 have been prepared using solid state methods by heating pelleted reagents in air at temperatures up to 1400°C. Rietveld refinement against room temperature neutron powder diffraction data show that all three compounds crystallise with a cationordered variant of the perovskite structure in the P21/n space group. Complete cation ordering occurs between M5+ and Yb3+ over two octahedrally-coordinated sites in the structure and all compounds are stoichiometric in oxygen. The Sb-O bond lengths are similar to related perovskite compounds but differ slightly from those indicated by bond valence sums. Magnetic susceptibility data resemble Curie-Weiss paramagnetic behaviour, but can be better understood as arising from the effect of the octahedral crystal field on the 2F5/2 ground state of Yb3+ leading to a temperature dependent magnetic moment on this ion below 100 K.
Original languageEnglish
Pages (from-to)411-417
Number of pages7
JournalJournal of Solid State Chemistry
Volume221
Early online date29 Oct 2014
DOIs
Publication statusPublished - Jan 2015

Keywords

  • perovskites
  • neutron diffraction
  • rare earth ions
  • magnetic measurements
  • single ion magnetism

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