Crystal structure and magnetic properties of the Ba3TeCo 3P2O14, Pb3TeCo3P 2O14, and Pb3TeCo3V 2O14 langasites

J. W. Krizan, C. De La Cruz, N. H. Andersen, R. J. Cava

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Abstract

We report the structural and magnetic characterizations of Ba 3TeCo3P2O14, Pb3TeCo 3P2O14, and Pb3TeCo 3V2O14, compounds that are based on the mineral dugganite, which is isostructural to langasites. The magnetic part of the structure consists of layers of Co2+ triangles. Nuclear and magnetic structures were determined through a co-refinement of synchrotron and neutron powder diffraction data. In contrast to the undistorted P321 langasite structure of Ba3TeCo3P2O14, a complex structural distortion yielding a large supercell is found for both Pb 3TeCo3P2O14 and Pb 3TeCo3V2O14. Comparison of the three compounds studied along with the zinc analog Pb3TeZn 3P2O14, also characterized here, suggests that the distortion is driven by Pb2+ lone pairs; as such, the Pb compounds crystallize in a pyroelectric space group, P2. Magnetic susceptibility, magnetization, and heat capacity measurements were performed to characterize the magnetic behavior. All three compounds become antiferromagnetic with Néel temperatures Tn≈21 K (Ba3TeCo 3P2O14), ≈13 K (Pb3TeCo 3P2O14), and ≈8 K (Pb3TeCo 3V2O14), and they exhibit magnetic transitions at high applied magnetic fields, suggesting intrinsically complex magnetic behavior for tetrahedrally coordinated d7 Co2+ in this structure type.

Original languageEnglish (US)
Pages (from-to)310-320
Number of pages11
JournalJournal of Solid State Chemistry
Volume203
DOIs
StatePublished - Jan 1 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Keywords

  • Dugganite
  • Frustrated magnetism
  • Langasite
  • Magnetic structure
  • Neutron diffraction
  • Rietveld co-refinement

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