La 4 Cu 3 MoO 12: A novel cuprate with unusual magnetism

Douglas A. Vander Griend, Sophie Boudin, Vincent Caignaert, Kenneth Poeppelmeier*, Yanguo Wang, Vinayak P Dravid, Masaki Azuma, Mikio Takano, Zhongbo Hu, James D. Jorgensen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

La 4 Cu 3 MoO 12 is a new (ABO 3 )(n=4) cuprate with mixed B-cations in a ratio of 1:3. When synthesized at ambient pressure, the structure is not perovskite as expected but rather a homeotype of YAlO 3 , a rare-earth hexagonal phase. While the P6 3 /mmc and Pmnm space groups can be used to model average structures which appear in quenched samples; powder, electron, and neutron diffraction data all confirm that a slow-cooled sample crystallizes in the monoclinic space group, P112 1 /m. The copper and molybdenum are coordinated by oxygen in corner-sharing trigonal bipyramids that are sandwiched between layers of lanthanum cations. In the B-cation layer, the copper cations order into a kagome-like lattice of triangular clusters. The magnetism has been measured from 2 to 800 K and is highly influenced by the geometric arrangement of the Cu(II) cations. An antiferromagnetic transition occurs at 5 K, but the sample does not reach a purely paramagnetic state until 460 K.

Original languageEnglish (US)
Pages (from-to)4787-4792
Number of pages6
JournalJournal of the American Chemical Society
Volume121
Issue number20
DOIs
StatePublished - May 26 1999

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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