Structural studies of CaAl12 O19, SrAl12O19, la2/3+δ Al12-δ O19, and CaAl10 NiTiO19with the hibonite structure; indications of an unusual type of ferroelectricity

Jun Li, Elena A. Medina, Judith K. Stalick, Arthur W. Sleight*, M. A. Subramanian

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

Various oxides with the hibonite structure were synthesized and structurally analyzed using powder neutron diffraction. The structure of CaAl12O19 at 298 and 11 K shows dipoles that are apparently too dilute to order unless subjected to a suitable electric field. Magnetoplumbites, such as BaFe12O19, are isostructural with hibonite. These compounds possess ferromagnetic properties, which combined with the electric dipoles may influence multiferroic behavior. Our SrAl12O19 sample showed two distinct hexagonal phases, a major phase with the normal hibonite structure and a minor phase having a closely related structure. Our sample of the defect hibonite phase La2/3+δ Al12-δ O19 shows a distinctly higher δ value (0.25) vs. that reported (∼0.15) for samples made from the melt. Finally, we used to advantage the negative scattering length of Ti to determine the site occupancies of Ni and Ti in CaAl10 NiTiO19.

Original languageEnglish
Pages (from-to)475-484
Number of pages10
JournalZEITSCHRIFT FUR NATURFORSCHUNG SECTION B: A JOURNAL OF CHEMICAL SCIENCES
Volume71
Issue number5
DOIs
Publication statusPublished - 1 May 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • Crystal structure
  • Ferroelectricity
  • Hibonite
  • Neutron diffraction
  • Oxides

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