Dicobalt (II) hydroxo-selenite: Hydrothermal synthesis, crystal structure and magnetic properties of Co2SeO3(OH)2

Ruidan Zhong, Shu Guo, Danrui Ni, R. J. Cava

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1 Scopus citations

Abstract

A previously unreported dicobalt hydroxo-selenite Co2SeO3(OH)2 was synthesized under mild hydrothermal conditions. Its crystal structure, determined by single-crystal X-ray diffraction at ambient temperature, is monoclinic, space group P21/n, with unit cell parameters a ​= ​7.716 ​Å, b ​= ​5.823 ​Å, c ​= ​9.556 ​Å, β ​= ​97.38°, and Z ​= ​4. Bond valence sums indicate that the cations have the oxidation states Co(II) and Se(IV), and allow us to locate the hydrogens in the structure. Chains of edge-sharing CoO6 octahedra extending along [010] are connected by pairs of edge sharing CoO6 octahedra, forming a two-dimensional Co-based magnetic plane. These magnetic planes are connected by two SeO3 2− pyramids. The magnetic properties of the Co2+ ions are dominated by antiferromagnetic interactions, evident by the negative Curie-Weiss temperature of −97.6 ​K. Long-range ordered antiferromagnetic ordering is observed below a transition temperature at 65 ​K.

Original languageEnglish (US)
Article number121250
JournalJournal of Solid State Chemistry
Volume285
DOIs
StatePublished - May 2020

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

  • Crystal structure
  • Hydrothermal synthesis
  • Hydroxo-selenite
  • Magnetic properties
  • Single crystal X-ray diffraction
  • Transition metal

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