Structure and magnetic properties of the spin-1/2-based honeycomb NaNi2BiO6-δand its hydrate NaNi2BiO6-δ·1.7H2O

Elizabeth M. Seibel, John H. Roudebush, Mazhar N. Ali, K. A. Ross, Robert Joseph Cava

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

We present the structure and magnetic properties of the honeycomb anhydrate NaNi2BiO6-δ and its monolayer hydrate NaNi2BiO6-δ·1.7H2O, synthesized by deintercalation of the layered α-NaFeO2-type honeycomb compound Na3Ni2BiO6. The anhydrate adopts ABAB-type oxygen packing and a one-layer hexagonal unit cell, whereas the hydrate adopts an oxygen packing sequence based on a three-layer rhombohedral subcell. The metal-oxide layer separations are 5.7 A˚ in the anhydrate and 7.1 A˚ in the hydrate, making the hydrate a quasi 2-D honeycomb system. The compounds were characterized through single crystal diffraction, powder X-ray diffraction, thermogravimetric analysis, and elemental analysis. Temperature-dependent magnetic susceptibility measurements show both to have negative Weiss temperatures (-18.5 and -14.6 K, respectively) and similar magnetic moments (2.21 and 2.26 μB/Ni, respectively), though the field-dependent magnetization and heat capacity data suggest subtle differences in their magnetic behavior. The magnetic moments per Ni are relatively high, which we suggest is due to the presence of a mixture of Ni2+ and Ni3+ caused by oxygen vacancies.

Original languageEnglish (US)
Pages (from-to)10989-10995
Number of pages7
JournalInorganic Chemistry
Volume53
Issue number20
DOIs
StatePublished - Oct 20 2014

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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