Revised Bi/M layered oxo-sulfate (M = Co, Cu): a structural and magnetic study
Minfeng Lü1, Marie Colmont, Houria Kabbour
1Unité de Catalyse et de Chimie du Solide (UCCS USTL), Université Lille Nord de France, UMR 8181 CNRS , F-59655 Villeneuve d'Ascq, France.
Inorganic Chemistry
|June 19, 2014
Summary
Researchers explored layered bismuth compounds with sulfate anions, discovering new structures with cobalt and copper. One compound exhibits weak ferromagnetism due to Dzyaloshinskii-Moriya interactions in cobalt chains.
Area of Science:
- Solid-state chemistry
- Materials science
- Crystallography
Background:
- Layered Sillen-related compounds are formed by combining oxo-bismuthite slabs with counter oxo-anions.
- Aliovalent cations like Bi(3+)/M(2+) are incorporated for electroneutrality within these structures.
- Previous research on sulfate-containing compounds with M = Co, Cu was limited, with some magnetic properties uncharacterized.
Purpose of the Study:
- To reinvestigate and fully characterize layered bismuth-sulfate compounds containing cobalt and copper.
- To explore the structural and magnetic properties of these novel materials.
- To synthesize and analyze new compounds formed through crystal growth in Bi2O3 flux.
Main Methods:
- Crystal growth using Bi2O3 flux.
- Full structural characterization of synthesized compounds.
- Magnetic property measurements, including susceptibility and magnetization.
Main Results:
- Two compounds, [Bi2CoO3](SO4) (I) and [Bi6.2367Cu1.6O8](SO4)3 (II), were structurally characterized, both featuring pleated [Bi/M/O] slabs in doubled cells.
- Compound (I) displays weak ferromagnetism below 17 K, attributed to Dzyaloshinskii-Moriya interactions in zigzag cobalt chains.
- Compound (II) is predominantly paramagnetic, despite the presence of copper-containing dimers.
- A novel compound, [Bi6O6](CoO2)(SO4)2 (III), was identified with ordered cobalt and sulfate ions in the interleaves, resulting in a noncentrosymmetric structure.
Conclusions:
- The study successfully synthesized and characterized novel layered bismuth-sulfate compounds.
- The findings reveal interesting magnetic behaviors in cobalt-containing compounds and highlight the structural diversity achievable.
- The research contributes to the understanding of Sillen-related structures and their potential magnetic properties.
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