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Rational Phase Control in the Synthesis of Cobalt Sulfides.

Peter H Edwards1, Jeremy R Bairan Espano2, Janet E Macdonald1,2

  • 1Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, United States.

Chemistry of Materials : a Publication of the American Chemical Society
|August 19, 2024
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Summary
This summary is machine-generated.

Researchers synthesized cobalt sulfides using substituted thioureas as sulfur reagents. This method allowed for controlled decomposition kinetics, enabling the phase-pure synthesis of four natural cobalt sulfide structures.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Solid-State Chemistry

Background:

  • Cobalt sulfides exhibit diverse crystalline structures with various applications.
  • Controlling the synthesis of specific cobalt sulfide phases remains a challenge.
  • Understanding the decomposition kinetics of sulfur precursors is crucial for phase-selective synthesis.

Purpose of the Study:

  • To explore the use of substituted thioureas as sulfur reagents for cobalt sulfide synthesis.
  • To investigate the influence of thiourea substitution patterns on precursor decomposition kinetics.
  • To achieve phase-pure synthesis of naturally occurring cobalt sulfides: jaipurite (CoS), cobalt pentlandite (Co8S9), linnaeite (Co3S4), and cattierite (CoS2).

Main Methods:

  • Utilized a library of substituted thioureas as sulfur sources.
  • Investigated the decomposition kinetics of thiourea precursors.
  • Correlated decomposition rates with cobalt sulfide phase formation.
  • Analyzed the role of sulfur lattice stacking (ccp/hcp) in phase transformation pathways.

Main Results:

  • Demonstrated that thiourea substitution patterns control precursor decomposition rates.
  • Established a link between decomposition kinetics and cobalt sulfide phase formation.
  • Successfully synthesized phase-pure jaipurite (CoS), cobalt pentlandite (Co8S9), linnaeite (Co3S4), and cattierite (CoS2).
  • Provided insights into the transformation pathways governed by sulfur lattice stacking.

Conclusions:

  • Substituted thioureas are effective sulfur reagents for controlled cobalt sulfide synthesis.
  • Decomposition kinetics of sulfur precursors play a critical role in cobalt sulfide phase selection.
  • The stacking of the sulfur lattice influences the accessible transformation pathways between cobalt sulfide phases.
  • Achieved comprehensive control over the synthesis of all four naturally occurring cobalt sulfide crystalline structures.