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Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS
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Pyrite formation via kinetic intermediates through low-temperature solid-state metathesis.

Andrew J Martinolich1, James R Neilson

  • 1Department of Chemistry, Colorado State University , Fort Collins, Colorado 80523-1872, United States.

Journal of the American Chemical Society
|October 15, 2014
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Summary

Synthesizing transition metal sulfides like pyrite (FeS2) is challenging. This study reveals a low-temperature metathesis pathway involving intermediate phases, enabling materials by design.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Inorganic Synthesis

Background:

  • Synthesizing materials with kinetic barriers and limited phase stability is difficult.
  • Solid-state metathesis reactions are often too fast to study due to self-heating.
  • Understanding reaction pathways is crucial for controlled material synthesis.

Purpose of the Study:

  • To investigate the low-temperature formation pathways of transition metal disulfides (e.g., FeS2, CoS2, NiS2) via solid-state metathesis.
  • To elucidate the reaction mechanism beyond simple ion exchange.
  • To explore the potential of low-temperature metathesis for materials by design.

Main Methods:

  • Stoichiometric reaction of MCl2 salts (M = Mn, Fe, Co, Ni, Cu, Zn) with sodium disulfide (Na2S2) at 250-350 °C.
  • High-resolution synchrotron X-ray diffraction to analyze phase formation.
  • Differential scanning calorimetry to study thermal behavior and reaction energetics.

Main Results:

  • Formation of pyrite (FeS2), CoS2, and NiS2 at low temperatures.
  • Identified reaction pathway involves polyanionic disproportionation and formation of a low-density alkali-rich intermediate.
  • Energetic driving force arises from intermediate and final phase formation, not just NaCl byproduct.

Conclusions:

  • The reaction proceeds through a complex mechanism involving intermediate phases, not a simple ion exchange.
  • Low-temperature solid-state metathesis can be controlled to synthesize materials like pyrite.
  • This understanding facilitates the rational design and synthesis of novel materials.