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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Electrochemistry

Background:

  • Scandium Molybdate (Sc₂(MoO₄)₃) exhibits negative thermal expansion (NTE) properties over a wide temperature range.
  • Electrochemical activation, involving ion insertion and extraction, can significantly modify the structural evolution and properties of related materials like Scandium Tungstate (Sc₂(WO₄)₃).

Purpose of the Study:

  • To investigate the effects of electrochemical activation using lithium, sodium, and potassium on the phase evolution and thermal expansion behavior of Sc₂(MoO₄)₃.
  • To compare the outcomes with those observed in structurally similar Sc₂(WO₄)₃.

Main Methods:

  • Electrochemical discharge of Sc₂(MoO₄)₃ with Li, Na, and K counter electrodes to varying capacities.
  • Subsequent thermal treatment of the electrochemically activated electrodes.
  • Analysis of phase formation and structural changes using techniques not explicitly stated but implied by the results.

Main Results:

  • Lithium-discharged Sc₂(MoO₄)₃ showed enhanced negative thermal expansion (CTE of -13.83(1) × 10⁻⁶/°C) and formed Li₂MoO₂ and Li₂MoO₄ phases.
  • Further lithium discharge and thermal treatment led to the formation of Li₃ScMo₃O₁₂.
  • Sodium and potassium discharge followed by thermal treatment resulted in the formation of new phases, including Na₀.₉Mo₂O₄, KMo₄O₆, and K₂MoO₄.

Conclusions:

  • Electrochemical activation of Sc₂(MoO₄)₃ with alkali metals provides a pathway to access a rich diversity of new phases.
  • These novel phases exhibit distinct thermal expansion characteristics, offering potential for advanced material applications.
  • The study highlights the versatility of electrochemical methods in tailoring the properties of Sc₂(MoO₄)₃.