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2D-3D transition in Cu-TiS2 system.

E G Shkvarina1, A A Titov1, A A Doroschek2

  • 1Institute of Metal Physics, Russian Academy of Sciences-Ural Division, 620990 Yekaterinburg, Russia.

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Summary
This summary is machine-generated.

The phase diagram of copper-titanium disulfide (Cu-TiS2) intercalation compounds was studied. Copper atom distribution between crystal sites dictates phase stability, influencing transitions between layered and cubic structures with temperature.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Crystallography

Background:

  • Understanding phase transitions in intercalation compounds is crucial for materials design.
  • Copper-titanium disulfide (Cu-TiS2) exhibits complex structural behavior upon copper intercalation.

Purpose of the Study:

  • To investigate the phase diagram of the quasi-binary Cu-TiS2 system for the first time.
  • To elucidate the relationship between copper atom distribution and phase stability in Cu-TiS2.

Main Methods:

  • In situ X-ray diffraction (XRD) was employed to study phase transitions.
  • The study covered a temperature range of 20-1000 °C and copper concentrations (x) from 0 to 0.5.

Main Results:

  • Phase transitions between 2D (layered) and 3D (cubic spinel) phases were observed.
  • Layered phase stability is governed by copper atom distribution in octahedral and tetrahedral sites.
  • Heating initially limits tetrahedral site occupation, favoring spinel formation, but further heating allows redistribution and re-stabilizes the layered phase.

Conclusions:

  • The stability of the layered Cu-TiS2 phase is dynamically controlled by copper atom site occupancy.
  • Temperature-induced changes in copper distribution drive reversible phase transitions between layered and cubic spinel structures.