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Structural evolution under pressure of BiMnO3.

Gianluca Calestani1, Fabio Orlandi, Francesco Mezzadri

  • 1Dipartimento di Chimica, Università degli Studi di Parma , Parco Area delle Scienze 17A, I-43124 Parma, Italy.

Inorganic Chemistry
|August 1, 2014
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Summary
This summary is machine-generated.

High pressure transforms BiMnO3, revealing phase transitions and altered symmetries. The Bi(3+) lone pair plays a key role in stabilizing Jahn-Teller distortion and orbital order under pressure.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • BiMnO3 exhibits complex structural behavior under pressure.
  • Understanding these transitions is crucial for materials applications.

Purpose of the Study:

  • To quantitatively investigate the structural evolution of BiMnO3 under high pressure.
  • To elucidate the pressure-induced phase transitions and their impact on crystal symmetry and distortions.

Main Methods:

  • Single-crystal synchrotron X-ray diffraction was employed.
  • Measurements were conducted up to 36 GPa.

Main Results:

  • Two phase transitions were observed at 1 GPa (to P21/c) and 6 GPa (to Pnma).
  • Jahn-Teller (JT) distortion and orbital order (OO) were maintained despite pressure-induced changes.
  • The Bi(3+) lone pair was identified as crucial for stabilizing JT distortion and OO.

Conclusions:

  • BiMnO3 undergoes significant structural changes under pressure, including symmetry modifications.
  • The interplay between pressure, JT distortion, OO, and the Bi(3+) lone pair is key to its behavior.