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Phase Transitions02:31

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
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Isosymmetrical phase transition in alpha-YbV4O8.

Karen Friese1, Yasushi Kanke, Andy N Fitch

  • 1Departamento Física Materia Condensada, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain. karen.friese@ehu.es

Acta Crystallographica. Section B, Structural Science
|November 26, 2008
PubMed
Summary

The study reveals that alpha-YbV4O8 exhibits a phase transition at 70 K, leading to charge ordering of vanadium ions. This transition impacts its magnetic properties, similar to the beta polymorph.

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Magnetism

Background:

  • YbV4O8 exists in two polymorphs, alpha and beta, with differing Yb ion arrangements.
  • The structure is based on the CaFe2O4 type, featuring a 3D framework of VO6 octahedra with Yb3+ ions in tunnels.

Purpose of the Study:

  • To investigate the structural and magnetic properties of alpha-YbV4O8 across a range of temperatures.
  • To understand the nature of the phase transition occurring in the alpha polymorph.

Main Methods:

  • Temperature-dependent structural analysis.
  • Magnetic susceptibility measurements.

Main Results:

  • A first-order isosymmetrical phase transition was observed in alpha-YbV4O8 at approximately 70 K.
  • In the high-temperature phase, vanadium ions (V3+ and V4+) are disordered; charge ordering occurs in the low-temperature phase.
  • The transition is associated with a magnetic anomaly, suggesting spin-gap formation.

Conclusions:

  • The phase transition in alpha-YbV4O8 involves complete charge ordering of vanadium ions.
  • The transition mechanism is analogous to that observed in the beta polymorph of YbV4O8.
  • Spin-gap formation plays a role in the magnetic behavior during the transition.