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Related Experiment Videos

Structure-property correlation over five phases and four transitions in Pb5Al3F19.

S C Abrahams1, J Ravez, H Ritter

  • 1Physics Department, Southern Oregon University, Ashland, OR 97520, USA. sca@mind.net

Acta Crystallographica. Section B, Structural Science
|October 31, 2003
PubMed
Summary

This study characterizes the five phases of Pb(5)Al(3)F(19) and their structural transitions using calorimetry and dielectric measurements. Doping with Cr(3+) significantly alters atomic positions and transition temperatures.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Pb(5)Al(3)F(19) exhibits complex phase behavior under ambient pressure.
  • Understanding phase transitions is crucial for materials development.

Purpose of the Study:

  • To correlate the structural properties with the calorimetric and dielectric characteristics of the five stable phases of Pb(5)Al(3)F(19).
  • To investigate the impact of Cr(3+) doping on the phase stability and transition temperatures.

Main Methods:

  • Calorimetric and dielectric property measurements.
  • X-ray and neutron diffraction powder profile analysis.
  • Group theoretical/normal mode analysis.

Main Results:

Related Experiment Videos

  • Detailed characterization of first and second-order phase transitions, including transition temperatures, thermal hysteresis, and atomic displacements.
  • Entropy changes were analyzed, with transitions primarily attributed to vibrational energy changes, except for the ferroelectric-antiferroelectric transition.
  • Cr(3+) doping at 0.04% significantly altered atomic positions and increased transition temperatures, while higher doping levels (≥20%) eliminated certain stable phases.

    • Conclusions:

    • The study provides a comprehensive understanding of the phase transitions in Pb(5)Al(3)F(19) and their structural underpinnings.
    • Lattice doping with Cr(3+) offers a route to tune the material's phase stability and transition characteristics.