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Structurally ferroelectric SrMgF4.

S C Abrahams1

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

Acta Crystallographica. Section B, Structural Science
|January 31, 2002
PubMed
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Strontium magnesium tetrafluoride (SrMgF4) doped with cerium (Ce) exhibits structural characteristics indicating ferroelectricity. This two-dimensional ferroelectric material has a predicted Curie temperature of approximately 1450 K.

Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Crystallography

Background:

  • Ferroelectricity in fluorides is an area of active research.
  • Understanding the structural basis of ferroelectricity is crucial for designing new materials.
  • Strontium magnesium tetrafluoride (SrMgF4) is a relevant host material.

Purpose of the Study:

  • To investigate the ferroelectric properties of cerium-doped strontium magnesium tetrafluoride (SrMgF4).
  • To determine if SrMgF4 meets the structural requirements for ferroelectricity.
  • To predict key ferroelectric parameters like Curie temperature and spontaneous polarization.

Main Methods:

  • Analysis of the crystal structure of 0.06% Ce-doped SrMgF4.
  • Evaluation of structural criteria for ferroelectricity based on atomic displacements.

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  • Estimation of spontaneous polarization and Curie temperature.

    • Main Results:

    • The crystal structure of Ce-doped SrMgF4 satisfies the criteria for ferroelectricity.
    • A predicted Curie temperature (T(c)) of approximately 1450 K was determined.
    • An estimated spontaneous polarization (P(s)) of approximately 11 x 10(-2) C x m(-2) was calculated.

    Conclusions:

    • Cerium-doped SrMgF4 is a promising two-dimensional ferroelectric material.
    • The material's ferroelectric switching involves specific atomic coordinate displacements.
    • The predicted high Curie temperature suggests potential for high-temperature applications.