Effect of chemical substitution on the Neacuteel temperature of multiferroic Bi1-xCaxFeO3

Gustau Catalan*, Kripasindhu Sardar, Nathan S. Church, James F. Scott, Richard J. Harrison, Simon A. T. Redfern

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

99 Citations (Scopus)

Abstract

Multiferroic BiFeO3 ceramics have been doped with Ca and it is found that the magnetic Neel temperature (T-Neacuteel) increases as Ca concentration increases, at a rate of 0.66 K per 1% Ca (molar). The smaller ionic size of Ca compared with Bi results in a contraction of the lattice, suggesting that Ca doping can be regarded as a proxy for hydrostatic pressure, with an equivalence of 1% Ca=0.3 GPa. Combining these results, we argue that hydrostatic pressure should increase the magnetic transition temperature of BiFeO3 at a rate around partial derivative T-N/partial derivative P similar to 2.2 K/GPa. Our results also suggest that pressure (chemical or hydrostatic) may be used to bring the ferroelectric critical temperature T-c and the magnetic T-Neacuteel closer together, thereby enhancing magnetoelectric coupling, provided that electrical conductivity can be kept sufficiently low.

Original languageEnglish
Article number212415
Number of pages4
JournalPhysical Review. B, Condensed matter and materials physics
Volume79
Issue number21
DOIs
Publication statusPublished - Jun 2009

Keywords

  • bismuth compounds
  • calcium compounds
  • doping profiles
  • electrical conductivity
  • ferroelectric ceramics
  • ferroelectric transitions
  • magnetoelectric effects
  • multiferroics
  • Neel temperature
  • SOLID-SOLUTIONS
  • SUPEREXCHANGE INTERACTION
  • CRYSTAL-STRUCTURE
  • BISMUTH FERRITE
  • HIGH-PRESSURE
  • RARE-EARTH
  • TRANSITION
  • CERAMICS
  • CAFEO3
  • DIFFRACTION

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