Effect of Ca doping on modulated structures in multiferroic Bi1−xCaxFeO3

Takumi Hiroyama, Akihiko Hirata, Yasuhide Inoue, Yoichi Horibe, Yasumasa Koyama

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Abstract

The crystallographic features of Bi1xCaxFeO3 samples with x = 0.10, 0.15, 0.20, and 0.30 compositions are investigated by transmission electron microscopy. Perovskite-based modulated structures are found in all the samples except for the x = 0.10 sample where a rhombohedral R3c BiFeO3-type structure is observed at room temperature. The in situ heating experiment indicates that the modulated structure appears even in the x = 0.10 sample at 673 K or higher. At room temperature, the modulation direction is found to change at approximately x = 0.20. The models of the modulated structures are constructed by introducing periodic antiphase boundaries in terms of the M3-type rotational displacements of the FeO6 octahedra. The electron diffraction patterns simulated from the models are in good agreement with the experimental results. The composition dependence of the modulated structures is also discussed.

Original languageEnglish
Article number054601
Journaljournal of the physical society of japan
Volume88
Issue number5
DOIs
Publication statusPublished - 2019 Jan 1

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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