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

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


研究成果: Article査読

1 被引用数 (Scopus)


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.

ジャーナルjournal of the physical society of japan
出版ステータスPublished - 2019 1月 1

ASJC Scopus subject areas

  • 物理学および天文学(全般)


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