Weak ferromagnetic state in the polar phase of Bi1−xCaxFe1−x/2Nbx/2O3 multiferroics
Khomchenko V. A., Ivanov M. S., Karpinsky D. V., Dubkov S. V., Silibin M. V., Paixão J. A.
Materials Letters
Vol.235, P. 46-48
Опубликовано: 2019
Тип ресурса: Статья
DOI:10.1016/j.matlet.2018.10.006
Аннотация:
In this paper, we report on the crystal structure, magnetic and local ferroelectric properties of the Bi1−xCaxFe1−x/2Nbx/2O3 (x ≤ 0.2) compounds prepared by a solid state reaction method. The chemical substitution has been found to reduce the polar ionic displacements in the acentric R3c structure and give rise to the formation of the non-polar Pnma phase at x = 0.2. The substitution-driven decrease of spontaneous polarization is accompanied by the suppression of the cycloidal antiferromagnetic order specific to the parent BiFeO3. As a result, a weak ferromagnetic and ferroelectric state is formed at x ≈ 0.18. Lattice defects contribute to the instability of the cycloidal structure, thus providing the antiferromagnetic + weak ferromagnetic phase coexistence observed over a wide range of Ca/Nb concentrations. © 2018 Elsevier B.V.
Ключевые слова:
BiFeO3; Crystal structure; Ferroelectrics; Magnetically ordered materials; Multiferroics; Spin cycloid
Antiferromagnetism; Ferroelectric materials; Ferroelectricity; Ferromagnetic materials; Ferromagnetism; Solid state reactions; Antiferromagnetic orderings; BiFeO3; Magnetically ordered material; Multiferroics; Solid state reaction method; Spin cycloids; Spontaneous polarizations; Weak ferromagnetic phase; Crystal structure
Язык текста: Английский
ISSN: 1873-4979
Khomchenko V. A.
Ivanov M. S.
Karpinsky D. V.
Dubkov S. V.
Silibin M. V. Maksim Viktorovich 1983-
Paixão J. A.
Хомченко В. А.
Иванов М. С.
Карпинскy Д. В.
Дубков С. В.
Силибин М. В. Максим Викторович 1983-
Паихãо Й. А.
Weak ferromagnetic state in the polar phase of Bi1−xCaxFe1−x/2Nbx/2O3 multiferroics
Текст визуальный непосредственный
Materials Letters
Elsevier Science Publisher B.V.
Vol.235 P. 46-48
2019
Статья
BiFeO3 Crystal structure Ferroelectrics Magnetically ordered materials Multiferroics Spin cycloid
Antiferromagnetism Ferroelectric materials Ferroelectricity Ferromagnetic materials Ferromagnetism Solid state reactions Antiferromagnetic orderings BiFeO3 Magnetically ordered material Multiferroics Solid state reaction method Spin cycloids Spontaneous polarizations Weak ferromagnetic phase Crystal structure
In this paper, we report on the crystal structure, magnetic and local ferroelectric properties of the Bi1−xCaxFe1−x/2Nbx/2O3 (x ≤ 0.2) compounds prepared by a solid state reaction method. The chemical substitution has been found to reduce the polar ionic displacements in the acentric R3c structure and give rise to the formation of the non-polar Pnma phase at x = 0.2. The substitution-driven decrease of spontaneous polarization is accompanied by the suppression of the cycloidal antiferromagnetic order specific to the parent BiFeO3. As a result, a weak ferromagnetic and ferroelectric state is formed at x ≈ 0.18. Lattice defects contribute to the instability of the cycloidal structure, thus providing the antiferromagnetic + weak ferromagnetic phase coexistence observed over a wide range of Ca/Nb concentrations. © 2018 Elsevier B.V.