Temperature-driven structural transformations in Ca/Ti- and Ba/Ti-doped BiFeO3
Khomchenko V. A., Karpinsky D. V., Zhaludkevich D. V., Latushka S. I., Franz A., Sikolenko V. V., Nekludov K. N., Dubkov S. V., Silibin M. V., Paixão J. A.
Materials Letters
Vol.254, P. 305-308
Опубликовано: 2019
Тип ресурса: Статья
DOI:10.1016/j.matlet.2019.07.091
Аннотация:
The structural parameters of the Bi0.85AE0.15Fe0.85Ti0.15O3 (AE = Ca and Ba) multiferroics have been determined using variable temperature neutron powder diffraction. The compounds adopt the polar rhombohedral R3c structure near room temperature and undergo phase transitions into either the nonpolar orthorhombic Pnma (AE = Ca) or cubic Pm3-m (AE = Ba) structures on heating. In the ferroelectric phase, a temperature-driven lattice expansion is accompanied by both a diminishing of the off-center ionic displacements (thus resulting in a decrease in the spontaneous electric polarization) and a reduction in the magnitude of the antiphase oxygen octahedra tilting. Being largely different for the materials under study, the latter parameter is supposed to specify the dissimilarity in their magnetic properties. © 2019 Elsevier B.V.
Ключевые слова:
BiFeO3; Crystal structure; Multiferroics; Neutron diffraction
Materials science; Neutron diffraction; Synthesis (chemical); BiFeO3; Electric polarization; Ferroelectric phase; Multiferroics; Near room temperature; Structural parameter; Structural transformation; Variable temperature; Crystal structure
Язык текста: Английский
ISSN: 1873-4979
Khomchenko V. A.
Karpinsky D. V.
Zhaludkevich D. V.
Latushka S. I.
Franz A.
Sikolenko V. V.
Nekludov K. N.
Dubkov S. V.
Silibin M. V. Maksim Viktorovich 1983-
Paixão J. A.
Хомченко В. А.
Карпинскy Д. В.
Жалудкевич Д. В.
Латюшка С. И.
Франз А.
Сиколенко В. В.
Неклудов К. Н.
Дубков С. В.
Силибин М. В. Максим Викторович 1983-
Паихãо Й. А.
Temperature-driven structural transformations in Ca/Ti- and Ba/Ti-doped BiFeO3
Текст визуальный непосредственный
Materials Letters
Elsevier Science Publisher B.V.
Vol.254 P. 305-308
2019
Статья
BiFeO3 Crystal structure Multiferroics Neutron diffraction
Materials science Neutron diffraction Synthesis (chemical) BiFeO3 Electric polarization Ferroelectric phase Multiferroics Near room temperature Structural parameter Structural transformation Variable temperature Crystal structure
The structural parameters of the Bi0.85AE0.15Fe0.85Ti0.15O3 (AE = Ca and Ba) multiferroics have been determined using variable temperature neutron powder diffraction. The compounds adopt the polar rhombohedral R3c structure near room temperature and undergo phase transitions into either the nonpolar orthorhombic Pnma (AE = Ca) or cubic Pm3-m (AE = Ba) structures on heating. In the ferroelectric phase, a temperature-driven lattice expansion is accompanied by both a diminishing of the off-center ionic displacements (thus resulting in a decrease in the spontaneous electric polarization) and a reduction in the magnitude of the antiphase oxygen octahedra tilting. Being largely different for the materials under study, the latter parameter is supposed to specify the dissimilarity in their magnetic properties. © 2019 Elsevier B.V.