The role of Tb-doping on the structural and functional properties of Bi4−xTbxTi3O12 ferroelectric phases with the Aurivillius type structure

Synthesis, crystal structure, dielectric, and magnetic properties of the Aurivillius phase Bi4−xTbxTi3O12 (x = 0.0, 0.4, 0.6, 0.8) are reported. The samples were synthesized using standard solid state reaction technique. The thermal stability of the obtained solid solutions was investigated. For x ≤ 0.8, the samples crystallized in an orthorhombic symmetry. All the samples showed finite second harmonic generation response indicating a non-centrosymmetric structure. The structural data could be refined using the polar orthorhombic space group B2cb. The orthorhombicity decreases with an increase in the Tb3+ concentration. The orthorhombic distortions in these compositions are related to the Bi3+-based perovskite sublattice. Our results indicate that the non-lone pair Tb3+ cations preferentially occupy the perovskite sublattice initially, but with an increase in the doping concentration they can partially substitute the Bi3+ ions in the fluorite block. Temperature dependent dielectric measurements revealed a decrease in the ferroelectric Curie temperature TC with an increase in x from TC = 904 K (for x = 0) to 877 K (for x = 0.4). Further increase in x led to a cross-over to a relaxor-type behavior. Magnetic measurements showed that the samples are paramagnetic down to 5 K. © 2016, The Author(s).

Авторы
Sarkar T.1 , Ivanov S.A.1, 2 , Fortalnova E.A. 3 , Politova E.D. 2 , Safronenko M.G. 3 , Nordblad P.1 , Mathieu R.1
Редакторы
-
Издательство
Springer New York LLC
Номер выпуска
6
Язык
Английский
Страницы
4914-4924
Статус
Опубликовано
Подразделение
-
Номер
-
Том
28
Год
2017
Организации
  • 1 Department of Engineering Sciences, Uppsala University, Box 534, Uppsala, 75121, Sweden
  • 2 Karpov Institute of Physical Chemistry, ul. Vorontsovo Pole 10, Moscow, 105064, Russian Federation
  • 3 RUDN University, ul. Miklukho-Maklaya 6, Moscow, 117198, Russian Federation
Ключевые слова
Ferroelectricity; Harmonic generation; Nonlinear optics; Perovskite; Solid state reactions; Thermodynamic stability; Aurivillius-type structures; Dielectric measurements; Functional properties; Orthorhombic distortion; Orthorhombic space groups; Orthorhombic symmetry; Solid-state reaction techniques; Temperature dependent; Crystal structure
Дата создания
19.10.2018
Дата изменения
19.10.2018
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/5604/