Partial cation ordering, relaxor ferroelectricity, and ferrimagnetism in Pb(Fe1 − xYbx)2/3W1/3O3 solid solutions

Ivanov, S.A.; Joshi, D.C.; Bush, A.A.; Wang, D.; Sanyal, B.; Eriksson, O.; Nordblad, P.; Mathieu, R.

Авторы: Ivanov S.A., Joshi D.C., Bush A.A., Wang D., Sanyal B., Eriksson O., Nordblad P., Mathieu R.
Журнал: Journal of Applied Physics
Том: 128
Номер: 13
Год издания: 2020
Издательство: AIP Publishing
Местоположение издательства: United States
Первая страница: 134102
Последняя страница: 134102
DOI: 10.1063/5.0011576
Аннотация: The structural, magnetic, and dielectric properties of ceramic samples of Yb-doped PbFe2/3W1/3O3 have been investigated by a variety ofmethods including x-ray powder diffraction, magnetometry, and dielectric spectroscopy. In addition, theoretical investigations were madeusing first-principles density functional calculations. All the doped samples Pb(Fe1 − xYbx)2/3W1/3O3 (PFYWO) (0.1 ≤ x ≤ 0.5) were found tocrystallize in an ordered cubic (Fm3m) structure with partial ordering in the B-perovskite sites. Observed changes in the cationic order wereaccompanied by differences in the dielectric and magnetic responses of the system. While pure PbFe2/3W1/3O3 is antiferromagnetic, thedoped Pb(Fe1 − xYbx)2/3W1/3O3 PFYWO samples display excess moments and ferrimagnetic-like behavior, associated with differences in B0and B00 site occupancies of the magnetic Fe3+ cations. The magnetic transition temperature of the ferrimagnetic phase is found to decreasewith increasing Yb content, from TN ∼350 K of the undoped sample down to 137 K for x = 0.5. All PFYWO compounds display a ferroelectricrelaxor behavior akin to that of PbFe2/3W1/3O3, albeit our results show significant changes of the frequency and temperature dependenceof the dielectric properties. The changes of the properties of PFYWO with increasing Yb substitution can be explained by the changes in thecation size/charge mismatch and the size difference of the two ordered positions.
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Partial cation ordering, relaxor ferroelectricity, and ferrimagnetism in Pb(Fe1 − xYbx)2/3W1/3O3 solid solutionsстатья Электронная публикация

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