The origin of the large magnetoelectric coupling in the ceramic Ba 0.1 Bi 0.9 (Ti 0.9 Zr 0.1 ) 0.1 Fe 0.9 O 3 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physics D: Applied Physics Année : 2021

The origin of the large magnetoelectric coupling in the ceramic Ba 0.1 Bi 0.9 (Ti 0.9 Zr 0.1 ) 0.1 Fe 0.9 O 3

Résumé

Abstract 57 Fe Mössbauer spectrometry and x-ray powder diffraction are conducted to examine the structure and the local magnetic order at the level of Fe sites of Ba 0.1 Bi 0.9 (Ti 0.9 Zr 0.1 ) 0.1 Fe 0.9 O 3 ceramic. The Mössbauer spectra in the temperature range of 77 K–623 K were analyzed using a discrete distribution of hyperfine field, indicating that the Néel temperature T N was about 603 K. The ceramic Ba 0.1 Bi 0.9 (Ti 0.9 Zr 0.1 ) 0.1 Fe 0.9 O 3 remains stable in the rhombohedral structure ( R 3 c ) in the temperature range of 300 K–800 K. The anomaly of volume below T N , as detected from the model Debye–Gruneissen, reveals the presence of magnetoelastic coupling in this compound. The total polarization ( P ) obtained from Rietveld refined atomic positions is found to depend on the magnetic order that leads to the decrease of the total polarization ( P ) through the anomaly volume. The reduction in the polarization by Δ P ∼ −2.4 μ C cm −2 suggests negative magnetoelectric interaction. The total polarization ( P ) obtained from Rietveld refined atomic is coupled with the magnetic ordering mediated by magnetoelastic coupling. The hyperfine field ( B hf ) dependence of polarization ( P ) at a temperature range below T N exhibits a linear evolution, confirming the linear magnetoelectric coupling. At room temperature, the linear magnetoelectric coefficient is about α ME ≈ 1.84 × 10 −9 s m −1 .
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Dates et versions

hal-03619597 , version 1 (25-03-2022)

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Imen Kallel, Hamadi Khemakhem, Zina Sassi, Najmeddine Abdelmoula, El-Kebir Hlil, et al.. The origin of the large magnetoelectric coupling in the ceramic Ba 0.1 Bi 0.9 (Ti 0.9 Zr 0.1 ) 0.1 Fe 0.9 O 3. Journal of Physics D: Applied Physics, 2021, 55 (6), pp.065303. ⟨10.1088/1361-6463/ac2c3a⟩. ⟨hal-03619597⟩
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