Hybridization between microstructure and magnetization improvement in lead and RE co-doped BiFeO3
来源期刊：JOURNAL OF RARE EARTHS2016年第5期
论文作者：M.A.Ahmed S.F.Mansour S.I.El-Dek M.M.Karamany
文章页码：495 - 506
摘 要：The crystal structure,magnetic and electrical properties of Bi0.96Pb0.04 FeO3 and Bi0.92Pb0.04RE0.04FeO3（RE=La,Sm,Dy and Yb）polycrystalline samples were prepared by the flash autocombustion technique.X-ray diffraction（XRD）measurements show that the rare-earth doped compositions crystallized in rhombohedral symmetry of space group R3 c.The undoped sample consisted needle shape particles while rare earth substitution preferred platelet like particles as clarified from high resolution transmission electron microscopy（HRTEM）.Morphological features were examined using field emission scanning electron microscopy（FESEM）.Magnetization measurements showed that Yb3+ samples possessed the highest room temperature saturation magnetization while when Bi3+ ions were substituted by La3+ ions,a smaller MS（0.28 emu/g）was obtained.The coexistence of ferroelectric and magnetic transitions was detected using DSC and χM,indicating the multiferroic characteristics of Bi0.92Pb0.04RE0.04FeO3 crystallites.The Néel temperature shifted upwards with decreasing the ionic radius of rare earth ion.Nice correlation was established between microstructure,morphology and magnetic properties in view of the contribution of magnetocrystalline and shape anisotropy in the magnetic parameters values.
M.A.Ahmed1，S.F.Mansour2，S.I.El-Dek3，M.M.Karamany1,4
1. Materials Science Lab.(1),Physics Dept.,Faculty of Science,Cairo University2. Physics Department,Faculty of Science,Zagazig University3. Materials Science and Nanotechnology Dept.,Faculty of Post Graduate Studies for Advanced Sciences,Beni-Suef University4. Basic Science Dept.,Faculty of Engineering,British University in Egypt
摘 要：The crystal structure,magnetic and electrical properties of Bi0.96Pb0.04 FeO3 and Bi0.92Pb0.04RE0.04FeO3（RE=La,Sm,Dy and Yb）polycrystalline samples were prepared by the flash autocombustion technique.X-ray diffraction（XRD）measurements show that the rare-earth doped compositions crystallized in rhombohedral symmetry of space group R3 c.The undoped sample consisted needle shape particles while rare earth substitution preferred platelet like particles as clarified from high resolution transmission electron microscopy（HRTEM）.Morphological features were examined using field emission scanning electron microscopy（FESEM）.Magnetization measurements showed that Yb3+ samples possessed the highest room temperature saturation magnetization while when Bi3+ ions were substituted by La3+ ions,a smaller MS（0.28 emu/g）was obtained.The coexistence of ferroelectric and magnetic transitions was detected using DSC and χM,indicating the multiferroic characteristics of Bi0.92Pb0.04RE0.04FeO3 crystallites.The Néel temperature shifted upwards with decreasing the ionic radius of rare earth ion.Nice correlation was established between microstructure,morphology and magnetic properties in view of the contribution of magnetocrystalline and shape anisotropy in the magnetic parameters values.
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