Magnetoelectric effect in Sm-substituted tungsten bronze structure Ba4(Sm La1-)2Fe2Nb8O30 ceramics
| Autor: | Xiao Qiang Liu, Yong Jun Wu, Cheng Li, Juan Li, Jiang Sheng Hong, Yu Hui Huang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Ionic radius Condensed matter physics Rietveld refinement Mechanical Engineering Metals and Alloys Magnetoelectric effect 02 engineering and technology Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology Magnetic hysteresis 01 natural sciences Ferroelectricity 0104 chemical sciences Mechanics of Materials visual_art Materials Chemistry visual_art.visual_art_medium Dielectric loss Ceramic 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 786:126-133 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.01.242 |
| Popis: | Magnetoelectric effect is directly measured in the Ba4(SmxLa1-x)2Fe2Nb8O30 ceramics, which is rarely reported in tungsten bronze ceramics. Besides, the effects of Sm-substitution on the crystal structure, dielectric, ferroelectric and magnetic properties have been systematically studied. XRD Rietveld refinement confirms all the ceramics to be single phase with space group of P4bm. With the increase of x, Ba4(SmxLa1-x)2Fe2Nb8O30 ceramics transform from paraelectric to ferroelectric. The compositions of x = 0.9, 0.95 and 1 show first-order ferroelectric phase transitions above room temperature. Compared to composition x = 0, the dielectric constant of other compositions exhibits frequency stability and the dielectric loss decreases apparently at room temperature. The ferroelectricity improves with increasing x, which can be ascribed to the increased A2-A1 ionic radius difference. Meanwhile, the magnetic hysteresis loops are obtained for some compositions. All the results approve Ba4(SmxLa1-x)2Fe2Nb8O30 (x = 0.9, 0.95, 1) ceramics as room temperature multiferroic materials with intrinsic magnetoelectric effect. |
| Databáze: | OpenAIRE |
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