Effects of Sr-substitution on structure, dielectric, ferroelectric and magnetic properties of (SrxBa1-x)4Sm2Fe2Nb8O30 ceramics
| Autor: | Xiao Qiang Liu, Juan Li, Yu Hui Huang, Yong Jun Wu, Jiang Sheng Hong |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Mechanical Engineering Metals and Alloys Analytical chemistry chemistry.chemical_element 02 engineering and technology Dielectric Tungsten 010402 general chemistry 021001 nanoscience & nanotechnology Magnetic hysteresis 01 natural sciences Ferroelectricity 0104 chemical sciences Hysteresis Tetragonal crystal system chemistry Mechanics of Materials visual_art Materials Chemistry visual_art.visual_art_medium Multiferroics Ceramic 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 770:143-148 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2018.08.109 |
| Popis: | (Sr x Ba 1- x ) 4 Sm 2 Fe 2 Nb 8 O 30 ( x = 0, 0.1, 0.2, 0.3, 0.4) ceramics with tetragonal bronze structure were prepared by the standard solid-state method. With the increase of x , (Sr x Ba 1- x ) 4 Sm 2 Fe 2 Nb 8 O 30 ceramics transform from ferroelectric to paraelectric. The composition x = 0 shows first-order ferroelectric transition with T c above room temperature. The other compositions exhibit broad dielectric peaks with frequency dispersion, indicating a relaxor ferroelectric transition. Saturated P-E hysteresis loops and obvious peaks in the charging current–field ( J-E ) curves are observed at room temperature for x = 0 and 0.1 while paraelectric characteristics are detected for the others. Magnetic hysteresis loops are obtained for all the compositions and the remanent moment increases monotonously from 0.14 emu/g to 1.21 emu/g with the increasing concentration of Sr. All the results are expected to provide valuable guidance for searching new multiferroic tungsten bronze ceramics. |
| Databáze: | OpenAIRE |
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