Magnetic and dielectric properties of Ca-substituted BiFeO3nanoferrites by the sol-gel method
| Autor: | Zeping Guo, Jinpei Lin, Yun He, Qing Lin, Mei Li, Huang Kangling |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Biomedical Engineering Biophysics Bioengineering 02 engineering and technology General Medicine Dielectric 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity Biomaterials Ferromagnetism 0103 physical sciences Antiferromagnetism Multiferroics 0210 nano-technology Sol-gel |
| Zdroj: | Journal of Applied Biomaterials & Functional Materials. 16:93-100 |
| ISSN: | 2280-8000 |
| Popis: | Background:A multiferroic material can simultaneously show two or more basic magnetic properties, including ferromagnetism, antiferromagnetism, and ferroelectricity. BiFeO3is a multiferroic material with a rhombohedral distorted perovskite structure. Doping can reduce the volatility of Bi and greatly improve the magnetoelectric properties of BiFeO3.Methods:To investigate the influence of the doping content we used the following analytical methods: X-ray powder diffraction (XRD), scanning electron microscopy (SEM), microwave network analysis (PNA-N5244A), and the Superconducting Quantum Interference Device (Quantum Design MPMS) test.Results:With the increase of Ca2+concentration in the solution, the grain size of Bi1- xCaxFeO3becomes smaller, showing the role of Ca2+ions as the dopant for fine grains. The calcination temperatures are the major causes for the saturated magnetization. The residual magnetization ( Mr) and the coercive force ( Hc) decrease linearly with the increase of x value, and due to the effect of Ca2+substitution at Bi3+sites, which causes the valence change of Fe and/or the oxygen vacancies.Conclusions:The XRD result indicates that the diffraction peak emerges with the increase of Ca2+and the main diffraction peak achieves a high angle. The best calcining temperature is 600 °C, and the morphology is very dependent on the calcining temperature. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|