Evidence of room-temperature magnetodielectric effect in brownmillerite KBiFe2O5 through magnetic, complex dielectric, and impedance study
| Autor: | P. Pal, K. Chandrakanta, R. Jena, S. D. Kaushik, Md. F. Abdullah, Anil Kumar Singh, S. R. Mohapatra |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Relaxation (NMR) Dielectric engineering.material Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Magnetic field Hysteresis 0103 physical sciences engineering Antiferromagnetism Brownmillerite Grain boundary Crystallite Electrical and Electronic Engineering |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 31:15875-15884 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-020-04149-1 |
| Popis: | We have investigated the structural, magnetic, dielectric, and magnetodielectric properties of brownmillerite-structured polycrystalline KBiFe2O5 (KBFO) sample synthesized using conventional solid-state reaction route. Monoclinic structure with P2/c space group is determined from Rietveld refined X-ray diffraction (XRD) analysis. Temperatures-dependent magnetic and dielectric data show a broad hump around 510 °C, indicating the existence of magnetodielectric effect in KBFO. Room-temperature M–H hysteresis measurement possesses a weak ferromagnetic order (MR = 0.006 emu/g and Hc = 1100 Oe) originating from the canted Fe3+ moments due to antiferromagnetic ordering. This canted Fe3+ moment is also reflected in magnetic field variation of magnetodielectric (MD) measurement at room temperature, in which MD does not trace the original path by reversing the field. The highest magnetodielectric response is obtained to be ~ − 1.8% at room temperature. Modulus and complex impedance spectrum analysis attributes the bulk contribution to the observed room-temperature magnetodielectric at high frequency (> 10 kHz) and extrinsic contribution ( |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink