Magnetic and magnetocaloric properties of (1 − x)La0.7Sr0.3MnO3/xNaF composites
| Autor: | F.O. Milovich, T. P. Gavrilova, N. M. Lyadov, J.A. Deeva, I.F. Gilmutdinov, R. M. Eremina, T. I. Chupakhina, Yu. V. Kabirov, I.A. Faizrakhmanov |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Scanning electron microscope Lanthanum strontium manganite Composite number 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Electronic Optical and Magnetic Materials Magnetization chemistry.chemical_compound chemistry 0103 physical sciences Magnetic refrigeration Composite material 0210 nano-technology Spectroscopy Stoichiometry |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 467:49-57 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2018.07.047 |
| Popis: | (1 − x) La 0.7 Sr 0.3 MnO 3 /xNaF (x = 0.05, 0.15, 0.2) composites were synthesized by the conventional solid-state synthesis route, while the sodium fluoride NaF was added to the stoichiometric amount of La 2 O 3 , SrC O 3 and Mn 2 O 3 , that allowed to reduce the synthesis temperature of composites in respect to the pure lanthanum strontium manganite. The phase purity and microstructures of composites were analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Magnetocaloric effect was investigated by means of field dependence magnetization measurements. The significant affect of the additive NaF to the final size and morphology of (1 − x) La 0.7 Sr 0.3 MnO 3 /xNaF composite samples was observed. Though the high-concentration samples (x = 0.15, 0.2) exhibit the lower magnetic entropy changes Δ S M in respect to the pure La 0.7 Sr 0.3 MnO 3 , the expanded temperature dependence of Δ S M curves leads to the slightly higher values of the relative cooling power. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect