Effects of synthesis route on the structural,magnetic and magnetocaloric properties of Pr0.8K0.2MnO3 |
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| Affiliation: | 1. Laboratory of Physics of Materials, Faculty of Sciences of Sfax, Sfax University, B.P.1171, 3000 Sfax, Tunisia;2. Unité de recherche Matériaux Avancés et Nanotechnologies (URMAN), Institut Supérieur des Sciences Appliquées et de Technologie de Kasserine, Kairouan University, BP 471, Kasserine 1200, Tunisia;3. Centre de recherche en informatique, Multimédia et traitement Numérique des données, Technopôle de sfax, 3021 Sfax, Tunisia;4. Institut NEEL, B.P.166, 38042 Grenoble Cedex 09, France;1. Department of Physics and Astronomy, Texas A&M University, College Station, 77843, TX, USA;2. Department of Mechanical Engineering, Texas A&M University, College Station, 77843, TX, USA;3. Department of Materials Science and Engineering, Texas A&M University, College Station, 77843, TX, USA;4. School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240, China;1. Laboratoire de la matière condensée et des nanosciences, département de physique, faculté des sciences university de Monastir, 5019 Tunisia;2. Institut Néel, CNRS et Université Joseph Fourier, BP 166, 38042 Grenoble, France;1. LPM, Université de Sfax, Faculté des Sciences de Sfax, BP 1171, 3000 Sfax, Tunisia;2. ITODYS, Université Paris Diderot, CNRS UMR 7086, 15 rue Jean Antoine de Baïf, 75205 Paris, France;1. Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, B. P. 1171, 3000 Sfax, Tunisia;2. Institut NEEL, B.P. 166, 38042 Grenoble Cedex 9 France;1. Khanh Hoa University, 01 Nguyen Chanh Street, Nha Trang City, Khanh Hoa Province, Vietnam;2. Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, CauGiay District, Ha Noi, Vietnam;3. Faculty of Technology, Hong Duc University, 565 QuangTrung Street, ThanhHoa City, Vietnam;4. Department of Advanced Materials Chemistry, Dongguk University-Gyeongju, 707 Suckjang-dong, Gyeongju-Si, Gyeongbuk 780-714, South Korea |
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| Abstract: | Pr0.8K0.2MnO3 ceramics are prepared by solid-state reaction and Pechini sol–gel method. The influence of the powder synthesis method on the structural, morphological, magnetic and magnetocaloric properties of the samples are investigated. The X-ray diffraction pattern shows reflections typical of the perovskite structure with orthorhombic symmetry. The experimental results reveal that both samples undergo a second-order phase transition. The maximum magnetic entropy changes, deduced from the M–µ0H measurements, are 3.77 and 7.23 J/kg K under the magnetic field change of 5 T for Pr0.8K0.2MnO3 synthesized by using solid-state reaction and sol–gel methods respectively. The field dependence of magnetic entropy change is analyzed showing the power law dependence, ΔS(T,µ0H)=a(T)(μ0H)n(T,H) at the Curie temperature. Using the scaling laws of ∆S, the experimental ∆S collapse onto a universal curve for both ceramics. These results suggest that the physical properties of our samples are strongly depended on synthesis techniques. It is found that Pechini sol–gel method is more efficient and stable to obtain ceramic materials with good magnetic properties. Consequently, a substantial increase of the ferromagnetic to paramagnetic transition temperature and an enhancement of magnetocaloric properties are observed in the sol-gel made sample making it more suitable for magnetic refrigeration applications. |
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| Keywords: | Preparation methods Magnetization Magnetocaloric effect Manganites |
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