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Effect of Monovalent Cation Doping on Structural, Magnetic, and Magnetocaloric Properties of Pr0.85 A 0.15MnO3 (A = Ag and K) Manganites

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Abstract

A systematic study on the effect of monovalent cation doping on structural, magnetic, and magnetocaloric properties of Pr0.85 A 0.15MnO3 (A = Ag and K) samples synthesized by a sol-gel method has been carried out. The crystal structure and morphology have been worked by X-ray diffraction (XRD) and scanning electron microscopy (SEM) imaging measurements. The XRD results indicate that both samples have orthorhombic structure. Magnetization versus temperature measurements show that our samples display a ferromagnetic-to-paramagnetic phase transition with increasing temperature. The ferromagnetic-to-paramagnetic phase transition temperature (T C) values were found as 74 and 116 K for Pr0.85Ag0.15MnO3 and Pr0.85 K 0.15MnO3, respectively. The magnetic entropy changes were evaluated from isothermal magnetization curves measured at various temperatures near T C by steps of 4 K. The values of the magnetic entropy change were determined as 0.99 and 1.39 J kg −1 K −1 for Pr0.85Ag0.15MnO3 and Pr0.85 K 0.15MnO3 under external field changes of 10 kOe, respectively.

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Acknowledgments

This work is supported by the Research Fund of Adıyaman University, Adıyaman, Turkey, under grant contract no. FEFBAP/2014-0008 and the Research Fund of Çukurova University, Adana, Turkey, under grant contract nos. FBA-2015-5028 and FEF2012D12.

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Authors and Affiliations

  1. Department of Physics, Faculty of Sciences and Letters, Çukurova University, 01330, Adana, Turkey

    Gönül Akça, Selda Kılıç Çetin, Mustafa Akyol & Ahmet Ekicibil

  2. Department of Mechatronics Engineering, Faculty of Technology, Adıyaman University, 02040, Adıyaman, Turkey

    Ali Osman Ayaş

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  1. Gönül Akça
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  2. Ali Osman Ayaş
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Akça, G., Ayaş, A.O., Çetin, S.K. et al. Effect of Monovalent Cation Doping on Structural, Magnetic, and Magnetocaloric Properties of Pr0.85 A 0.15MnO3 (A = Ag and K) Manganites. J Supercond Nov Magn 30, 1515–1525 (2017). https://doi.org/10.1007/s10948-016-3946-8

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