Multiple magnetic phase transition and short-range ferromagnetic behavior influence on magnetocaloric effect of Sm 2 NiM
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RESEARCH PAPER
Multiple magnetic phase transition and short-range ferromagnetic behavior influence on magnetocaloric effect of Sm2NiMnO6 nanoparticles I. Phebe Kokila & P. Sathish Kumar & M. Kanagaraj & Anil Kumar Paidi & Liang He & S. Madeswaran & Helen Annal Therese Received: 27 March 2020 / Accepted: 29 July 2020 # Springer Nature B.V. 2020
Abstract Structural characteristics and magnetocaloric effect of Sm2NiMnO6 double perovskite oxide nanoparticles synthesized via the solution combustion technique have been investigated. From the X-ray structural study, it is found that the Sm2NiMnO6 compound crystallizes in the monoclinic structure (P21/n space group), where Ni and Mn atoms are ordered at 2c and 2d sites, respectively. Transmission electron microscopic image reveals
I. P. Kokila Nanotechnology Research Centre, SRM Institute of Science and Technology, Kattankulathur, Chengalpattu, Tamil Nadu 603203, India P. S. Kumar : S. Madeswaran Department of Physics, School of advanced sciences, VIT, Vellore 632014, India
agglomerated nanoparticles with an average particle size of 60 nm. Two magnetic Curie transition points (TC1 = 141 K, TC2 = 67 K) observed from the isofield magnetization measurement affirmed the short-range ferromagnetic behavior of Sm2NiMnO6 creating the continuous second-order transition followed by the discontinuous first-order transition. A minor cusp at 10 K confirmed the microscopic superparamagnetic behavior at low fields apart from the dual magnetic phase transition. Adiabatic demagnetization of Sm2NiMnO6 nanoparticles was measured in terms of magnetic entropy, and the magnetic refrigerant capacity was calculated to be 0.44 J kg−1 K−1 and ~ 20 J kg−1 respectively. Keywords Magnetically ordered materials . Chemical synthesis . Magnetocaloric . Magnetic measurements . Perovskite . Nanomaterials
M. Kanagaraj School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
Introduction A. K. Paidi Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology (IIT) Bombay, Mumbai 400076, India L. He York-Nanjing Joint Center for Spintronics and Nano Engineering (YNJC), School of Electronics Science and Engineering, Nanjing University, Nanjing 210093, People’s Republic of China H. A. Therese (*) Department of Chemistry, SRM Institute of Science and Technology, Kattankulathur, Chengalpattu, Tamil Nadu 603203, India e-mail: [email protected]
Modern solid-state cooling technology transcends the volatile liquid refrigerant–based conventional cooling system as it is inclined on offering higher working efficiency which helps in the conservation of energy. Solid-state cooling technologies involves the magnetocaloric, electrocaloric, elastocaloric, and barocaloric effects found in advanced novel caloric materials. Among these, magnetocaloric cooling has well developed over the years, bringing the technology for practical applications such as in heat pumps, centralized air conditioners, liquor distillation process, waste
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