Eu doping-induced enhancement of magnetocaloric effect in manganite La1.4Ca1.6Mn2O7. (April 2015)

• Record Type: Journal Article
• Authors: Ma, Y.; Dong, Q.Y.; Ke, Y.J.; Wu, Y.D.; Zhang, X.Q.; Wang, L.C.; Shen, B.G.; Sun, J.R.; Cheng, Z.H.
• Is Part Of: Solid state communications. Volume 208(2015)
• Page Start: 25
• Page End: 28
• Publication Date: 2015-04
• Subjects: D. First-order phase transition -- D. Magnetic entropy change; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2015.02.017
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: The structure, magnetic properties and magnetocaloric effects of perovskite manganese oxides La1.4 Ca1.6 Mn2 O7 and La1.3 Eu0.1 Sr0.05 Ca1.55 Mn2 O7 have been investigated. They undergo a first-order ferromagnetic–paramagnetic phase transition around their respective Curie temperatures (235 K and 215 K, respectively). The doping of Eu and Sr atoms enhances greatly the value of magnetization, which leads to the large magnetocaloric effect. For a field change of 0–5 T, the maximum value of magnetic entropy change is only 4.5 J/kg K for La1.4 Ca1.6 Mn2 O7 compound. However, it increases to 7.1 J/kg K for La1.3 Eu0.1 Sr0.05 Ca1.55 Mn2 O7 compound. Meanwhile, a large refrigerant capacity of 240.4 J/kg is also achieved. Large reversible magnetocaloric effect and refrigerant capacity indicate the potentiality of La1.3 Eu0.1 Sr0.05 Ca1.55 Mn2 O7 compound as a candidate for magnetic refrigerant. Highlights: La1.3 Eu0.1 Sr0.05 Ca1.55 Mn2 O7 shows stronger magnetization than La1.4 Ca1.6 Mn2 O7 . La1.3 Eu0.1 Sr0.05 Ca1.55 Mn2 O7 is determined to exhibit a characteristic of first-order phase transition. Large magnetocaloric effect as well as scarcely any hysteresis loss is obtained in La1.3 Eu0.1 Sr0.05 Ca1.55 Mn2 O7 .