Structural, magnetic and magnetocaloric properties in the rare earth ruthenate RE3RuO7 (RE = Pr, Nd, Gd and Tb) oxides with fluorite related structure. Issue 24 (15th December 2022)

• Record Type: Journal Article
• Authors: He, Ningzhou; Wang, Pengyu; Huang, Jiaohong; Wang, Xinhua; Zhang, Yikun; Hu, Liang; Li, Lingwei; Yan, Mi
• Is Part Of: Ceramics international. Volume 48:Issue 24(2022)
• Page Start: 36968
• Page End: 36974
• Publication Date: 2022-12-15
• Subjects: Magnetocaloric effect -- Rare earths -- RE3RuO7 compounds -- Magnetic properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.08.265
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The magnetic refrigeration (MR) based on magnetocaloric effect (MCE) is a key technique, since it possesses ideally higher performance than the traditional gas compression technology. However, the lack of MR materials with excellent MCE performance is a bottle-neck for practical MR applications. Herein, we systematically report the structural properties using powder X-ray diffraction and scanning electron microscope as well as the magnetic and magnetocaloric properties through the magnetization measurements of four rare-earth ( RE ) ruthenate RE 3 RuO7 ( RE = Pr, Nd, Gd and Tb) compounds. Light RE -based Pr3 RuO7 and Nd3 RuO7 compounds form an orthorhombic Cmcm structure, while heavy RE based Gd3 RuO7 and Tb3 RuO7 compounds crystallize in an orthorhombic P 21 nb structure. The magnetic phase transition of all the present compounds are confirmed to be of the first-order type with T N of 52, 15, 11 and 12 K for Pr3 RuO7, Nd3 RuO7, Gd3 RuO7 and Tb3 RuO7 compounds, respectively. The related MCE parameters including the maximum isothermal magnetic entropy change, temperature-averaged entropy change (5 K lift), and refrigerant capacity with the magnetic field change of 0–5 T were computed to be 1.35 J/kgK, 1.31 J/kgK, and 27.4 J/kg for Pr3 RuO7, to be 2.18 J/kgK, 2.04 J/kgK, and 25.6 J/kg for Nd3 RuO7, to be 8.12 J/kgK, 7.90 J/kgK, and 124.6 J/kg for Gd3 RuO7, and to be 7.78 J/kgK, 7.49 J/kgK, and 128.8 J/kg for Tb3 RuO7, respectively.