Enhancement of refrigeration capacity and table-like magnetocaloric effect in La0.8Ca0.2MnO3/La0.8K0.2MnO3 nanocrystalline composite. Issue 7 (August 2015)

• Record Type: Journal Article
• Authors: Wang, G.F.; Zhao, Z.R.; Li, H.L.; Zhang, X.F.
• Is Part Of: Ceramics international. Volume 41:Issue 7(2015)
• Page Start: 9035
• Page End: 9040
• Publication Date: 2015-08
• Subjects: B. Composite -- Magnetocaloric effect -- Refrigeration capacity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.03.275
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this paper we report on the magnetocaloric effect and refrigeration capacity (RC) of La0.8 Ca0.2 MnO3 (LCMO)/La0.8 K0.2 MnO3 (LKMO) composite with a mass fraction of 1:1. X-ray diffraction patterns indicate that the component manganites crystalize in the same rhombohedral structure. The LCMO and LKMO undergo second-order phase transitions at 247 K and 281 K, respectively. The maximum values of isothermal entropy change ( − Δ S T, max ) are found to be 4.25 J/kg K and 3.71 J/kg K under a magnetic field change of 5 T for LCMO and LKMO, respectively. The composite exhibits a table-like Δ S T curve with slightly lowered peak value. An enhancement of 33%–35% for RC has been found in the composite when comparing with those of the components. It reveals that the combination of magnetocaloric materials with different Curie temperatures is a possible method for improving RC.