Chemical stability of magnetocaloric La(Fe<sub>x</sub>Co<sub>y</sub>Si<sub>1-x-y</sub>)<sub>13</sub> particles

POSTER

Abstract

Magnetocaloric refrigeration is an emerging technology that shows the potential to replace traditional vapor-compression systems. Considering water is a common heat exchange fluid in magnetocaloric devices, this study focuses on the stability of the room temperature magnetocaloric effect in La(FexCoySi1-x-y)13 alloys. Material characterization was performed on both milled and ground La(Fe0.84Co0.07Si0.08)13 powders stored in water and air for up to 14 days. Experimental results show that the powders grounded after storing in water, and air retain sharp magnetovolume transitions with entropy change (ΔS) values of 10.3 J/Kg.K and 7.1 J/Kg.K respectively (μH= 3 T), while the milled powders exhibit low ΔS values. The milled powders stored in air show slightly broadened transitions, whereas those stored in water show significantly broadened transitions with enhanced magnetization that can be attributed to the ferrimagnetic Fe3O4. Overall, our results indicate that ground La(FexCoySi(1-x-y))13 powders show promising MCE effects after exposure to air and water, while properties of milled powder deteriorate rapidly.

*Ames Laboratory is operated for the U.S. Department of Energy (DOE) by Iowa State University of Science and Technology under contract No. DE-AC02-07CH11358.

Presenters

  • Vaibhav Sharma

    • Mechanical and Nuclear Engineering, Virginia Commonwealth University

Authors

  • Vaibhav Sharma

    • Mechanical and Nuclear Engineering, Virginia Commonwealth University

  • khushar Javed

    • Mechanical and Nuclear Engineering, Virginia Commonwealth University

  • Anis Biswas

    • Division of Materials Science and Engineering, Ames Laboratory, US Dept. of Energy, Ames, IA, USA 50011

  • Shalabh Gupta

    • Ames Lab
    • Division of Materials Science and Engineering, Ames Laboratory, US Dept. of Energy, Ames, IA, USA 50011

  • Radhika Barua

    • Mechanical and Nuclear Engineering, Virginia Commonwealth University

  • Vitalji Pecharsky

    • Division of Materials Science and Engineering, Ames Laboratory, US Dept. of Energy, Ames, IA, USA 50011

  • Magundappa Hadimani

    • Mechanical and Nuclear Engineering, Virginia Commonwealth University
    • Dept. of Mechanical and Nuclear Engineering, Virginia Commonwealth University
    • Virginia Commonwealth Univ
    • Mechanical and Nuclear Engineering and Biomedical Engineering, Virginia Commonwealth University