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Title: The magneto-structural transition in magnetocaloric Mn1-xFexCoGe
Authors: Ren, QY
Hutchison, WD
Wang, JL
Studer, AJ
Din, MFM
Muñoz-Pérez, S
Cadogan, JM
Campbell, SJ
Keywords: Cobalt alloys
Cooling systems
Energy conservation
Germanium alloys
Magnetic fields
Magnetic refrigerators
Manganese alloys
Neutron diffraction
Temperature dependence
X-ray diffraction
Issue Date: 3-Feb-2015
Publisher: Australian Institute of Physics
Citation: Ren, Q. Y., Hutchison, W. D., Wang, J., L., Studer, A. J., Md Din, M. F., Muñoz Pérez, S., Cadogan, J. M., & Campbell, S. J. (2015). The magneto-structural transition in magnetocaloric Mn1-xFexCoGe. Paper presented at the 39th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, 3 February 2015 - 6 February 2015, (pp. 59). Retrieved from:
Abstract: Magnetic refrigeration techniques based on the magnetocaloric effect are considered an increasingly viable alternative to conventional gas-compression refrigerant, particularly with energy-saving and environmental aspects in mind. Following the discovery of a large magnetocaloric effect in Gd5Si2Ge2, researchers have shifted their attention to investigation of materials exhibiting magneto-structural transitions where large magnetic entropy changes are expected. MnCoGe-based compounds are promising materials for the exploration of large magnetocaloric effects. They are relatively cheap (no rare earth elements) and, importantly, allow an appropriate temperature window (275 – 345 K) around room temperature in which the magneto-structural transition may be positioned. It has been established that Fe is a suitable substitute for Mn to ‘tune’ the structural transition temperature and hence obtain a magneto-structural transition. Here we present the results of a detailed investigation of the structural and magnetic properties and magnetocaloric effect for a range of as-prepared Mn1-xFexCoGe alloys (x = 0.01, 0.02, 0.03 and 0.04) using temperature variable x-ray diffraction (20 – 310 K), neutron diffraction (5 – 450 K) and physical properties measurement system (PPMS, 5 – 300 K). Particular attention will focus on analysis of neutron diffraction data for Mn0.98Fe0.02CoGe and the nature of the magnetic phase transition in Mn0.98Fe0.02CoGe.
ISBN: 978-0-646-96433-1
Appears in Collections:Conference Publications

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