Speaker
Mr
Jean Jules Mboukam
(University of Johannesburg)
Description
The intermetallic ternary compounds Dy2NiSi3 and Tm2NiSi3 crystallize in the AlB2 type of hexagonal structure with the space group P6/mmm. The magnetic properties were studied by measuring magnetization as a function of temperature (χ(T)), magnetic field (M(H)) and heat capacity (Cp(T)) in magnetic fields up to 7 T. Temperature dependent magnetization and heat capacity results revealed that Dy2NiSi3 shows an antiferromagnetic ordering with Néel temperature at around 5.9 K while Tm2NiSi3 does not show any transition above 2 K. The magnetocaloric effect (MCE) of the two compounds have been evaluated from isothermal magnetization (M(T,H)). Maximum values of isothermal magnetic entropy change (−ΔSM) and adiabatic temperature change are found to be 20.9 J/kg-K and 11.4 K respectively for Dy2NiSi3 and 21.7 J/kg-K and 13.4 K for Tm2NSi3 for a field change up to 7 T.
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
PhD
Apply to be<br> considered for a student <br> award (Yes / No)?
yes
Primary author
Mr
Jean Jules Mboukam
(University of Johannesburg)
Co-authors
Prof.
Andre M Strydom
(University of Johannesburg)
Dr
Badyanath Sahu
(University of Johannesburg)
