Publication Date
12-16-2020
Department
Ames Laboratory
Campus Units
Ames Laboratory
OSTI ID+
1735845
Report Number
IS-J 10377
DOI
10.1088/1361-648X/abcdb2
Journal Title
Journal of Physics: Condensed Matter
Volume Number
33
Issue Number
9
First Page
095804
Abstract
A comparative study has been carried out on the magnetocaloric properties of as-cast and annealed Tb2Ni0.90Si2.94 intermetallic compound. While the as-cast material exhibits ferromagnetic cluster-glass behaviour below 9.9 K coexisting with antiferromagnetic (AFM) interaction, the annealed system shows AFM ordering below 13.5 K and spin freezing occurs below 4 K. The compound exhibits moderate magnetocaloric performance with maximum isothermal entropy changes (−ΔSM) 8.8 and 10.9 J kg−1 K−1, relative cooling power (RCP) 306 and 365 J kg−1, along with adiabatic temperature change (ΔTad) 5.5 and 8.15 K for 70 kOe magnetic field change in as-cast and annealed forms, respectively. The estimated magnetic entropy change is found to be larger for annealed sample in comparison to that of as-cast analogue. However, the full width at half maxima (FWHM) of −ΔSM(T) behaviour is larger in as-cast compound due to the presence of inherent structural disorder which reduces with thermal annealing. A positive isothermal entropy change (−ΔSM) and adiabatic temperature change (ΔTad) is observed for the as-cast compound in the measured field and temperature region. In contrast, the annealed system exhibits inverse magnetocaloric effect in the low field and temperature region where AFM interactions dominate. Magnetocaloric effect (MCE) is used as a tool to establish a subtle correlation between the observed magnetocaloric effect and the reported magnetic properties of the system.
DOE Contract Number(s)
AC02-07CH11358
Language
en
Publisher
Iowa State University Digital Repository, Ames IA (United States)
