Thermodynamic and magnetic measurements of ternary compounds
RCo9Si4 with R = Pr, Nd, and Sm were analyzed in order to estimate
the magnetic entropy, specific heat jump and effective magnetic moments. The
samples show a ferromagnetic behaviour at low temperature with TC
varying from 10 to 35 K. The saturation magnetisation Ms at 2 K with 6 T
is found to be about 23.20, 24.94 and 10.70 emu/g for R = Pr, Nd, and Sm,
respectively. The total effective magnetic moments μeff of
RCo9Si4 for R = Pr , Nd, and Sm as obtained from the Curie constant
C are estimated to be 4.94 μB, 5.26 μB, and 3.90 μB,
respectively. The magnetic specific heat jump ΔCp at TC is found to
be 12, 3.6, and 10.5 J/mol K for RCo9Si4 with R = Pr, Nd, and Sm,
respectively. Magnetic entropy SM associated with the magnetic ordering
in RCo9Si4 (R = Pr, Nd and Sm) were estimated to vary from 19.15 J/mol K and 14.90 J/mol K.