| Summary: | In this work, Fe<sub>80-x</sub>M<sub>x</sub>P<sub>13</sub>C<sub>7</sub> (M = Co, Ni; x = 0, 5 and 10 at.%) bulk metallic glasses (BMGs) were prepared, and the effect of the Co/Ni elements substitution for Fe on the magnetocaloric properties of Fe<sub>80</sub>P<sub>13</sub>C<sub>7</sub> BMG has been investigated systematically. The Curie temperature (<i>T</i><sub>C</sub>) of the present Fe-based BMGs increases with the substitution of Fe by Co/Ni. The magnetic entropy change (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>S</mi><mi mathvariant="normal">M</mi></msub></mrow></semantics></math></inline-formula>) of the present Fe-based BMGs increases first and then decreases with the increase of Fe substituted by Co, but monotonically decreases with the increase of Fe substituted by Ni. Among the present Fe-based BMGs, the Fe<sub>75</sub>Co<sub>5</sub>P<sub>13</sub>C<sub>7</sub> BMG exhibits the maximum <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>S</mi><mi mathvariant="normal">M</mi></msub></mrow></semantics></math></inline-formula> value of 5.21 J kg<sup>−1</sup> K<sup>−1</sup> at an applied field of 5 T, which is the largest value among Fe-based amorphous alloys without any rare earth elements reported so far. The present Fe-based BMGs exhibit the large glass forming ability, tunable <i>T</i><sub>C</sub> and enhanced <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>S</mi><mi mathvariant="normal">M</mi></msub></mrow></semantics></math></inline-formula> value, which are beneficial for magnetic refrigerant materials.
|
|---|
