Abstract
The europium-based intermetallic compounds EuAgZn, EuAgCd, EuPtZn and EuAuCd were synthesized and their magnetic properties and magnetocaloric performances were systematically studied. EuAgZn and EuAgCd compounds crystallize in a KHg2-type structure belonging to space group Imma, whereas EuPtZn and EuAuCd crystallize in a TiNiSi-type structure belonging to space group Pnma. The four compounds contain stable divalent europium and order ferromagnetically with Curie temperatures of TC ~29, 27, 20 and 22 K for EuAgZn, EuAgCd, EuPtZn and EuAuCd, respectively. A considerable tunable reversible MCE can be observed accompanied by a second-order magnetic transition. For the field change of 0–2 and 0–5 T, the −ΔSΜmax values are evaluated to be 7.7, 7.2, 8.2, 8.0 and 14.9, 13.5, 15.3, 13.7 J/kgK for EuAgZn, EuAgCd, EuPtZn and EuAuCd, respectively.
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