Magnetic entropy change and magnetocaloric effect of DyNiSi3, Dy2Ni3Si5, DyNiSi2 and HoNiSi0.33Ga67 antiferromagnetsстатья
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Дата последнего поиска статьи во внешних источниках: 10 апреля 2019 г.
Аннотация:Magnetic properties, magnetic entropy change and magnetocaloric effect of the polycrystalline SmNiGe3-type DyNiSi3, U2Co3Si5-type Dy2Ni3Si5, CeNiSi2-type DyNiSi2 and CeCu2-type HoNiSi0.33Ga0.67 antiferromagnets have been studied by means of bulk magnetization measurements. In field of 100 Oe DyNiSi3, Dy2Ni3Si5, DyNiSi2 and HoNiSi0.33Ga0.67 show Néel temperature (TN) of 21 K, 19 K, 9 K and 4 K, respectively. At 2 K, above critical field (Hcrit) of 28 kOe for DyNiSi3, 10 kOe for Dy2Ni3Si5, 25 kOe for DyNiSi2 and ~1 kOe for HoNiSi0.33Ga0.67 they are soft ferromagnets and HoNiSi0.33Ga0.67 shows ferromagnetic ordering below TC = 5 K in a field of 5 kOe.
Magnetic entropy changes (deltaSm) of DyNiSi3, Dy2Ni3Si5, DyNiSi2 and HoNiSi0.33Ga0.67 exhibit high-temperature negative and low temperature positive components around Néel temperature up to critical field with decreasing and disappearance of positive component of deltaSm above critical field, which indicates the transformation from antiferromagnetic to ferromagnetic states.
From these compounds, HoNiSi0.33Ga0.67 shows largest magnetic entropy change of -15.4 J/kg*K at 8 K for a field change of 0-50 kOe.