MgZn2-type Ho, Er, Tm}FeGa rare earth compounds: Crystal structure and magnetic propertiesстатья
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Дата последнего поиска статьи во внешних источниках: 21 сентября 2017 г.
Аннотация:The crystal structure of new hexagonal MgZn2-type {Ho, Tm}FeGa compounds (space group P63/mmc, N 194, hP12) has been established using powder X-ray diffraction studies. The magnetic properties of polycrystalline MgZn2-type ErFeGa compound have been studied using bulk magnetization data. ErFeGa exhibits ferromagnetic ordering at TC = 77 K and field sensitive antiferromagnetic-like ordering at Tm ~ 58 K in field of 100 Oe and Tm ~ 10 K in field of 5 kOe. The paramagnetic susceptibility follows Curie-Weiss law with effective paramagnetic moment per formula unit (Meff/fu) of 9.59 mB and paramagnetic Weiss temperature (OP) of 27 K.
At 2 K, ErFeGa exhibits hard magnetic properties with remanent magnetization per formula unit (Mres/fu) of 3.7 mB, coercive field (Hcoer) of 8.2 kOe and critical field (Hcrit) of ~9.6 kOe.
The magnetocaloric effect of ErFeGa has been calculated in terms of isothermal magnetic entropy change (dSm) and maximum dSm values are -5.5 J/kg*K for a field change of 0-50 kOe (relative cooling power RCP50kOe ~ 410 J/kg), -13.0 J/kg*K for a field change of 0-140 kOe (RCP140kOe ~ 1230 J/kg) at 70 K and +1.7 J/kg*K for a field change of 0-10 kOe at 10 K (RCP10kOe ~ 34 J/kg).