CeNi3-type rare earth compounds: crystal structure of R3Co7Al2 ( R=Y, Gd-Tm) and magnetic properties of {Gd-Er}3Co7Al2, {Tb, Dy}3Ni8Si and Dy3Co7.68Si1.32

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:426

Article

Morozkin, A. V.¹  Yapaskurt, V. O.²  Nirmala, R.³  Quezado, S.⁴  Malik, S. K.⁴ 

[1] Moscow MV Lomonosov State Univ, Dept Chem, Leninskie Gory,House 1,Bldg 3,GSP 1, Moscow 119991, Russia

[2] Moscow MV Lomonosov State Univ, Geol Fac, Dept Petrol, Leninskie Gory, Moscow 119991, Russia

[3] Indian Inst Technol Madras, Chennai 600036, Tamil Nadu, India

[4] Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, BR-59082970 Natal, RN, Brazil

关键词: Rare-earth compounds;    Crystal structure;    Magnetic properties;    Magnetocaloric effect;   

DOI  :  10.1016/j.jmmm.2016.10.134

来源: Elsevier

【 摘 要 】

The crystal structure of new CeNi3-type {Y, Gd-Tm}(3)Co7Al2 (P63/mmc. N 194, hP24) compounds has been established using powder X-ray diffraction studies. The magnetism of Tb3Ni8Si and Dy3Ni8Si is dominated by rare earth sublattice and the magnetic properties of R3Co7Al2 (R = Gd-Er) and Dy3Co7.68Si1.32 are determined by both rare earth and cobalt sublattices. Magnetization data indicate ferromagnetic ordering of {Tb, Dy}(3)Ni8Si at 32 K and 21 K, respectively. Gd3Co7Al2 and Tb3Co7Al2 exhibit ferromagnetic ordering at 309 K and 209 K, respectively, whereas Dy3Co7Al2, Ho3Co7Al2, Er3Co7Al2 and Dy3Co7.68Si1.32 show a field dependent ferromagnetic- like ordering at 166 K, 124 K, 84 K and 226 K, respectively followed by a low temperature transition at 34 K for Dy3Co7Al2, 18 K for Ho3Co7Al2, 56 K for Er3Co7Al2, 155 K and 42 K for Dy3Co7.68Si1.32. Among these compounds, Dy3Ni8Si shows largest magnetocaloric effect (isothermal magnetic entropy change) of-11.6 J/kg . K at 18 K in field change of 50 kOe, whereas Tb3Co7Al2, Dy3Co7Al2 and Dy3Co7.68Si1.32 exhibit best permanent magnet properties in the temperature range of 2-5 K with remanent magnetization of 11.95 mu B/fu, 12.86 mu B/fu and 14.4 mu B/fu, respectively and coercive field of 3.0 kOe, 1.9 kOe and 4.4 kOe, respectively.

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