Magnetic and magnetocaloric properties of Gd6(Mn1-xCox)23 compounds (x ≤ 0.3)

JOURNAL OF ALLOYS AND COMPOUNDS

卷:680

Article

Lemoine, Pierric^1,2  Verniere, Anne²  Malaman, Bernard²  Mazet, Thomas² 

[1] Univ Rennes 1, UMR CNRS 6226, Inst Sci Chim Rennes, 263 Ave Gen Leclerc,CS 74205, F-35042 Rennes, France

[2] Univ Lorraine, Fac Sci & Technol, UMR CNRS 7198, Inst Jean Lamour, BP 70239, F-54506 Vandoeuvre Les Nancy, France

关键词: Lanthanide intermetallic compound;    Magnetic properties;    Magnetocaloric properties;    Magnetic entropy change;   

DOI  :  10.1016/j.jallcom.2016.04.198

来源: Elsevier

【 摘 要 】

The magnetic and magnetocaloric properties of the Th6Mn23-type structure Gd-6(Mn1-xCox)(23) (x <= 0.3) compounds are investigated from DC magnetization measurements. The Curie temperature of these ferrimagnetic materials evolves non-continuously with the Co content from T-C = 489 K for x = 0 to T-C = 118 K for x = 0.3. In relation with the lower magnetic moment of Co atoms compared with that of Mn atoms, the Co to Mn substitution leads to a decrease of the maximal magnetization, recorded at 5 K in an applied magnetic field of 9 T, from 54.7 mu(B)/f.u. for x = 0 to 36.3 mu(B)/f.u. for x = 0.3. These materials present an anomalous magnetocaloric effect, characterized by two broad -Delta S-M maxima of moderate magnitude at T-C and around 100 K, yielding to wide magnetocaloric response from T-C down to the lowest temperature, and consequently, a relatively large cooling capacity q(10-350K) (mu(0)Delta H = 5 T) reaching similar to 3.7 J cm(-3) for Gd-6(Mn0.875Co0.125)(23). The results are analyzed and discussed in connection with previously published data. (C) 2016 Elsevier B.V. All rights reserved.

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