Magnetic Properties and Magnetocaloric Effect in Layered NdMn1.9Ti0.1Si2

Atom Indonesia

S.J. Kennedy¹  J.L. Wang²  M.F. Md Din³  S.X. Dou⁴  S.J. Campbell⁵ 

[1] Bragg Institute, ANSTO, Lucas Heights, NSW 2234, Australia;Institute of Superconducting and Electronic Material, University of Wollongong, Wollongong, NSW 2522, Australiaand Bragg Institute, ANSTO, Lucas Heights, NSW 2234, Australia;Institute of Superconducting and Electronic Material, University of Wollongong, Wollongong, NSW 2522, Australia and 4Department Electric and Electronic Engineering, National Defence University of Malaysia, 57000 Kuala Lumpur, Malaysia;Institute of Superconducting and Electronic Material, University of Wollongong, Wollongong, NSW 2522, Australia;School of Physical, Environmental and Mathematical Sciences, UNSW, Canberra, ACT 2600, Australia;

关键词: Neutron diffraction;    X-ray diffraction;    Magnetocaloric effect;    First order magnetic transition;    Small hysteresis issue;   

DOI  :  

来源: DOAJ

【 摘 要 】

The structural and magnetic properties of the NdMn1.9Ti0.1Si2 compund have been studied by high-intensity x-ray and high-resolution neutron powder diffraction, specific heat, dc magnetization, and differential scanning calorimetry measurements over the temperature range of 3-450 K. The Curie temperature and Néel temperature of layered NdMn1.9Ti0.1Si2 are indicated as TC ~ 22 K and TN ~ 374 K respectively. The first order magnetic transition from antiferromagnetic [AFil-type] to ferromagnetic [F(Nd)+Fmc] around TC is found in layered NdMn1.9Ti0.1Si2 and is associated with large magnetocaloric effect. This behavior has been confirmed as a contribution of the magnetostructural coupling by using neutron and x-ray powder diffraction. The magnetic entropy change –ΔSM ~ 15.3 J kg-1 K-1 and adiabatic temperature change ΔTad ~ 4.7 K have been determined using magnetization and specific heat measurement under 0-5 T applied fields. This compound exhibits almost no thermal and magnetic hysteresis, thus potentially applicable in low temperature region for magnetic refrigerator material

【 授权许可】

Unknown