Structural, magnetic, and magnetocaloric properties of R2NiMnO6 (R = Eu, Gd, Tb)

被引：40
作者：
Shinde, K. P. [1 ]
Lee, E. J. [1 ]
Manawan, M. [2 ]
Lee, A. [3 ]
Park, S-Y [3 ]
Jo, Y. [3 ]
Ku, K. [1 ]
Kim, J. M. [1 ]
Park, J. S. [1 ]
机构：
[1] Hanbat Natl Univ, Dept Mat Sci & Engn, Daejeon 34158, South Korea
[2] Univ Pertahanan Indonesia, Fak Teknol Pertahanan, Bogor 16810, Indonesia
[3] Korea Basic Sci Inst, Ctr Sci Instrumentat, Daejeon 34133, South Korea
来源：
SCIENTIFIC REPORTS | 2021年 / 11卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
DOUBLE-PEROVSKITE; CRITICAL-BEHAVIOR; ROOM-TEMPERATURE; DY; ND; HO; REFRIGERATION; MANGANITE; ORDER; PR;
D O I：
10.1038/s41598-021-99755-2
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The crystal structure, cryogenic magnetic properties, and magnetocaloric performance of double perovskite Eu2NiMnO6 (ENMO), Gd2NiMnO6 (GNMO), and Tb2NiMnO6 (TNMO) ceramic powder samples synthesized by solid-state method have been investigated. X-ray diffraction structural investigation reveal that all compounds crystallize in the monoclinic structure with a P2(1)/n space group. A ferromagnetic to paramagnetic (FM-PM) second-order phase transition occurred in ENMO, GNMO, and TNMO at 143, 130, and 112 K, respectively. Maximum magnetic entropy changes and relative cooling power with a 5 T applied magnetic field are determined to be 3.2, 3.8, 3.5 J/kgK and 150, 182, 176 J/kg for the investigated samples, respectively. The change in structural, magnetic, and magnetocaloric effect attributed to the superexchange mechanism of Ni2+-O-Mn3+ and Ni2+-O-Mn4+. The various atomic sizes of Eu, Gd, and Tb affect the ratio of Mn4+/Mn3+, which is responsible for the considerable change in properties of double perovskite.
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页数：12
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