논문 해외 국제전문학술지(SCI급) Structural, magnetic, and magnetocaloric properties of R2NiMnO6 (R = Eu, Gd, Tb)
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2021-10
- 저자명 김정민공동(참여),구교진,Y. Jo,S.Y. Park,A. Lee,M. Mananwan,이의정,SHINDE KIRAN PRAKASH,박준식
- 학술지명 SCIENTIFIC REPORTS
- 발행처명 NATURE RESEARCH
- 발행국가 해외
- 논문언어 외국어
홈페이지논문 초록 (Abstract)
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 P21/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.