Crystal structure and magnetic properties of disordered alloy ErGa3- xMnx

doi:10.1088/1674-1056/28/8/086101

中国物理B ›› 2019, Vol. 28 ›› Issue (8): 86101-086101.doi: 10.1088/1674-1056/28/8/086101

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Crystal structure and magnetic properties of disordered alloy ErGa_{3- x}Mn_x

Cong Wang(王聪), Yong-Quan Guo(郭永权), Shuo-Wang Yang(杨硕望)

School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

收稿日期:2019-04-19 修回日期:2019-06-17 出版日期:2019-08-05 发布日期:2019-08-05
通讯作者: Yong-Quan Guo E-mail:yqguo@ncepu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11274110).

Crystal structure and magnetic properties of disordered alloy ErGa_{3- x}Mn_x

Cong Wang(王聪), Yong-Quan Guo(郭永权), Shuo-Wang Yang(杨硕望)

School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Received:2019-04-19 Revised:2019-06-17 Online:2019-08-05 Published:2019-08-05
Contact: Yong-Quan Guo E-mail:yqguo@ncepu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11274110).

摘要/Abstract

摘要： ErGa_3-xMn_x disordered alloy is successfully prepared by the vacuum arc melting technology, and the crystal structure and magnetic properties are investigated by using the x-ray diffraction and magnetic measurements. The Rietveld structural analysis indicates that the ErGa_3-xMn_x crystallizes into a cubic structure with space group of Pm3m in Mn doping range of x=0-0.1. However, the disordered alloy with structural formula of Er_0.8Ga₂^I(Ga^Ⅱ, Mn)_0.4 as the second phase is separated from cubic phase for the samples with x=0.2 and 0.3, which is induced by substituting the (Ga^Ⅱ, Mn)-(Ga^Ⅱ, Mn) pair at 2e crystal position for the rare earth Er at 1a site. The lattice parameters tend to increase with Mn content increasing due to the size effect at Ga (1.30 Å) site by substituting Mn (1.40 Å) for Ga. The paramagnetic characteristic is observed by doping Mn into ErGa₃ at room temperature. With Mn content increasing from x=0 to 0.1, the magnetic susceptibility χ tends to increase. This phenomenon can be due to the increase of effective potential induced by doping Mn into ErGa₃. However, the magnetic susceptibility χ continues to decrease with the increase of Mn content in a range of x>0.2, which is due to the phase separation from the cubic Er(Ga, Mn)₃ to the hexagonal Er_0.8Ga₂(Ga, Mn)_0.4.

关键词: ErGa_3-xMn_x, Rietveld structure refinement, magnetic transport

Abstract: ErGa_3-xMn_x disordered alloy is successfully prepared by the vacuum arc melting technology, and the crystal structure and magnetic properties are investigated by using the x-ray diffraction and magnetic measurements. The Rietveld structural analysis indicates that the ErGa_3-xMn_x crystallizes into a cubic structure with space group of Pm3m in Mn doping range of x=0-0.1. However, the disordered alloy with structural formula of Er_0.8Ga₂^I(Ga^Ⅱ, Mn)_0.4 as the second phase is separated from cubic phase for the samples with x=0.2 and 0.3, which is induced by substituting the (Ga^Ⅱ, Mn)-(Ga^Ⅱ, Mn) pair at 2e crystal position for the rare earth Er at 1a site. The lattice parameters tend to increase with Mn content increasing due to the size effect at Ga (1.30 Å) site by substituting Mn (1.40 Å) for Ga. The paramagnetic characteristic is observed by doping Mn into ErGa₃ at room temperature. With Mn content increasing from x=0 to 0.1, the magnetic susceptibility χ tends to increase. This phenomenon can be due to the increase of effective potential induced by doping Mn into ErGa₃. However, the magnetic susceptibility χ continues to decrease with the increase of Mn content in a range of x>0.2, which is due to the phase separation from the cubic Er(Ga, Mn)₃ to the hexagonal Er_0.8Ga₂(Ga, Mn)_0.4.

Key words: ErGa_3-xMn_x, Rietveld structure refinement, magnetic transport

中图分类号: (X-ray diffraction)

61.05.cp

61.50.-f (Structure of bulk crystals) 63.50.Gh (Disordered crystalline alloys) 87.80.Lg (Magnetic and paramagnetic resonance)

王聪, 郭永权, 杨硕望. Crystal structure and magnetic properties of disordered alloy ErGa_{3- x}Mn_x[J]. 中国物理B, 2019, 28(8): 86101-086101.

Cong Wang(王聪), Yong-Quan Guo(郭永权), Shuo-Wang Yang(杨硕望). Crystal structure and magnetic properties of disordered alloy ErGa_{3- x}Mn_x[J]. Chin. Phys. B, 2019, 28(8): 86101-086101.

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Crystal structure and magnetic properties of disordered alloy ErGa_{3- x}Mn_x

Crystal structure and magnetic properties of disordered alloy ErGa_{3- x}Mn_x

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