中国物理B ›› 2009, Vol. 18 ›› Issue (11): 5055-5060.doi: 10.1088/1674-1056/18/11/074

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Structures and magnetic anisotropy of β-Mn2V2O7 crystals synthesized by the molten salt method

周传仓, 刘发民, 丁芃   

  1. Department of Physics, School of Physics and Nuclear Energy Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • 收稿日期:2009-02-22 修回日期:2009-05-22 出版日期:2009-11-20 发布日期:2009-11-20

Structures and magnetic anisotropy of $\beta$-Mn2V2O7 crystals synthesized by the molten salt method

Zhou Chuan-Cang(周传仓),Liu Fa-Min(刘发民)†, and Ding Peng(丁芃)   

  1. Department of Physics, School of Physics and Nuclear Energy Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2009-02-22 Revised:2009-05-22 Online:2009-11-20 Published:2009-11-20

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摘要： β-Mn2V2O_7 crystals with strip shape are successfully prepared by the molten salt method in a closed crucible, and are characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area of electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM). The results indicate that the sample is of the β -Mn2V2O7 crystal with monoclinic symmetry, level natural cleavage facets and directional growth. Magnetic properties are measured by vibration sample magnetometry (VSM) at room temperature, and the magnetic hysteresis loop indicates that the β-Mn2V2O7 has anti-ferromagnetic properties with low coercive force and remnant magnetization. The magnetic measurement results in different directions exhibit that the β -Mn2V2O7 has magnetic anisotropy, which is due to the fact that the magnetic interaction energy of the β -Mn2V2O7 is lowest only when the electron configuration is in a certain direction.

Abstract: $\beta$-Mn2V2O_7 crystals with strip shape are successfully prepared by the molten salt method in a closed crucible, and are characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area of electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM). The results indicate that the sample is of the $\beta$-Mn2V2O7 crystal with monoclinic symmetry, level natural cleavage facets and directional growth. Magnetic properties are measured by vibration sample magnetometry (VSM) at room temperature, and the magnetic hysteresis loop indicates that the $\beta$-Mn2V2O7 has anti-ferromagnetic properties with low coercive force and remnant magnetization. The magnetic measurement results in different directions exhibit that the $\beta$-Mn2V2O7 has magnetic anisotropy, which is due to the fact that the magnetic interaction energy of the $\beta$-Mn2V2O7 is lowest only when the electron configuration is in a certain direction.

Key words: $\beta$-Mn2V2O7, molten salt synthesis, magnetic anisotropy

中图分类号:  (Magnetic anisotropy)

  • 75.30.Gw
61.66.Fn (Inorganic compounds) 81.20.-n (Methods of materials synthesis and materials processing) 61.50.Ah (Theory of crystal structure, crystal symmetry; calculations and modeling) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 75.50.Ee (Antiferromagnetics)