共 12 条
Tailored magnetic properties of Sm(Zn) substituted nanocrystalline barium hexaferrites
被引:48
作者:
Han Yanbing
[1
,2
]
Sha Jian
[1
]
Sun Lina
[2
]
Tang Quan
[2
]
Lu Qin
[2
]
Jin Hongxiao
[2
]
Jin Dingfeng
[2
]
Bo Hong
[2
]
Ge Hongliang
[2
]
Wang Xinqing
[2
]
机构:
[1] Zhejiang Univ, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China
[2] China Jiliang Univ, Zhejiang Prov Key Lab Magnetism, Coll Mat Sci & Engn, Hangzhou 310018, Zhejiang, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Barium hexaferrite;
Sol-gel synthesis;
Magnetic properties;
RATIO;
LA;
PH;
D O I:
10.1016/j.jallcom.2009.06.143
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Sm and SmZn substituted nanocrystalline barium hexaferrites (Ba1-xSmxFe12O19 and Ba1-xSmxFe12-xZnxO19, x = 0-0.6) were prepared by the sol-gel autocombustion process. X-ray diffraction (XRD) and vibrating sample magnetometer (VSM) were used to characterize the phase composition, crystal structure and magnetic properties of the as-prepared barium hexaferrites. All results indicated that the substitution content (x) critically influenced on the phase composition and magnetic properties. When the substitution content x > 0.2, impurity phases such as alpha-Fe2O3, SmFeO3 and ZnFe2O4 were detected, which diluted and weakened saturation magnetization (M-s). For the Sm-doped samples, owing to the hyperfine field, canting spin, magnetic dilution and impurity phases, M-s increased with x firstly, and then decreased when x > 0.03. On the other hand, the coercivity (Hc) continuously increased with x. Nevertheless, for the SmZn-doped samples, M-s reached maximum when x = 0.06 and Hc almost unchanged with x. Compared the magnetic properties of Sm- and SmZn-doped samples, it was proved that Zn2+ substituted Fe3+ at 4f(2) sites and Sm3+ substituted Ba2+, which changed Fe3+ to Fe2+ at 2a sites in order to satisfy the electroneutrality principle. (C) 2009 Elsevier B.V. All rights reserved.
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页码:348 / 351
页数:4
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