Details

Autor(en) / Beteiligte

• Yanbing, Han
• Sha, Jian
• Lina, Sun
• Quan, Tang
• Qin, Lu
• Hongxiao, Jin
• Dingfeng, Jin
• hong, Bo
• Hongliang, Ge
• Wang, Xinqing

Titel

Tailored magnetic properties of Sm(Zn) substituted nanocrystalline barium hexaferrites

Ist Teil von

• Journal of alloys and compounds, 2009-11, Vol.486 (1), p.348-351

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2009

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Sm and SmZn substituted nanocrystalline barium hexaferrites (Ba 1− x Sm x Fe 12O 19 and Ba 1− x Sm x Fe 12− x Zn x O 19, 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 α-Fe 2O 3, SmFeO 3 and ZnFe 2O 4 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 Zn 2+ substituted Fe 3+ at 4 f 2 sites and Sm 3+ substituted Ba 2+, which changed Fe 3+ to Fe 2+ at 2 a sites in order to satisfy the electroneutrality principle.