Ni-substitution effect on the properties of Ba0.5Sr1.5Zn2-xNixFe12O22 powders

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:505

Article

Koutzarova, Tatyana¹  Kolev, Svetoslav¹  Krezhov, Kiril¹  Georgieva, Borislava¹  Ghelev, Chavdar¹  Kovacheva, Daniela²  Vertruyen, Benedicte³  Closset, Raphael³  Tran, Lan Maria⁴  Babij, Michal⁴  Zaleski, Andrzej J.⁴ 

[1] Bulgarian Acad Sci, Inst Elect, 72 Tsarigradsko Chaussee, Sofia 1784, Bulgaria

[2] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, Acad Georgi Bonchev Str,Bld 11, BU-1113 Sofia, Bulgaria

[3] Univ Liege, Greenmat, Chem Dept, 11 Allee 6 Aout, B-4000 Liege, Belgium

[4] Polish Acad Sci, Inst Low Temp & Struct Res, Ul Okolna 2, PL-250422 Wroclaw, Poland

关键词: Y-type hexaferrites;    Sol-gel auto-combustion;    Ni-substitution;    ac susceptibility;    Magnetic properties;    Magnetic phase transitions;   

DOI  :  10.1016/j.jmmm.2020.166725

来源: Elsevier

【 摘 要 】

We consider the influence of the magnetic cation (Ni2+) substitution on the structural and magnetic properties of Ba0.5Sr1.5Zn2-xNixFe12O22 (x = 0.8, 1, 1.5) powders. The powders were synthesized by using the citric-acid sol-gel auto-combustion method. Their ac-magnetization was measured in an ac-magnetic field with an amplitude of 10 Oe and a frequency of 1000 Hz to detect any magnetic phase transitions. A strong influence of the Ni-substitution on the magnetic properties was thus observed. A magnetic phase transition from a helicoidal to a ferrimagnetic spin order at 284 K was observed for the sample Ba0.5Sr1.5Zn0.5Ni1.5Fe12O22. The magnetic-phase transition from conical spin order to hellicoidal spin order was registered at 149 K and 177 K for x = 0.8 and x = 1, respectively. Triple hysteresis loops were observed for all samples at 4.2 K, which indicates the presence of two kinds of ferromagnetic states with different magnetization values.

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