M-type Barium Hexaferrite with Excessive Divalent Iron Synthesized by Spark Plasma Sintering Method

doi:10.3724/sp.j.1077.2009.00586

Abstract

Abstract: The precursor of M-type barium hexaferrite (BaM) with excessive divalent iron BaFe³⁺_11.8Fe²⁺_0.3O₁₉ was prepared by chemical coprecipitation process in Ar atmosphere. The phase compositions, microstructures, and densities of sintered products synthesized by spark plasma sintering (SPS) method were investigated with XRD, SEM and Archimedes methods. The optimizing SPS condition for synthesizing singlephase and highcompactness BaM materials with excessive divalent iron is holding for 30min at 850℃ and 10MPa. The crystalline reaction process is composed of the decomposition of the precursor into α-Fe₂O₃ and Fe₃O₄ or γ-Fe₂O₃ at low temperature and the crystallization of BaM with excessive Fe²⁺ at hightemperature, without intermediate phase BaFe₂O₄ forming in the whole process. Saturation magnetization and coercivity of singlephase BaM materials with excessive divalent iron are of 58.2A·m²·kg^-1 and 255kA·m^-1, respectively, which imply that the excessive divalent irons spin upward at 2a site in FeO₆ octahedron.

Key words: M-type barium hexaferrite with excessive divalent iron, spark plasma sintering, crystalline mechanism, magnetic property

CLC Number:

O482

WEI Ping,ZHAO Wen-Yu,WU Xiao-Yan,ZHANG Qing-Jie. M-type Barium Hexaferrite with Excessive Divalent Iron Synthesized by Spark Plasma Sintering Method[J]. Journal of Inorganic Materials, DOI: 10.3724/sp.j.1077.2009.00586.

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