Influence of Addition of CaO and SiO2 in Microstructure of Hexaferrite BaXSr1-XFe12O19

Yuri Mikael dos Santos Alves; Cláudio Henrique Araújo Pereira; Francisco Werley Cipriano Farias; Francisca Maria Martins Pereira; Maria das Dores Bandeira Barroso; Juscelino Chaves Sales; Antonio Sérgio Bezerra Sombra

doi:10.4028/www.scientific.net/MSF.912.21

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HomeMaterials Science ForumMaterials Science Forum Vol. 912Influence of Addition of CaO and SiO2 in...

Influence of Addition of CaO and SiO₂ in Microstructure of Hexaferrite Ba_XSr_1-XFe₁₂O₁₉

Abstract:

This study is aimed to verify the influence of adding SiO₂ and CaO in the sintering temperature of hexaferrite, obtained by standard ceramic methods. The powders were weighed in stoichiometric amounts, milled for 1 hour under a high energy mill and calcined at 1000 °C/24h. To study the effect of concentration of additives on the microstructure of the hexaferrite samples were prepared without additives, and with simultaneous addition of SiO₂ and CaO, wherein the total concentration of the additive was 1%. The morphology and particle size of the samples were determined by SEM and the crystal structure was determined by XRD and the phases were quantified by the Rietveld method. The XRD data showed the predominance of magnetoplumblico structure with hexagonal symmetry and space group P63/mmc. All samples have distributed grain heterogeneously, clustered in different masses, with acute forms and some of them featuring hexagonal shapes with different sizes.

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Periodical:

Materials Science Forum (Volume 912)

Pages:

21-26

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.912.21

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Online since:

January 2018

Authors:

Yuri Mikael dos Santos Alves, Cláudio Henrique Araújo Pereira, Francisco Werley Cipriano Farias, Francisca Maria Martins Pereira, Maria das Dores Bandeira Barroso, Juscelino Chaves Sales, Antonio Sérgio Bezerra Sombra

Keywords:

Grain Size, Hexaferrites Type M, Sintering Additives, Sintering Temperature

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