Open AccessFerrite-based material as a permanent magnet for components of electrical generators
Author(s) -
Perdamean Sebayang,
Muljadi Masbah,
R. Siregar,
Tomi Budi Walyo
Publication year - 2011
Publication title -
advances in natural sciences nanoscience and nanotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.476
H-Index - 40
ISSN - 2043-6262
DOI - 10.1088/2043-6262/2/4/045016
Subject(s) - materials science , sintering , remanence , calcination , porosity , ferrite (magnet) , magnet , analytical chemistry (journal) , particle size , crystal structure , crystal (programming language) , saturation (graph theory) , magnetization , mineralogy , nuclear magnetic resonance , metallurgy , crystallography , composite material , chemistry , magnetic field , chromatography , biochemistry , physics , mathematics , quantum mechanics , combinatorics , computer science , programming language , catalysis
A permanent magnet based on ferrite for use as components of electrical generators has been fabricated by two different methods: solid–solid mixing and cooprecipitation. The conventional solid–solid mixing method uses Fe 2 O 3 and BaCO 3 as starting materials with mole ratio n = BaO : Fe 2 O 3 =1: 6. The mixture is calcinated at 1100 ° C and two crystal structures, BaOFe 2 O 3 and BaFe 12 O 19 , were obtained with particle size of about 0.5–1.5 μ m . Sintering at 1100 ° C was followed by a magnetization process. Measurements give the following physical parameter values: remanence, Br =0.0792 T ; magnetic saturation, Bs =1.21 T ; coersivity, Hc =44.7 kA m -1 ; density 3.43 g cm -3 and porosity 9.16%. On the other hand, the cooprecipitation method uses FeCl 3 and BaCl 2 solution with mole ratio n = BaCl 2 : FeCl 3 =1:6. After the calcination at 900 ° C and higher temperatures a single crystal structure of BaO·6Fe 2 O 3 is formed with particle size of about 30–60 nm. The optimum sintering temperature for the formation of this single phase crystal structure is 1050 ° C . The physical parameters of the final product have the following values: Br =0.2673 T ; Bs =1.42 T ; Hc =89.4 kA m -1 ; density 4.34 g cm -3 and porosity 3.36%.