Ferrite-based material as a permanent magnet for components of electrical generators
Sebayang, Perdamean; Masbah, Muljadi; Siregar, R T; Walyo, Tomi Budi; Sebayang, Perdamean; Research Center for Physics, Indonesia Institute of Sciences, Serpong Puspiptek-Tangerang 15314, Indonesia; Masbah, Muljadi; Research Center for Physics, Indonesia Institute of Sciences, Serpong Puspiptek-Tangerang 15314, Indonesia; Siregar, R T; Research Center for Physics, Indonesia Institute of Sciences, Serpong Puspiptek-Tangerang 15314, Indonesia; Walyo, Tomi Budi; Research Center for Physics, Indonesia Institute of Sciences, Serpong Puspiptek-Tangerang 15314, Indonesia
Журнал:
Advances in Natural Sciences: Nanoscience and Nanotechnology
Дата:
2011-12-01
Аннотация:
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<sub>2</sub>O<sub>3</sub> and BaCO<sub>3</sub> as starting materials with mole ratio n=BaO:Fe<sub>2</sub>O<sub>3</sub>=1: 6. The mixture is calcinated at 1100 °C and two crystal structures, BaOFe<sub>2</sub>O<sub>3</sub> and BaFe<sub>12</sub>O<sub>19</sub>, were obtained with particle size of about 0.5–1.5 μm. 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<sup>-1</sup>; density 3.43 g cm<sup>-3</sup> and porosity 9.16%. On the other hand, the cooprecipitation method uses FeCl<sub>3</sub> and BaCl<sub>2</sub> solution with mole ratio n=BaCl<sub>2</sub>:FeCl<sub>3</sub>=1:6. After the calcination at 900 °C and higher temperatures a single crystal structure of BaO·6Fe<sub>2</sub>O<sub>3</sub> 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<sup>-1</sup>; density 4.34 g cm<sup>-3</sup> and porosity 3.36%.
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