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Magnetodielectric Properties of Transformer Oil Based Magnetic Fluids

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Timko M., Kopcansky P., Molcan M., Tomco L., Marton K., Molokac S., Rybar P., Stoian F., Holotescu S., Taculescu A.

Acta Physica Polonica A

2012

vol. 121

issue 5-6

1253-1256

This contribution is devoted to study of dielectric and magnetodielectric properties in transformer oil based magnetic fluid. The dielectric permittivity and their anisotropy at various mutual orientation electric (50 Hz) and magnetic field were shown at the different volume concentrations of nanoparticles at room temperature. The linear increase of dielectric constant with volume concentration was confirmed which is in good agreement with the theoretical Maxwell prediction. The dielectric anisotropy factor g(B, ω) is very close to g=1. The values of permittivity increased with the increase of volume fraction of magnetite nanoparticles. The highest value of anisotropy characterized by deviation of permittivity Δε=ε_{∥} - ε_{⊥} was found for the highest volume concentration which could mean that no aggregation of magnetite nanoparticles had appeared.

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1 Acta Physica Polonica A

1 2012

1 Holotescu S.

1 Kopcansky P.

1 Marton K.

1 Molcan M.

1 Molokac S.

1 Rybar P.

1 Stoian F.

1 Taculescu A.

1 Timko M.

1 Tomco L.

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Magnetodielectric Properties of Transformer Oil Based Magnetic Fluids