EXPERIMENTAL ANALYSIS OF SUBSTITUTED NIZNBE FERRITE

Jozef Sláma - Anna Grusková - Elemír Ušák - Martin Šoka - Rastislav Dosoudil - Vladimír Jančárik

   The (Ni_0.3Zn_0.7)_1-xBe_xFe₂O₄ ferrites where Be²⁺ ionic content was changed from x = 0.05 up to 0.5 have been synthesised by the ceramic method and annealed at 1250°C for 6 hours. Samples were characterised by means of X-ray diffraction, Mössbauer spectroscopy and temperature dependences of magnetic susceptibility χ(T). With increasing of Be²⁺ ionic content, the Curie temperature T_C firstly increased up to x = 0.25 and then decreased; for x ≥ 0.4 T_C increased again. The increase of Be²⁺ ionic content tends to reduce the size of particles, thus influencing the susceptibility determined mainly by the particle size.

Keywords: substituted NiZn ferrites, Curie temperature, magnetic susceptibility

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