Fe3O4/FeO/CoNi kompozit malzemenin sentezi ve manyetik özelliklerinin incelenmesi

Yıl 2019, Cilt: 25 Sayı: 1, 56 - 59, 26.02.2019

Muharrem Kunduracı

Öz

Fe₃O₄/FeO/CoNikompozit
malzemesi iki aşamalı proses kullanılarak üretilmiştir. Birinci aşamada, oksit
prekürsörü (öncül malzeme) ıslak sentez esaslı Pechini yöntemi kullanılarak düşük
sıcaklıkta üretilmiştir. İkinci aşamada prekürsör malzemesi 500, 600, 700 veya
800 °C’ye hidrojen gazı altında ısıtılarak indirgenmiştir ve metal/oksit
kompozit malzemesi elde edilmiştir. Farklı sıcaklıklarda üretilen malzemelerin
yapısal, morfolojik ve manyetik özellikleri X-ışını kırınımı, tarama elektron
mikroskobu ve titreşen örnek manyetometresi kullanılarak incelenmiştir. 600
°C’den 700 °C’ye geçişte manyetik özelliklerde ani değişiklikler gözlenmiştir.
Doygunluk mıknatıslanması iki katına çıkarken, koersif kuvvet yarıya inmiştir.
Bu değişiklikler manyetik CoNi fazın amorf bir yapıdan kristal bir yapıya
geçişiyle ve Fe₃O₄ fazın parçacık boyutunun yaklaşık
olarak iki katına artmasıyla açıklanmıştır

Anahtar Kelimeler

Yumuşak manyetik kompozit, Hidrojen indirgeme, Pechini

Synthesis of Fe3O4/FeO/CoNi composite material and study of its magnetic properties

Öz

Fe₃O₄/FeO/CoNi
composite materials were produced using a two-step process. In the first step,
oxide precursor was produced at low temperature by wet-synthesis based Pechini
method. In the second step, the precursor was heated to 500, 600, 700 or 800 °C
under reducing hydrogen gas and metal/oxide composite material was obtained.
The structural, morphological and magnetic properties of materials produced at
different temperatures were investigated using X-ray diffraction, scanning
electron microscope and vibrating sample magnetometer. Sudden changes in magnetic
properties were observed during transition from 600 °C to 700 °C. The
saturation magnetization doubled while coercive force was halved. These changes
were explained with the crystallization of magnetic CoNi phase from an
amorphous state and nearly doubling of particle size of Fe₃O₄ phase.

Anahtar Kelimeler

Soft magnetic composite, Hydrogen reduction, Pechini

Kaynakça

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