Investigation of Ferromagnetism and Growth Correlation of Transition Metal Doped ZnO

Öz

In this study, a series of 3d transition metal (TM) (Co, Ni and Fe) doped ZnO particles synthesized by simple co-precipitation method. Structural, morphological and magnetic properties were investigated to determine correlation between growth process and ferromagnetism of metal doped ZnO samples. All samples had ZnO hexzagonal würtzite structure and slightly shift of ZnO indexed peaks was observed by TM incorporation in ZnO. Although ZnO samples had granular forms, agglomerative forms had emerged in TM:ZnO samples due to the fast growth process. The pure ZnO sample transformed paramagnetic to ferromagnetic by TM incorporation due to carrier mediated exchange interaction between TM ions. The results demonstated that doping with Fe3+ ions in ZnO structure had enhanced ferromagnetism although fast growth and high particle agglomeration.

Anahtar Kelimeler

• transition metal
• co-precipitation
• structural
• ferromagnetic
• ZnO
• structural

Geçiş Metali Katkılı ZnO’in Ferromanyetizma ve Büyüme Korelasyonunun İncelenmesi

Öz

Bu çalışmada, bir dizi 3d geçiş metali (TM) (Co, Ni ve Fe) katkılı ZnO parçacıkları basit çöktürme yöntemi ile sentezlenmiştir. GM katkılı ZnO örneklerinin manyetik özelliklerini incelemek için yapısal, morfolojik ve manyetik çalışmalar yapılmıştır. Kimyasal bileşimde Zn, O ve katkı elementlerin yüzdesi elementel analiz tarafından doğrulandı. Katkılı iyonlar Zn2+ iyonları ile ikame edilirken, ZnO yapısındaki dramatik değişim GM katkısı ile saptandı. Yüzey morfolojilerinden nanokümelerin oluşumu gösterildi. FTIR spektrumu, saf ve GM katkılı ZnO oluştuğunun bir kanıtıdır. GM iyonları arasındaki değişim etkileşimi nedeniyle Fe, Ni ve Co katkısı ile paramanyetik durumdan ferromanyetikliğe saf ZnO örneği geçmiştir. Fe: ZnO örnekleri ZnO kristal kalitesini düşürmüş ve yığılma yüzey görüntüleri tespit edilmiş olsa da, ferromanyetizmanın ZnO'ya Fe katkısıi ile artması ilginçtir.

Anahtar Kelimeler

• yapısal
• geçiş metali
• ZnO
• ferromanyetik
• çöktürme

Kaynakça

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