Mehmet Faruk EBEOĞLUGİL

Manyet Teknolojisi için Sol-jel Tekniği Kullanılarak LaFeO3 İnce Film Üzerine İncelemeler

Bu çalışmada, manyet teknolojisi için Lantanyum Ferrit (LaFeO3) ince filmler sol-jel yöntemi kullanılarak hazırlanmıştır. Bu kapsamda, düşük temas açısına sahip başlangıç çözeltileri metanol çözücüsü ve sitrik asit kompleksleşme ajanı kullanılarak ilgili katyonların (La, Fe) tümü nitrat tuzlarından sentezlenmiştir. Elde edilen jel filmler, hava ortamında 500 °C de 10 dakika boyunca ısıl işlem ile kurutulmuştur. Oksit ince filmler hava ortamında 850 oC'de 60 ve 120 dakika ve 1000 oC'de 120 dakika süreyle tavlandı. endotermik ve ekzotermik reaksiyonların gözlendiği DTA / TG sonuçlarında 29 oC ve 450 oC arasındaki sıcaklıklarda çözücü uzaklaştırma, karbon esaslı materyallerin yanması ve La ve Fe'nin oksitlenmesi tespit edilmiştir. 850 °C ve 1000 °C'de tavlanmış La-Fe başlangıç film spektrumu, organik ve hidroksillerin görüldüğü absorpsiyon bantlarının yok olduğunu göstermektedir. LaFeO3 fazının yanı sıra XRD sonuçlarından düşük şiddetli saf perovskite pikler elde edilmiştir. Homojen yapılı yüzey morfolojisine sahip film gözlenmiştir. Elde edilen örneklerin termal, faz, mikro yapısal ve manyetik özellikleri TG / DTA, FTIR, XRD, SEM, XPS, ıslatma açısı ölçüm cihazı ve VSM ile belirlenmiştir. Sonuçlar sürekli Perovskite çok kristalli filmlerin (100) yönlü Si altlıklar üzerine büyütüldüğünü göstermiştir. Buna ek olarak, filmler güçlü ferromanyetik davranış göstermektedir

Investigations on LaFeO3 Thin Film Using Sol–Gel Technique for Magnet Technology

In this study, lanthanum Ferrite (LaFeO3) thin films were prepared by sol-gel method for magnet technology. With this context, precursor solutions with low contact angles were synthesized from all nitrate salts of the respective cations (La, Fe), using methanol as solvent and citricacid as chelating agents. The obtained gel films were dried at heat-treated at 500 oC for 10 minutes in air. The oxide thin films were annealed at 850 C for 60 and 120 minutes and 1000 oC for 120 minutes in air. DTA/TG results revealed that endothermic and exothermic reactions are observed at temperature between 29 oC and 450 oC due to solvent removal, combustion of carbon based materials and oxidation of La and Fe. The spectrum of La-Fe precursor film annealed at 850oC and 1000 oC shows an absence of absorption bands corresponding to organics and hydroxyls. LaFeO3 phase was found as well as pure perovskitewith low intensity from XRD patterns. It was found that surface morphologies of the film with homogeneous structures. The thermal, phase, microstructural and magnetic properties of the obtained samples were determined by TG/DTA, FTIR, XRD, SEM, XPS, wetting angles and VSM. The results show that sustained perovskite polycrystalline films were grown on the (100)-oriented Si substrates. In addition, the films show strong ferromagnetic behavior

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