Effect of Zn doping on structural, magnetic and dielectric properties of LaFeO₃ synthesized through sol-gel auto-combustion process

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• 作者：Irshad Bhat ; Shahid Husain ; Wasi Khan ; S.I. Patil
• 关键词：A. Oxides ; B. Sol&ndash ; gel chemistry ; C. X-ray diffraction ; D. Dielectric properties
• 刊名：Materials Research Bulletin
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：48
• 期：11
• 页码：4506-4512
• 全文大小：2639 K

文摘

We have studied the structural and dielectric properties of nano-crystalline LaFe_1?m>xm>Zn_m>xm>O₃ (0 ¡Ü m>xm> ¡Ü 0.3) pervoskite samples synthesized through sol-gel auto-combustion technique. X-ray diffraction and FTIR spectroscopy are used to confirm the single phase characteristics. Microstructural features are investigated using scanning electron microscope and compositional analysis is performed through energy dispersive spectroscopy. The average grain sizes, calculated from the Scherrer formula, lie in the range below 30 nm. The hysteresis (M-H) curves display a weak magnetic order and a shift in the hysteresis loops. Dielectric response has been discussed, in the framework of ¡°universal dielectric response¡± model. The value of dielectric constant (m>?m>¡ä) increases drastically on Zn doping. The dielectric loss factor (m>?¡åm>) shows Debye like dipolar relaxation behavior. The observed peaks in loss factor (m>?¡åm>) are attributed to the fact that a strong correlation between the conduction mechanism and the dielectric behavior exists in ferrites.