Magnetic properties and microstructure of La-substituted BaCr-ferrite powders

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• 作者：Yuping Wang ; Liangchao Li ; Hui Liu ; Haizhen Qiu ; Feng Xu
• 关键词：Combustion process ; Nanoparticles ; La-substituted ; Defects ; Magnetic properties ; Microstructure
• 刊名：Materials Letters
• 出版年：2008
• 出版时间：15 May 2008
• 年：2008
• 卷：62
• 期：14
• 页码：2060-2062
• 全文大小：476 K

文摘

A combustion process was used to synthesize crystalline powders of La-substituted barium chromium hexaferrites Ba_{1 − x}La_xFe_11.5Cr_0.5O₁₉ (x = 0–0.25). The structures, morphologies and ferromagnetic properties of La³⁺ substituted nanocomposites were characterized by powder X-ray diffractometer (XRD), transmission electron microscope (TEM) and vibrating sample magnetometer (VSM). XRD results showed that single-phase barium chromium ferrite powders was found at La content x ≤ 0.2. From the SEM, it was observed that the particles calcined at 1100 °C had a plate-like hexagonal shape. The results of magnetic mensuration revealed that both M_S and H_C of barium hexaferrite increased up to x = 0.1, and then decreased with the increasing of La content.