Synthesis, characterization and studies of various structural, physical, magnetic, electrical and dielectric parameters for La_1?xDy_xNi_1?yMn_yO

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• 作者：Azhar Mahmood ; Mubashar Nadeem ; Bushra Bashir ; Imran Shakir ; Muhammad Naeem Ashiq ; Muhammad Ishaq ; Abdul Jabbar ; Riffat Parveen ; Muhammad Shahid ; Muhammad Farooq Warsi
• 关键词：Perovskite ; Nanoparticle ; Electrical resistivity ; Dielectric property ; Magnetic property ; Microwave device
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2013
• 出版时间：December, 2013
• 年：2013
• 卷：348
• 期：Complete
• 页码：82-87
• 全文大小：1472 K

文摘

We report the structural, physical, dielectric and magnetic properties of of La_1?xDy_xNi_1?yMn_yO₃ (x, y=0-1.0) nanoparticles synthesized by the micro-emulsion method. After characterization of the nanoparticles by thermogravimetric analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy and Fourier-transformed infrared spectroscopy, various electrical, dielectric and magnetic parameters were investigated. The diameter of the nanoparticles was found in the range of 30-60 nm as determined by XRD and SEM. Most of the samples exhibited the paramagnetic behavior apart from LaNiO₃, that exhibited the weak ferromagnetic behavior. The dc-electrical resistivity was also investigated at variable temperature (300-680 K). The maximum electrical resistivity (39.58¡Á10⁸ ¦¸ cm) was exhibited by La_1?xDy_xNi_1?yMn_yO₃ (x, y=0), that was decreased to 0.45¡Á10⁸ ¦¸ cm as the Dy and Mn contents were increased. The dielectric parameters were measured at room temperature in the range of 100 Hz to 5.0 MHz. The maximum dielectric parameters (¦Å¡ä=7.67¡Á10², tan¦Ä=2.96¡Á10³, ¦Å¡å=2.27) were observed for La_1?xDy_xNi_1?yMn_yO₃ (x, y=0) nanoparticles.