Tailoring the structural and magnetic property of nanocrystalline Mn x Zn 1-x Fe 2 O 4 synthesized by citrate route meth
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Tailoring the structural and magnetic property of nanocrystalline Mn x Zn 1-x Fe 2 O 4 synthesized by citrate route method D. K. Tiwari1, 4, S. E. Almanza-Morales2, L. M. Morales-Villagómez3, M.O. Alonso-Pérez4, Prakhar Sengar5, J. Estudillo-Ayala3, D. Homero Galván5 1 Cátedratico Conacyt-El Colegio de Michoacán, La Piedad, C. P. 59370, Michoacán, México. 2 Ingeniería en Biotecnología, Universidad Politécnica de Pénjamo, Pénjamo, Guanajuato, México. 3 División de Ingenierías, Universidad de Guanajuato, Salamanca, Guanajuato, México. 4 Laboratorio de Análisis y Diagnóstico del Patrimonio, El Colegio de Michoacán, La Piedad, C. P. 59370, Michoacán, México 5 Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, Baja California, México. Author for correspondence: [email protected]
Dhirendra
K.
Tiwari,
E-mail:
[email protected],
ABSTRACT Nanocrystalline Mn x Zn 1-x Fe 2 O 4 with the varying concentration of Mn (x= 0.25, 0.50) have been synthesized by citrate route method. The effect of annealing temperature on structural and magnetic properties of as-synthesized materials was studied. The X-ray diffraction (XRD) analysis revealed the improved crystallinity and purity of the samples at high temperature annealing. Also, the increase in the annealing temperature yielded nanocrystals with bigger crystallite size. The samples annealed at higher temperature were analyzed by TEM which showed the formation of irregular polycrystalline particles with average size in the range of 150180 nm. The magnetic measurements were taken using vibrating sample magnetometer and displayed the superparamagnetic behavior of the prepared materials. Also, the increase in magnetization was observed with Mn substitution. 1. INTRODUCTION The ferrites present the excellent magnetic and electric properties with application in various fields, like photocatalysis, magnetic drug delivery, road antennas, radio frequency circuits, high quality filters, medical imaging and sensors [1, 2]. These materials have drawn a major interest especially for their chemical stability, high electrical resistivity, mechanical hardness, and high frequency [3]. The properties of the ferrites in the nano-regime are much different from the bulk. Therefore, the attention in the field of magnetic materials has been diverted to their nanocrystallization in order to improve properties. Nowadays, the synthesis and characterization of new magnetic materials have a special interest, especially in the studies of nanocomposite materials with tailored electric and magnetic properties. The physical properties of ferrites depend on the method of synthesis, doping of cations in the host crystal structure, size and morphology of the particles. Ferrites can be synthesized by several methods including sol-gel [4, 5], micro-emulsion, co-precipitation [6], reverse micelle and hydrothermal method [7, 8, 9]. Furthermore, the substitution or incorporation of rare-earth
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